Convert.ToString メソッド

定義

指定した値を等価の文字列形式に変換します。

オーバーロード

ToString(Int32, Int32)

32 ビット符号付き整数の値を、指定した基数での等価の文字列形式に変換します。

ToString(Decimal, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 10 進数値を等価の文字列形式に変換します。

ToString(Double, IFormatProvider)

指定した倍精度浮動小数点数値を等価の文字列形表記に変換します。

ToString(Int16, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 16 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Int16, Int32)

16 ビット符号付き整数の値を、指定した基数での等価の文字列形式に変換します。

ToString(Int32, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 32 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Int64, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 64 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(UInt64)

指定した 64 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(Object, IFormatProvider)

指定したカルチャ固有の書式情報を使用して、指定したオブジェクトの値を等価の文字列形式に変換します。

ToString(SByte, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 8 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Single, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した単精度浮動小数点数値を等価の文字列形式に変換します。

ToString(String, IFormatProvider)

指定した文字列インスタンスを返します。実際の変換は実行されません。

ToString(UInt16, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 16 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(UInt32, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 32 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(UInt64, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 64 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(DateTime, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した DateTime の値を等価の文字列形式に変換します。

ToString(Int64, Int32)

64 ビット符号付き整数の値を、指定した基数でそれと等しい文字列形式に変換します。

ToString(Char, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した Unicode 文字の値を等価の文字列形式に変換します。

ToString(UInt32)

指定した 32 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(Byte, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 8 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(Boolean)

指定したブール値を、それと等しい文字列形式に変換します。

ToString(Byte)

指定した 8 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(Char)

指定した Unicode 文字の値を等価の文字列形式に変換します。

ToString(DateTime)

指定した DateTime の値を等価の文字列形式に変換します。

ToString(Double)

指定した倍精度浮動小数点数値を等価の文字列形表記に変換します。

ToString(Int16)

指定した 16 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Int32)

指定した 32 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Decimal)

指定した 10 進数値を、それと等しい文字列形式に変換します。

ToString(Object)

指定したオブジェクトの値を等価の文字列表記に変換します。

ToString(SByte)

指定した 8 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Single)

指定した単精度浮動小数点数値を等価の文字列形式に変換します。

ToString(String)

指定した文字列インスタンスを返します。実際の変換は実行されません。

ToString(UInt16)

指定した 16 ビット符号なし整数の値を等価の文字列形式に変換します。

ToString(Byte, Int32)

8 ビット符号なし整数値を、指定した基数で表される等価な文字列形式に変換します。

ToString(Boolean, IFormatProvider)

指定したブール値を、それと等しい文字列形式に変換します。

ToString(Int64)

指定した 64 ビット符号付き整数の値を等価の文字列形式に変換します。

ToString(Int32, Int32)

32 ビット符号付き整数の値を、指定した基数での等価の文字列形式に変換します。

public:
 static System::String ^ ToString(int value, int toBase);
public static string ToString (int value, int toBase);
static member ToString : int * int -> string
Public Shared Function ToString (value As Integer, toBase As Integer) As String

パラメーター

value
Int32

変換する 32 ビット符号付き整数。

toBase
Int32

戻り値の基数。これは 2、8、10、16 である必要があります。

戻り値

String

基数 valuetoBase の文字列形式。

例外

toBase が 2、8、10、16 のどれでもありません。

次の例では、整数配列内の各要素を等価のバイナリ、16 進数、10 進数、および 16 進数の文字列表現に変換します。

int[] bases = { 2, 8, 10, 16};
int[] numbers = { Int32.MinValue, -19327543, -13621, -18, 12,
                             19142, Int32.MaxValue };

foreach (int baseValue in bases)
{
   Console.WriteLine("Base {0} conversion:", baseValue);
   foreach (int number in numbers)
   {
      Console.WriteLine("   {0,-15}  -->  0x{1}",
                        number, Convert.ToString(number, baseValue));
   }
}
// The example displays the following output:
//    Base 2 conversion:
//       -2147483648      -->  0x10000000000000000000000000000000
//       -19327543        -->  0x11111110110110010001010111001001
//       -13621           -->  0x11111111111111111100101011001011
//       -18              -->  0x11111111111111111111111111101110
//       12               -->  0x1100
//       19142            -->  0x100101011000110
//       2147483647       -->  0x1111111111111111111111111111111
//    Base 8 conversion:
//       -2147483648      -->  0x20000000000
//       -19327543        -->  0x37666212711
//       -13621           -->  0x37777745313
//       -18              -->  0x37777777756
//       12               -->  0x14
//       19142            -->  0x45306
//       2147483647       -->  0x17777777777
//    Base 10 conversion:
//       -2147483648      -->  0x-2147483648
//       -19327543        -->  0x-19327543
//       -13621           -->  0x-13621
//       -18              -->  0x-18
//       12               -->  0x12
//       19142            -->  0x19142
//       2147483647       -->  0x2147483647
//    Base 16 conversion:
//       -2147483648      -->  0x80000000
//       -19327543        -->  0xfed915c9
//       -13621           -->  0xffffcacb
//       -18              -->  0xffffffee
//       12               -->  0xc
//       19142            -->  0x4ac6
//       2147483647       -->  0x7fffffff
let bases = [| 2; 8; 10; 16 |]
let numbers = 
    [| Int32.MinValue; -19327543; -13621; -18; 12; 19142; Int32.MaxValue |]

for baseValue in bases do
    printfn $"Base {baseValue} conversion:"
    for number in numbers do
        printfn $"   {number,-15}  -->  0x{Convert.ToString(number, baseValue)}"
// The example displays the following output:
//    Base 2 conversion:
//       -2147483648      -->  0x10000000000000000000000000000000
//       -19327543        -->  0x11111110110110010001010111001001
//       -13621           -->  0x11111111111111111100101011001011
//       -18              -->  0x11111111111111111111111111101110
//       12               -->  0x1100
//       19142            -->  0x100101011000110
//       2147483647       -->  0x1111111111111111111111111111111
//    Base 8 conversion:
//       -2147483648      -->  0x20000000000
//       -19327543        -->  0x37666212711
//       -13621           -->  0x37777745313
//       -18              -->  0x37777777756
//       12               -->  0x14
//       19142            -->  0x45306
//       2147483647       -->  0x17777777777
//    Base 10 conversion:
//       -2147483648      -->  0x-2147483648
//       -19327543        -->  0x-19327543
//       -13621           -->  0x-13621
//       -18              -->  0x-18
//       12               -->  0x12
//       19142            -->  0x19142
//       2147483647       -->  0x2147483647
//    Base 16 conversion:
//       -2147483648      -->  0x80000000
//       -19327543        -->  0xfed915c9
//       -13621           -->  0xffffcacb
//       -18              -->  0xffffffee
//       12               -->  0xc
//       19142            -->  0x4ac6
//       2147483647       -->  0x7fffffff
Dim bases() As Integer = { 2, 8, 10, 16}
Dim numbers() As Integer = { Int32.MinValue, -19327543, -13621, -18, 12, _
                             19142, Int32.MaxValue }

For Each base As Integer In bases
   Console.WriteLine("Base {0} conversion:", base)
   For Each number As Integer In numbers
      Console.WriteLine("   {0,-15}  -->  0x{1}", _
                        number, Convert.ToString(number, base))
   Next
Next
' The example displays the following output:
'    Base 2 conversion:
'       -2147483648      -->  0x10000000000000000000000000000000
'       -19327543        -->  0x11111110110110010001010111001001
'       -13621           -->  0x11111111111111111100101011001011
'       -18              -->  0x11111111111111111111111111101110
'       12               -->  0x1100
'       19142            -->  0x100101011000110
'       2147483647       -->  0x1111111111111111111111111111111
'    Base 8 conversion:
'       -2147483648      -->  0x20000000000
'       -19327543        -->  0x37666212711
'       -13621           -->  0x37777745313
'       -18              -->  0x37777777756
'       12               -->  0x14
'       19142            -->  0x45306
'       2147483647       -->  0x17777777777
'    Base 10 conversion:
'       -2147483648      -->  0x-2147483648
'       -19327543        -->  0x-19327543
'       -13621           -->  0x-13621
'       -18              -->  0x-18
'       12               -->  0x12
'       19142            -->  0x19142
'       2147483647       -->  0x2147483647
'    Base 16 conversion:
'       -2147483648      -->  0x80000000
'       -19327543        -->  0xfed915c9
'       -13621           -->  0xffffcacb
'       -18              -->  0xffffffee
'       12               -->  0xc
'       19142            -->  0x4ac6
'       2147483647       -->  0x7fffffff
let bases = [2; 8; 10; 16]
let numbers = [ Int32.MinValue; -19327543; -13621; -18; 12; 19142; Int32.MaxValue ]

for baseValue in bases do
    printfn "Base %i conversion:" baseValue
    for number in numbers do
        printfn "   % -15i  -->  0x%s" number (Convert.ToString (number, baseValue))
// The example displays the following output:
//     Base 2 conversion:
//        -2147483648      -->  0x10000000000000000000000000000000
//        -19327543        -->  0x11111110110110010001010111001001
//        -13621           -->  0x11111111111111111100101011001011
//        -18              -->  0x11111111111111111111111111101110
//         12              -->  0x1100
//         19142           -->  0x100101011000110
//         2147483647      -->  0x1111111111111111111111111111111
//     Base 8 conversion:
//        -2147483648      -->  0x20000000000
//        -19327543        -->  0x37666212711
//        -13621           -->  0x37777745313
//        -18              -->  0x37777777756
//         12              -->  0x14
//         19142           -->  0x45306
//         2147483647      -->  0x17777777777
//     Base 10 conversion:
//        -2147483648      -->  0x-2147483648
//        -19327543        -->  0x-19327543
//        -13621           -->  0x-13621
//        -18              -->  0x-18
//         12              -->  0x12
//         19142           -->  0x19142
//         2147483647      -->  0x2147483647
//     Base 16 conversion:
//        -2147483648      -->  0x80000000
//        -19327543        -->  0xfed915c9
//        -13621           -->  0xffffcacb
//        -18              -->  0xffffffee
//         12              -->  0xc
//         19142           -->  0x4ac6
//         2147483647      -->  0x7fffffff

注釈

正の値が toBase 2、8、または 16 の場合value、返される文字列は符号と大きさの表現を使用します。 負の値で toBase 2、8、または 16 の場合value、返される文字列は 2 の補数表現を使用します。 つまり、最上位バイト (ビット 31) の上位ビットが符号ビットとして解釈されます。 後で ToString(Int32, Int32) 数値に変換される文字列を作成するためにメソッドを呼び出す場合は、同様の数値表現を想定する対応するメソッドを呼び出して変換を実行する必要があります。 このような方法には、以下がInt32.Parse(String, NumberStyles)含まれますConvert.ToInt32(String, Int32)

適用対象

ToString(Decimal, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 10 進数値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::Decimal value, IFormatProvider ^ provider);
public static string ToString (decimal value, IFormatProvider provider);
public static string ToString (decimal value, IFormatProvider? provider);
static member ToString : decimal * IFormatProvider -> string
Public Shared Function ToString (value As Decimal, provider As IFormatProvider) As String

パラメーター

value
Decimal

変換する 10 進数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、値の配列内の Decimal 各要素を、4 つの異なるカルチャの同等の文字列表現に変換します。

// Define an array of numbers to display.
decimal[] numbers = { 1734231911290.16m, -17394.32921m,
                      3193.23m, 98012368321.684m };
// Define the culture names used to display them.
string[] cultureNames = { "en-US", "fr-FR", "ja-JP", "ru-RU" };

foreach (decimal number in numbers)
{
   Console.WriteLine("{0}:", Convert.ToString(number,
                             System.Globalization.CultureInfo.InvariantCulture));
   foreach (string cultureName in cultureNames)
   {
      System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo(cultureName);
      Console.WriteLine("   {0}: {1,20}",
                        culture.Name, Convert.ToString(number, culture));
   }
   Console.WriteLine();
}
// The example displays the following output:
//    1734231911290.16:
//       en-US:     1734231911290.16
//       fr-FR:     1734231911290,16
//       ja-JP:     1734231911290.16
//       ru-RU:     1734231911290,16
//
//    -17394.32921:
//       en-US:         -17394.32921
//       fr-FR:         -17394,32921
//       ja-JP:         -17394.32921
//       ru-RU:         -17394,32921
//
//    3193.23:
//       en-US:              3193.23
//       fr-FR:              3193,23
//       ja-JP:              3193.23
//       ru-RU:              3193,23
//
//    98012368321.684:
//       en-US:      98012368321.684
//       fr-FR:      98012368321,684
//       ja-JP:      98012368321.684
//       ru-RU:      98012368321,684
// Define an array of numbers to display.
let numbers = 
    [| 1734231911290.16m; -17394.32921m; 3193.23m; 98012368321.684m |]
// Define the culture names used to display them.
let cultureNames = [| "en-US"; "fr-FR"; "ja-JP"; "ru-RU" |]

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture)}:"
    for cultureName in cultureNames do
        let culture = CultureInfo cultureName
        printfn $"   {culture.Name}: {Convert.ToString(number, culture),20}"
    printfn ""
// The example displays the following output:
//    1734231911290.16:
//       en-US:     1734231911290.16
//       fr-FR:     1734231911290,16
//       ja-JP:     1734231911290.16
//       ru-RU:     1734231911290,16
//
//    -17394.32921:
//       en-US:         -17394.32921
//       fr-FR:         -17394,32921
//       ja-JP:         -17394.32921
//       ru-RU:         -17394,32921
//
//    3193.23:
//       en-US:              3193.23
//       fr-FR:              3193,23
//       ja-JP:              3193.23
//       ru-RU:              3193,23
//
//    98012368321.684:
//       en-US:      98012368321.684
//       fr-FR:      98012368321,684
//       ja-JP:      98012368321.684
//       ru-RU:      98012368321,684
' Define an array of numbers to display.
Dim numbers() As Decimal = { 1734231911290.16d, -17394.32921d, _
                             3193.23d, 98012368321.684d }
' Define the culture names used to display them.
Dim cultureNames() As String = { "en-US", "fr-FR", "ja-JP", "ru-RU" }

For Each number As Decimal In numbers
   Console.WriteLine("{0}:", Convert.ToString(number, _
                             System.Globalization.CultureInfo.InvariantCulture))
   For Each cultureName As String In cultureNames
      Dim culture As New System.Globalization.CultureInfo(cultureName)
      Console.WriteLine("   {0}: {1,20}", _
                        culture.Name, Convert.ToString(number, culture))
   Next
   Console.WriteLine()
Next   
' The example displays the following output:
'    1734231911290.16:
'       en-US:     1734231911290.16
'       fr-FR:     1734231911290,16
'       ja-JP:     1734231911290.16
'       ru-RU:     1734231911290,16
'    
'    -17394.32921:
'       en-US:         -17394.32921
'       fr-FR:         -17394,32921
'       ja-JP:         -17394.32921
'       ru-RU:         -17394,32921
'    
'    3193.23:
'       en-US:              3193.23
'       fr-FR:              3193,23
'       ja-JP:              3193.23
'       ru-RU:              3193,23
'    
'    98012368321.684:
'       en-US:      98012368321.684
'       fr-FR:      98012368321,684
'       ja-JP:      98012368321.684
'       ru-RU:      98012368321,684

注釈

この実装は次と Decimal.ToString(IFormatProvider)同じです。

適用対象

ToString(Double, IFormatProvider)

指定した倍精度浮動小数点数値を等価の文字列形表記に変換します。

public:
 static System::String ^ ToString(double value, IFormatProvider ^ provider);
public static string ToString (double value, IFormatProvider provider);
public static string ToString (double value, IFormatProvider? provider);
static member ToString : double * IFormatProvider -> string
Public Shared Function ToString (value As Double, provider As IFormatProvider) As String

パラメーター

value
Double

変換する倍精度浮動小数点数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、値の配列内の Double 各要素を、4 つの異なるカルチャの同等の文字列表現に変換します。

// Define an array of numbers to display.
double[] numbers = { -1.5345e16, -123.4321, 19092.123, 1.1734231911290e16 };
// Define the culture names used to display them.
string[] cultureNames = { "en-US", "fr-FR", "ja-JP", "ru-RU" };

foreach (double number in numbers)
{
   Console.WriteLine("{0}:", Convert.ToString(number,
                             System.Globalization.CultureInfo.InvariantCulture));
   foreach (string cultureName in cultureNames)
   {
      System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo(cultureName);
      Console.WriteLine("   {0}: {1,20}",
                        culture.Name, Convert.ToString(number, culture));
   }
   Console.WriteLine();
}
// The example displays the following output:
//    -1.5345E+16:
//       en-US:          -1.5345E+16
//       fr-FR:          -1,5345E+16
//       ja-JP:          -1.5345E+16
//       ru-RU:          -1,5345E+16
//
//    -123.4321:
//       en-US:            -123.4321
//       fr-FR:            -123,4321
//       ja-JP:            -123.4321
//       ru-RU:            -123,4321
//
//    19092.123:
//       en-US:            19092.123
//       fr-FR:            19092,123
//       ja-JP:            19092.123
//       ru-RU:            19092,123
//
//    1.173423191129E+16:
//       en-US:   1.173423191129E+16
//       fr-FR:   1,173423191129E+16
//       ja-JP:   1.173423191129E+16
//       ru-RU:   1,173423191129E+16
// Define an array of numbers to display.
let numbers = [| -1.5345e16; -123.4321; 19092.123; 1.1734231911290e16 |]
// Define the culture names used to display them.
let cultureNames = [| "en-US"; "fr-FR"; "ja-JP"; "ru-RU" |]

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture)}:"
    for cultureName in cultureNames do
        let culture = CultureInfo cultureName
        printfn "   {culture.Name}: {Convert.ToString(number, culture),20}"
    printfn ""
// The example displays the following output:
//    -1.5345E+16:
//       en-US:          -1.5345E+16
//       fr-FR:          -1,5345E+16
//       ja-JP:          -1.5345E+16
//       ru-RU:          -1,5345E+16
//
//    -123.4321:
//       en-US:            -123.4321
//       fr-FR:            -123,4321
//       ja-JP:            -123.4321
//       ru-RU:            -123,4321
//
//    19092.123:
//       en-US:            19092.123
//       fr-FR:            19092,123
//       ja-JP:            19092.123
//       ru-RU:            19092,123
//
//    1.173423191129E+16:
//       en-US:   1.173423191129E+16
//       fr-FR:   1,173423191129E+16
//       ja-JP:   1.173423191129E+16
//       ru-RU:   1,173423191129E+16
' Define an array of numbers to display.
Dim numbers() As Double = { -1.5345e16, -123.4321, 19092.123, _
                            1.1734231911290e16 }
' Define the culture names used to display them.
Dim cultureNames() As String = { "en-US", "fr-FR", "ja-JP", "ru-RU" }

For Each number As Double In numbers
   Console.WriteLine("{0}:", Convert.ToString(number, _
                             System.Globalization.CultureInfo.InvariantCulture))
   For Each cultureName As String In cultureNames
      Dim culture As New System.Globalization.CultureInfo(cultureName)
      Console.WriteLine("   {0}: {1,20}", _
                        culture.Name, Convert.ToString(number, culture))
   Next
   Console.WriteLine()
Next   
' The example displays the following output:
'    -1.5345E+16:
'       en-US:          -1.5345E+16
'       fr-FR:          -1,5345E+16
'       ja-JP:          -1.5345E+16
'       ru-RU:          -1,5345E+16
'    
'    -123.4321:
'       en-US:            -123.4321
'       fr-FR:            -123,4321
'       ja-JP:            -123.4321
'       ru-RU:            -123,4321
'    
'    19092.123:
'       en-US:            19092.123
'       fr-FR:            19092,123
'       ja-JP:            19092.123
'       ru-RU:            19092,123
'    
'    1.173423191129E+16:
'       en-US:   1.173423191129E+16
'       fr-FR:   1,173423191129E+16
'       ja-JP:   1.173423191129E+16
'       ru-RU:   1,173423191129E+16

注釈

この実装は次と同じです。 Double.ToString(IFormatProvider)

適用対象

ToString(Int16, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 16 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(short value, IFormatProvider ^ provider);
public static string ToString (short value, IFormatProvider provider);
public static string ToString (short value, IFormatProvider? provider);
static member ToString : int16 * IFormatProvider -> string
Public Shared Function ToString (value As Short, provider As IFormatProvider) As String

パラメーター

value
Int16

変換する 16 ビット符号付き整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを ToString(Int16, IFormatProvider) 呼び出して、16 ビット整数の配列内の各要素を等価の文字列表現に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトが使用されます。

short[] numbers = { Int16.MinValue, Int16.MaxValue};
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";

foreach (short number in numbers)
   Console.WriteLine("{0,-8}  -->  {1,8}",
                     Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture),
                     Convert.ToString(number, nfi));
// The example displays the following output:
//       -32768    -->    ~32768
//       32767     -->     32767
let numbers = [| Int16.MinValue; Int16.MaxValue |]
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture),-8}  -->  {Convert.ToString(number, nfi),8}"
// The example displays the following output:
//       -32768    -->    ~32768
//       32767     -->     32767
Dim numbers() As Short = { Int16.MinValue, Int16.MaxValue}
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"

For Each number As Short In numbers
   Console.WriteLine("{0,-8}  -->  {1,8}", _
                     Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture), _
                     Convert.ToString(number, nfi))
Next
' The example displays the following output:
'       -32768    -->    ~32768
'       32767     -->     32767

注釈

この実装は次と Int16.ToString(IFormatProvider)同じです。

適用対象

ToString(Int16, Int32)

16 ビット符号付き整数の値を、指定した基数での等価の文字列形式に変換します。

public:
 static System::String ^ ToString(short value, int toBase);
public static string ToString (short value, int toBase);
static member ToString : int16 * int -> string
Public Shared Function ToString (value As Short, toBase As Integer) As String

パラメーター

value
Int16

変換する 16 ビット符号付き整数。

toBase
Int32

戻り値の基数。これは 2、8、10、16 である必要があります。

戻り値

String

基数 valuetoBase の文字列形式。

例外

toBase が 2、8、10、16 のどれでもありません。

次の例では、16 ビット符号付き整数の配列内の各要素を、等価のバイナリ、8 進数、10 進数、および 16 進数の文字列表現に変換します。

int[] bases = { 2, 8, 10, 16};
short[] numbers = { Int16.MinValue, -13621, -18, 12, 19142, Int16.MaxValue };

foreach (int baseValue in bases)
{
   Console.WriteLine("Base {0} conversion:", baseValue);
   foreach (short number in numbers)
   {
      Console.WriteLine("   {0,-8}  -->  0x{1}",
                        number, Convert.ToString(number, baseValue));
   }
}
// The example displays the following output:
//       Base 2 conversion:
//          -32768    -->  0x1000000000000000
//          -13621    -->  0x1100101011001011
//          -18       -->  0x1111111111101110
//          12        -->  0x1100
//          19142     -->  0x100101011000110
//          32767     -->  0x111111111111111
//       Base 8 conversion:
//          -32768    -->  0x100000
//          -13621    -->  0x145313
//          -18       -->  0x177756
//          12        -->  0x14
//          19142     -->  0x45306
//          32767     -->  0x77777
//       Base 10 conversion:
//          -32768    -->  0x-32768
//          -13621    -->  0x-13621
//          -18       -->  0x-18
//          12        -->  0x12
//          19142     -->  0x19142
//          32767     -->  0x32767
//       Base 16 conversion:
//          -32768    -->  0x8000
//          -13621    -->  0xcacb
//          -18       -->  0xffee
//          12        -->  0xc
//          19142     -->  0x4ac6
//          32767     -->  0x7fff
let bases = [| 2; 8; 10; 16 |]
let numbers = [| Int16.MinValue; -13621s; -18s; 12s; 19142s; Int16.MaxValue |]

for baseValue in bases do
    printfn $"Base {baseValue} conversion:"
    for number in numbers do
        printfn $"   {number,-8}  -->  0x{Convert.ToString(number, baseValue)}"
// The example displays the following output:
//       Base 2 conversion:
//          -32768    -->  0x1000000000000000
//          -13621    -->  0x1100101011001011
//          -18       -->  0x1111111111101110
//          12        -->  0x1100
//          19142     -->  0x100101011000110
//          32767     -->  0x111111111111111
//       Base 8 conversion:
//          -32768    -->  0x100000
//          -13621    -->  0x145313
//          -18       -->  0x177756
//          12        -->  0x14
//          19142     -->  0x45306
//          32767     -->  0x77777
//       Base 10 conversion:
//          -32768    -->  0x-32768
//          -13621    -->  0x-13621
//          -18       -->  0x-18
//          12        -->  0x12
//          19142     -->  0x19142
//          32767     -->  0x32767
//       Base 16 conversion:
//          -32768    -->  0x8000
//          -13621    -->  0xcacb
//          -18       -->  0xffee
//          12        -->  0xc
//          19142     -->  0x4ac6
//          32767     -->  0x7fff
Dim bases() As Integer = { 2, 8, 10, 16}
Dim numbers() As Short = { Int16.MinValue, -13621, -18, 12, 19142, _
                           Int16.MaxValue }

For Each base As Integer In bases
   Console.WriteLine("Base {0} conversion:", base)
   For Each number As Short In numbers
      Console.WriteLine("   {0,-8}  -->  0x{1}", _
                        number, Convert.ToString(number, base))
   Next
Next
' The example displays the following output:
'       Base 2 conversion:
'          -32768    -->  0x1000000000000000
'          -13621    -->  0x1100101011001011
'          -18       -->  0x1111111111101110
'          12        -->  0x1100
'          19142     -->  0x100101011000110
'          32767     -->  0x111111111111111
'       Base 8 conversion:
'          -32768    -->  0x100000
'          -13621    -->  0x145313
'          -18       -->  0x177756
'          12        -->  0x14
'          19142     -->  0x45306
'          32767     -->  0x77777
'       Base 10 conversion:
'          -32768    -->  0x-32768
'          -13621    -->  0x-13621
'          -18       -->  0x-18
'          12        -->  0x12
'          19142     -->  0x19142
'          32767     -->  0x32767
'       Base 16 conversion:
'          -32768    -->  0x8000
'          -13621    -->  0xcacb
'          -18       -->  0xffee
'          12        -->  0xc
'          19142     -->  0x4ac6
'          32767     -->  0x7fff
let bases = [2; 8; 10; 16]
let numbers = [ Int16.MinValue; -13621s; -18s; 12s; 19142s; Int16.MaxValue ]

for baseValue in bases do
    printfn "Base %i conversion:" baseValue
    for number in numbers do
        printfn "   % -8i  -->  0x%s" number (Convert.ToString (number, baseValue))
// The example displays the following output:
//     Base 2 conversion:
//        -32768    -->  0x1000000000000000
//        -13621    -->  0x1100101011001011
//        -18       -->  0x1111111111101110
//         12       -->  0x1100
//         19142    -->  0x100101011000110
//         32767    -->  0x111111111111111
//     Base 8 conversion:
//        -32768    -->  0x100000
//        -13621    -->  0x145313
//        -18       -->  0x177756
//         12       -->  0x14
//         19142    -->  0x45306
//         32767    -->  0x77777
//     Base 10 conversion:
//        -32768    -->  0x-32768
//        -13621    -->  0x-13621
//        -18       -->  0x-18
//         12       -->  0x12
//         19142    -->  0x19142
//         32767    -->  0x32767
//     Base 16 conversion:
//        -32768    -->  0x8000
//        -13621    -->  0xcacb
//        -18       -->  0xffee
//         12       -->  0xc
//         19142    -->  0x4ac6
//         32767    -->  0x7fff

注釈

正の値が toBase 2、8、または 16 の場合value、返される文字列は符号と大きさの表現を使用します。 負の値で toBase 2、8、または 16 の場合value、返される文字列は 2 の補数表現を使用します。 つまり、上位バイト (ビット 15) の上位ビットが符号ビットとして解釈されます。 後で ToString(Int16, Int32) 数値に変換される文字列を作成するためにメソッドを呼び出す場合は、同様の数値表現を想定する対応するメソッドを呼び出して変換を実行する必要があります。 このような方法には、以下がInt16.Parse(String, NumberStyles)含まれますConvert.ToInt16(String, Int32)

適用対象

ToString(Int32, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 32 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(int value, IFormatProvider ^ provider);
public static string ToString (int value, IFormatProvider provider);
public static string ToString (int value, IFormatProvider? provider);
static member ToString : int * IFormatProvider -> string
Public Shared Function ToString (value As Integer, provider As IFormatProvider) As String

パラメーター

value
Int32

変換する 32 ビット符号付き整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを ToString(Int32, IFormatProvider) 呼び出して、整数の配列内の各要素を等価の文字列表現に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトが使用されます。

int[] numbers = { Int32.MinValue, Int32.MaxValue};
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";

foreach (int number in numbers)
   Console.WriteLine("{0,-12}  -->  {1,12}",
                     Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture),
                     Convert.ToString(number, nfi));
// The example displays the following output:
//       -2147483648  -->  ~2147483648
//       2147483647  -->  2147483647
let numbers = [| Int32.MinValue; Int32.MaxValue |]
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture),-12}  -->  {Convert.ToString(number, nfi),12}"
// The example displays the following output:
//       -2147483648  -->  ~2147483648
//       2147483647  -->  2147483647
Dim numbers() As Integer = { Int32.MinValue, Int32.MaxValue}
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"

For Each number As Integer In numbers
   Console.WriteLine("{0,-12}  -->  {1,12}", _
                     Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture), _
                     Convert.ToString(number, nfi))
Next
' The example displays the following output:
'       -2147483648  -->  ~2147483648
'       2147483647   -->  2147483647

注釈

この実装は次と Int32.ToString(IFormatProvider)同じです。

適用対象

ToString(Int64, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 64 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(long value, IFormatProvider ^ provider);
public static string ToString (long value, IFormatProvider provider);
public static string ToString (long value, IFormatProvider? provider);
static member ToString : int64 * IFormatProvider -> string
Public Shared Function ToString (value As Long, provider As IFormatProvider) As String

パラメーター

value
Int64

変換する 64 ビット符号付き整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを ToString(Int64, IFormatProvider) 呼び出して、長整数配列内の各要素を等価の文字列形式に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトが使用されます。

long[] numbers = { ((long) Int32.MinValue) * 2, ((long) Int32.MaxValue) * 2};
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";

foreach (long number in numbers)
   Console.WriteLine("{0,-12}  -->  {1,12}",
                     Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture),
                     Convert.ToString(number, nfi));
// The example displays the following output:
//       -4294967296  -->  ~4294967296
//       4294967294  -->  4294967294
let numbers = [| (int64 Int32.MinValue) * 2L; (int64 Int32.MaxValue) * 2L |]
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture),-12}  -->  {Convert.ToString(number, nfi),12}"
// The example displays the following output:
//       -4294967296  -->  ~4294967296
//       4294967294  -->  4294967294
Dim numbers() As Long = { CLng(Int32.MinValue) * 2, CLng(Int32.MaxValue) * 2 }
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"

For Each number As Long In numbers
   Console.WriteLine("{0,-12}  -->  {1,12}", _
                     Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture), _
                     Convert.ToString(number, nfi))
Next
' The example displays the following output:
'       -4294967296  -->  ~4294967296
'       4294967294   -->  4294967294

注釈

この実装は次と Int64.ToString(IFormatProvider)同じです。

適用対象

ToString(UInt64)

重要

この API は CLS 準拠ではありません。

指定した 64 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::UInt64 value);
[System.CLSCompliant(false)]
public static string ToString (ulong value);
[<System.CLSCompliant(false)>]
static member ToString : uint64 -> string
Public Shared Function ToString (value As ULong) As String

パラメーター

value
UInt64

変換する 64 ビット符号なし整数。

戻り値

String

value の文字列形式。

属性

次の例では、符号なし長整数配列内の各要素を等価の文字列形式に変換します。

ulong[] numbers = { UInt64.MinValue, 1031, 189045, UInt64.MaxValue };
string result;

foreach (ulong number in numbers)
{
   result = Convert.ToString(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the UInt64 value 0 to the String value 0.
//    Converted the UInt64 value 1031 to the String value 1031.
//    Converted the UInt64 value 189045 to the String value 189045.
//    Converted the UInt64 value 18446744073709551615 to the String value 18446744073709551615.
let numbers = [| UInt64.MinValue; 1031uL; 189045uL; UInt64.MaxValue |]

for number in numbers do
    let result = Convert.ToString number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the UInt64 value 0 to the String value 0.
//    Converted the UInt64 value 1031 to the String value 1031.
//    Converted the UInt64 value 189045 to the String value 189045.
//    Converted the UInt64 value 18446744073709551615 to the String value 18446744073709551615.
Dim numbers() As ULong = { UInt64.MinValue, 1031, 189045, UInt64.MaxValue }
Dim result As String

For Each number As ULong In numbers
   result = Convert.ToString(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the UInt64 value 0 to the String value 0.
'    Converted the UInt64 value 1031 to the String value 1031.
'    Converted the UInt64 value 189045 to the String value 189045.
'    Converted the UInt64 value 18446744073709551615 to the String value 18446744073709551615.

注釈

この実装は次と UInt64.ToString()同じです。

適用対象

ToString(Object, IFormatProvider)

指定したカルチャ固有の書式情報を使用して、指定したオブジェクトの値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::Object ^ value, IFormatProvider ^ provider);
public static string ToString (object value, IFormatProvider provider);
public static string? ToString (object? value, IFormatProvider? provider);
static member ToString : obj * IFormatProvider -> string
Public Shared Function ToString (value As Object, provider As IFormatProvider) As String

パラメーター

value
Object

変換する値を提供するオブジェクト、または null

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列表現。または valuenull という値を持つオブジェクトである場合は Emptyvaluenull の場合、メソッドは null を返します。

次の例では、メソッドを Temperature オーバーライドするがインターフェイスを Object.ToString 実装しないクラスを IConvertible 定義します。 この例では、メソッドを呼び出す Convert.ToString(Object, IFormatProvider) 方法を示します。次に、メソッドを Temperature.ToString 呼び出します。

using System;

public class Temperature
{
   private decimal m_Temp;

   public Temperature(decimal temperature)
   {
      this.m_Temp = temperature;
   }

   public decimal Celsius
   {
      get { return this.m_Temp; }
   }

   public decimal Kelvin
   {
      get { return this.m_Temp + 273.15m; }
   }

   public decimal Fahrenheit
   {
      get { return Math.Round((decimal) (this.m_Temp * 9 / 5 + 32), 2); }
   }

   public override string ToString()
   {
      return m_Temp.ToString("N2") + " °C";
   }
}

public class Example
{
   public static void Main()
   {
      Temperature cold = new Temperature(-40);
      Temperature freezing = new Temperature(0);
      Temperature boiling = new Temperature(100);

      Console.WriteLine(Convert.ToString(cold, null));
      Console.WriteLine(Convert.ToString(freezing, null));
      Console.WriteLine(Convert.ToString(boiling, null));
   }
}
// The example dosplays the following output:
//       -40.00 °C
//       0.00 °C
//       100.00 °C
open System

type Temperature(temperature: decimal) =
    member _.Celsius =
        temperature

    member _.Kelvin =
        temperature + 273.15m

    member _.Fahrenheit =
        Math.Round(temperature * 9m / 5m + 32m |> decimal, 2)

    override _.ToString() =
        temperature.ToString("N2") + " °C"

let cold = Temperature -40
let freezing = Temperature 0
let boiling = Temperature 100

printfn $"{Convert.ToString(cold, null)}"
printfn $"{Convert.ToString(freezing, null)}"
printfn $"{Convert.ToString(boiling, null)}"
// The example dosplays the following output:
//       -40.00 °C
//       0.00 °C
//       100.00 °C
Public Class Temperature 
   Private m_Temp As Decimal

   Public Sub New(temperature As Decimal)
      Me.m_Temp = temperature
   End Sub
   
   Public ReadOnly Property Celsius() As Decimal
      Get
         Return Me.m_Temp
      End Get   
   End Property
   
   Public ReadOnly Property Kelvin() As Decimal
      Get
         Return Me.m_Temp + 273.15d   
      End Get
   End Property
   
   Public ReadOnly Property Fahrenheit() As Decimal
      Get
         Return Math.Round(CDec(Me.m_Temp * 9 / 5 + 32), 2)
      End Get      
   End Property
   
   Public Overrides Function ToString() As String
      Return m_Temp.ToString("N2") & " °C"
   End Function
End Class

Module Example
   Public Sub Main()
      Dim cold As New Temperature(-40)
      Dim freezing As New Temperature(0)
      Dim boiling As New Temperature(100)
      
      Console.WriteLine(Convert.ToString(cold, Nothing))
      Console.WriteLine(Convert.ToString(freezing, Nothing))
      Console.WriteLine(Convert.ToString(boiling, Nothing))
   End Sub
End Module
' The example displays the following output:
'       -40.00 °C
'       0.00 °C
'       100.00 °C

次の例では、インターフェイスを Temperature 実装するが、インターフェイスを IFormattable 実装しないクラスを IConvertible 定義します。 その実装は IFormattable.ToString 、書式指定文字列に応じて、摂氏、華氏、またはケルビンの値を表 Temperature します。 この例では、クラスのTemperatureProvider実装でIFormattableTemperature使用されるランダムに生成された書式指定文字列を実装IFormatProviderして提供するクラスも定義します。

using System;

public class Temperature : IFormattable
{
   private decimal m_Temp;

   public Temperature(decimal temperature)
   {
      this.m_Temp = temperature;
   }

   public decimal Celsius
   { get { return this.m_Temp; } }

   public decimal Kelvin
   { get { return this.m_Temp + 273.15m; } }

   public decimal Fahrenheit
   {  get { return Math.Round(this.m_Temp * 9m / 5m + 32m, 2); } }

   public override String ToString()
   {
      return ToString("G", null);
   }

   public String ToString(String fmt, IFormatProvider provider)
   {
      TemperatureProvider formatter = null;
      if (provider != null)
         formatter = provider.GetFormat(typeof(TemperatureProvider))
                                       as TemperatureProvider;

      if (String.IsNullOrWhiteSpace(fmt)) {
         if (formatter != null)
            fmt = formatter.Format;
         else
            fmt = "G";
      }

      switch (fmt.ToUpper()) {
         case "G":
         case "C":
            return m_Temp.ToString("N2") + " °C";
         case "F":
            return Fahrenheit.ToString("N2") + " °F";
         case "K":
            return Kelvin.ToString("N2") + " K";
         default:
            throw new FormatException(String.Format("'{0}' is not a valid format specifier.", fmt));
      }
   }
}

public class TemperatureProvider : IFormatProvider
{
   private String[] fmtStrings = { "C", "G", "F", "K" };
   private Random rnd = new Random();

   public Object GetFormat(Type formatType)
   {
      return this;
   }

   public String Format
   { get { return fmtStrings[rnd.Next(0, fmtStrings.Length)]; } }
}

public class Example
{
   public static void Main()
   {
      Temperature cold = new Temperature (-40);
      Temperature freezing = new Temperature (0);
      Temperature boiling = new Temperature (100);

      TemperatureProvider tp = new TemperatureProvider();

      Console.WriteLine(Convert.ToString(cold, tp));
      Console.WriteLine(Convert.ToString(freezing, tp));
      Console.WriteLine(Convert.ToString(boiling, tp));
   }
}
// The example displays output like the following:
//       -40.00 °C
//       273.15 K
//       100.00 °C
open System

[<AllowNullLiteral>]
type TemperatureProvider() =
    let fmtStrings = [| "C"; "G"; "F"; "K" |]
    let rnd = Random()

    member _.Format =
        fmtStrings[rnd.Next(0, fmtStrings.Length)]

    interface IFormatProvider with
        member this.GetFormat(formatType: Type) =
            this

type Temperature(temperature: decimal) =
    member _.Celsius =
        temperature
    member _.Kelvin =
        temperature + 273.15m

    member _.Fahrenheit =
        Math.Round(temperature * 9m / 5m + 32m, 2)

    override this.ToString() =
        this.ToString("G", null)

    member this.ToString(fmt: string, provider: IFormatProvider) =
        let formatter =
            match provider with
            | null -> null
            | _ ->
                match provider.GetFormat typeof<TemperatureProvider> with
                | :? TemperatureProvider as x -> x
                | _ -> null 

        let fmt = 
            if String.IsNullOrWhiteSpace fmt then
                if formatter <> null then
                    formatter.Format
                else
                    "G"
            else fmt

        match fmt.ToUpper() with
        | "G"
        | "C" ->
            $"{temperature:N2} °C"
        | "F" ->
            $"{this.Fahrenheit:N2}  °F"
        | "K" ->
            $"{this.Kelvin:N2} K"
        | _ ->
            raise (FormatException $"'{fmt}' is not a valid format specifier.")

let cold = Temperature -40
let freezing = Temperature 0
let boiling = Temperature 100

let tp = TemperatureProvider()

printfn $"{Convert.ToString(cold, tp)}"
printfn $"{Convert.ToString(freezing, tp)}"
printfn $"{Convert.ToString(boiling, tp)}"
// The example displays output like the following:
//       -40.00 °C
//       273.15 K
//       100.00 °C
Public Class Temperature : Implements IFormattable 
   Private m_Temp As Decimal 

   Public Sub New(temperature As Decimal)
      Me.m_Temp = temperature
   End Sub 

   Public ReadOnly Property Celsius As Decimal 
      Get 
         Return Me.m_Temp
      End Get    
   End Property 

   Public ReadOnly Property Kelvin As Decimal 
      Get 
         Return Me.m_Temp + 273.15d   
      End Get 
   End Property 

   Public ReadOnly Property Fahrenheit As Decimal 
      Get 
         Return Math.Round(CDec(Me.m_Temp * 9 / 5 + 32), 2)
      End Get       
   End Property 

   Public Overrides Function ToString() As String 
      Return ToString("G", Nothing) 
   End Function 
   
   Public Overloads Function ToString(fmt As String, 
                                      provider As IFormatProvider) As String _
                             Implements IFormattable.ToString
      Dim formatter As TemperatureProvider = Nothing
      If provider IsNot Nothing Then formatter = TryCast(provider.GetFormat(GetType(TemperatureProvider)),
                                                         TemperatureProvider)

      If String.IsNullOrWhiteSpace(fmt) Then
         If formatter IsNot Nothing Then
            fmt = formatter.Format
         Else
            fmt = "G"
         End If
      End If

      Select Case fmt.ToUpper()
         Case "G", "C"
            Return m_Temp.ToString("N2") & " °C" 
         Case "F"
            Return Fahrenheit.ToString("N2") + " °F"
         Case "K"
            Return Kelvin.ToString("N2") + " K"
         Case Else
            Throw New FormatException(String.Format("'{0}' is not a valid format specifier.", fmt))
      End Select
   End Function                             
End Class 

Public Class TemperatureProvider : Implements IFormatProvider
   Private fmtStrings() As String = { "C", "G", "F", "K" }
   Private rnd As New Random()
   
   Public Function GetFormat(formatType As Type) As Object _
                   Implements IFormatProvider.GetFormat 
      Return Me 
   End Function
   
   Public ReadOnly Property Format As String
      Get
         Return fmtStrings(rnd.Next(0, fmtStrings.Length))
      End Get
   End Property
End Class

Module Example
   Public Sub Main()
      Dim cold As New Temperature(-40)
      Dim freezing As New Temperature(0)
      Dim boiling As New Temperature(100)

      Dim tp As New TemperatureProvider()
      
      Console.WriteLine(Convert.ToString(cold, tp))
      Console.WriteLine(Convert.ToString(freezing, tp))
      Console.WriteLine(Convert.ToString(boiling, tp))
   End Sub 
End Module 
' The example displays output like the following:
'       -40.00 °C
'       273.15 K
'       100.00 °C

注釈

パラメーターがインターフェイスをvalue実装するIConvertible場合、メソッドIConvertible.ToString(IFormatProvider)valueは . それ以外の場合、パラメーターが value インターフェイスを実装する IFormattable 場合、メソッドはその実装を IFormattable.ToString(String, IFormatProvider) 呼び出します。 どちらのインターフェイスも実装していない場合value、メソッドはパラメーターのToString()メソッドをvalue呼び出しprovider、パラメーターは無視されます。

providerパラメーターがまたはIFormattableインターフェイスを実装するvalue場合は、パラメーターがIConvertible使用されます。 このパラメーターの provider 最も一般的な用途は、変換に使用されるカルチャ固有の value情報を指定することです。 たとえば、パラメーターが負の value 10 進数の場合、パラメーターは負 provider 符号と小数点区切り記号に使用される表記に関するカルチャ固有の情報を提供できます。 次のセクションの 2 番目の例は、カルチャに依存する書式設定情報を提供しない形式プロバイダーを示しています。

適用対象

ToString(SByte, IFormatProvider)

重要

この API は CLS 準拠ではありません。

指定したカルチャに固有の書式情報を使用して、指定した 8 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::SByte value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static string ToString (sbyte value, IFormatProvider provider);
[System.CLSCompliant(false)]
public static string ToString (sbyte value, IFormatProvider? provider);
[<System.CLSCompliant(false)>]
static member ToString : sbyte * IFormatProvider -> string
Public Shared Function ToString (value As SByte, provider As IFormatProvider) As String

パラメーター

value
SByte

変換する 8 ビット符号付き整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

属性

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを Convert.ToString(SByte, IFormatProvider) 呼び出して、符号付きバイト配列内の各要素を等価の文字列形式に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトが使用されます。

sbyte[] numbers = { SByte.MinValue, -12, 17, SByte.MaxValue};
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";
foreach (sbyte number in numbers)
   Console.WriteLine(Convert.ToString(number, nfi));
// The example displays the following output:
//       ~128
//       ~12
//       17
//       127
let numbers = [| SByte.MinValue; -12y; 17y; SByte.MaxValue |]
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"
for number in numbers do
    printfn $"{Convert.ToString(number, nfi)}"
// The example displays the following output:
//       ~128
//       ~12
//       17
//       127
Dim numbers() As SByte = { SByte.MinValue, -12, 17, SByte.MaxValue}
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"
For Each number As SByte In numbers
   Console.WriteLine(Convert.ToString(number, nfi))
Next
' The example displays the following output:
'       ~128
'       ~12
'       17
'       127

注釈

この実装は次と SByte.ToString(IFormatProvider)同じです。

適用対象

ToString(Single, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した単精度浮動小数点数値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(float value, IFormatProvider ^ provider);
public static string ToString (float value, IFormatProvider provider);
public static string ToString (float value, IFormatProvider? provider);
static member ToString : single * IFormatProvider -> string
Public Shared Function ToString (value As Single, provider As IFormatProvider) As String

パラメーター

value
Single

変換する単精度浮動小数点数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、値の配列内の Single 各要素を、4 つの異なるカルチャの同等の文字列表現に変換します。

// Define an array of numbers to display.
float[] numbers = { -1.5345e16f, -123.4321f, 19092.123f, 1.1734231911290e16f };
// Define the culture names used to display them.
string[] cultureNames = { "en-US", "fr-FR", "ja-JP", "ru-RU" };

foreach (float number in numbers)
{
   Console.WriteLine("{0}:", Convert.ToString(number,
                             System.Globalization.CultureInfo.InvariantCulture));
   foreach (string cultureName in cultureNames)
   {
      System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo(cultureName);
      Console.WriteLine("   {0}: {1,20}",
                        culture.Name, Convert.ToString(number, culture));
   }
   Console.WriteLine();
}
// The example displays the following output:
//    -1.5345E+16:
//       en-US:          -1.5345E+16
//       fr-FR:          -1,5345E+16
//       ja-JP:          -1.5345E+16
//       ru-RU:          -1,5345E+16
//
//    -123.4321:
//       en-US:            -123.4321
//       fr-FR:            -123,4321
//       ja-JP:            -123.4321
//       ru-RU:            -123,4321
//
//    19092.123:
//       en-US:            19092.123
//       fr-FR:            19092,123
//       ja-JP:            19092.123
//       ru-RU:            19092,123
//
//    1.173423191129E+16:
//       en-US:   1.173423191129E+16
//       fr-FR:   1,173423191129E+16
//       ja-JP:   1.173423191129E+16
//       ru-RU:   1,173423191129E+16
// Define an array of numbers to display.
let numbers = [| -1.5345e16f; -123.4321f; 19092.123f; 1.1734231911290e16f |]
// Define the culture names used to display them.
let cultureNames = [| "en-US"; "fr-FR"; "ja-JP"; "ru-RU" |]

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture)}:"
    for cultureName in cultureNames do
        let culture = CultureInfo cultureName
        printfn $"   {culture.Name}: {Convert.ToString(number, culture),20}"
    printfn ""
// The example displays the following output:
//    -1.5345E+16:
//       en-US:          -1.5345E+16
//       fr-FR:          -1,5345E+16
//       ja-JP:          -1.5345E+16
//       ru-RU:          -1,5345E+16
//
//    -123.4321:
//       en-US:            -123.4321
//       fr-FR:            -123,4321
//       ja-JP:            -123.4321
//       ru-RU:            -123,4321
//
//    19092.123:
//       en-US:            19092.123
//       fr-FR:            19092,123
//       ja-JP:            19092.123
//       ru-RU:            19092,123
//
//    1.173423191129E+16:
//       en-US:   1.173423191129E+16
//       fr-FR:   1,173423191129E+16
//       ja-JP:   1.173423191129E+16
//       ru-RU:   1,173423191129E+16
' Define an array of numbers to display.
Dim numbers() As Single = { -1.5345e16, -123.4321, 19092.123, _
                            1.1734231911290e16 }
' Define the culture names used to display them.
Dim cultureNames() As String = { "en-US", "fr-FR", "ja-JP", "ru-RU" }

For Each number As Single In numbers
   Console.WriteLine("{0}:", Convert.ToString(number, _
                             System.Globalization.CultureInfo.InvariantCulture))
   For Each cultureName As String In cultureNames
      Dim culture As New System.Globalization.CultureInfo(cultureName)
      Console.WriteLine("   {0}: {1,20}", _
                        culture.Name, Convert.ToString(number, culture))
   Next
   Console.WriteLine()
Next   
' The example displays the following output:
'    -1.5345E+16:
'       en-US:          -1.5345E+16
'       fr-FR:          -1,5345E+16
'       ja-JP:          -1.5345E+16
'       ru-RU:          -1,5345E+16
'    
'    -123.4321:
'       en-US:            -123.4321
'       fr-FR:            -123,4321
'       ja-JP:            -123.4321
'       ru-RU:            -123,4321
'    
'    19092.123:
'       en-US:            19092.123
'       fr-FR:            19092,123
'       ja-JP:            19092.123
'       ru-RU:            19092,123
'    
'    1.173423191129E+16:
'       en-US:   1.173423191129E+16
'       fr-FR:   1,173423191129E+16
'       ja-JP:   1.173423191129E+16
'       ru-RU:   1,173423191129E+16

注釈

この実装は次と Single.ToString(IFormatProvider)同じです。

適用対象

ToString(String, IFormatProvider)

指定した文字列インスタンスを返します。実際の変換は実行されません。

public:
 static System::String ^ ToString(System::String ^ value, IFormatProvider ^ provider);
public static string? ToString (string? value, IFormatProvider? provider);
public static string ToString (string value, IFormatProvider provider);
static member ToString : string * IFormatProvider -> string
Public Shared Function ToString (value As String, provider As IFormatProvider) As String

パラメーター

value
String

返される文字列。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。 このパラメーターは無視されます。

戻り値

String

value は変更されずに返されます。

次の例では、パラメーターを指定して ToString メソッドを String 呼び出します。 このメソッドは、オブジェクトを参照せずに変更 String されていないオブジェクトを IFormatProvider 返します。

// Example of Convert::ToString( non-numeric types, IFormatProvider ).
using namespace System;
using namespace System::Globalization;

#define null (Object^)0

// An instance of this class can be passed to methods that require 
// an IFormatProvider.
ref class DummyProvider: public IFormatProvider
{
public:

   // Normally, GetFormat returns an object of the requested type
   // (usually itself) if it is able; otherwise, it returns Nothing. 
   virtual Object^ GetFormat( Type^ argType )
   {
      // Here, the type of argType is displayed, and GetFormat
      // always returns Nothing.
      Console::Write( "{0,-40}", argType->ToString() );
      return null;
   }
};

int main()
{
   // Create an instance of the IFormatProvider.
   DummyProvider^ provider = gcnew DummyProvider;
   String^ converted;

   // Convert these values using DummyProvider.
   int Int32A = -252645135;
   double DoubleA = 61680.3855;
   Object^ ObjDouble =  -98765.4321;
   DateTime DayTimeA = DateTime(2001,9,11,13,45,0);
   bool BoolA = true;
   String^ StringA = "Qwerty";
   Char CharA = '$';
   TimeSpan TSpanA = TimeSpan(0,18,0);
   Object^ ObjOther = static_cast<Object^>(provider);
   Console::WriteLine( "This example of "
   "Convert::ToString( non-numeric, IFormatProvider* ) \n"
   "generates the following output. The provider type, "
   "argument type, \nand argument value are displayed." );
   Console::WriteLine( "\nNote: The IFormatProvider object is "
   "not called for Boolean, String, \nChar, TimeSpan, "
   "and non-numeric Object." );

   // The format provider is called for these conversions.
   Console::WriteLine();
   converted = Convert::ToString( Int32A, provider );
   Console::WriteLine( "int      {0}", converted );
   converted = Convert::ToString( DoubleA, provider );
   Console::WriteLine( "double   {0}", converted );
   converted = Convert::ToString( ObjDouble, provider );
   Console::WriteLine( "Object   {0}", converted );
   converted = Convert::ToString( DayTimeA, provider );
   Console::WriteLine( "DateTime {0}", converted );

   // The format provider is not called for these conversions.
   Console::WriteLine();
   converted = Convert::ToString( BoolA, provider );
   Console::WriteLine( "bool     {0}", converted );
   converted = Convert::ToString( StringA, provider );
   Console::WriteLine( "String   {0}", converted );
   converted = Convert::ToString( CharA, provider );
   Console::WriteLine( "Char     {0}", converted );
   converted = Convert::ToString( TSpanA, provider );
   Console::WriteLine( "TimeSpan {0}", converted );
   converted = Convert::ToString( ObjOther, provider );
   Console::WriteLine( "Object   {0}", converted );
}

/*
This example of Convert::ToString( non-numeric, IFormatProvider* )
generates the following output. The provider type, argument type,
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String,
Char, TimeSpan, and non-numeric Object.

System.Globalization.NumberFormatInfo   int      -252645135
System.Globalization.NumberFormatInfo   double   61680.3855
System.Globalization.NumberFormatInfo   Object   -98765.4321
System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM

bool     True
String   Qwerty
Char     $
TimeSpan 00:18:00
Object   DummyProvider
*/
// Example of Convert.ToString( non-numeric types, IFormatProvider ).
using System;
using System.Globalization;

// An instance of this class can be passed to methods that require
// an IFormatProvider.
public class DummyProvider : IFormatProvider
{
    // Normally, GetFormat returns an object of the requested type
    // (usually itself) if it is able; otherwise, it returns Nothing.
    public object GetFormat( Type argType )
    {
        // Here, the type of argType is displayed, and GetFormat
        // always returns Nothing.
        Console.Write( "{0,-40}", argType.ToString( ) );
        return null;
    }
}

class ConvertNonNumericProviderDemo
{
    static void Main( )
    {
        // Create an instance of the IFormatProvider.
        DummyProvider provider = new DummyProvider( );
        string converted;

        // Convert these values using DummyProvider.
        int      Int32A     = -252645135;
        double   DoubleA    = 61680.3855;
        object   ObjDouble  = (object)( -98765.4321 );
        DateTime DayTimeA   = new DateTime( 2001, 9, 11, 13, 45, 0 );

        bool     BoolA      = true;
        string   StringA    = "Qwerty";
        char     CharA      = '$';
        TimeSpan TSpanA     = new TimeSpan( 0, 18, 0 );
        object   ObjOther   = (object)provider;

        Console.WriteLine( "This example of " +
            "Convert.ToString( non-numeric, IFormatProvider ) \n" +
            "generates the following output. The provider type, " +
            "argument type, \nand argument value are displayed." );
        Console.WriteLine( "\nNote: The IFormatProvider object is " +
            "not called for Boolean, String, \nChar, TimeSpan, " +
            "and non-numeric Object." );

        // The format provider is called for these conversions.
        Console.WriteLine( );
        converted = Convert.ToString( Int32A, provider );
        Console.WriteLine( "int      {0}", converted );
        converted = Convert.ToString( DoubleA, provider );
        Console.WriteLine( "double   {0}", converted );
        converted = Convert.ToString( ObjDouble, provider );
        Console.WriteLine( "object   {0}", converted );
        converted = Convert.ToString( DayTimeA, provider );
        Console.WriteLine( "DateTime {0}", converted );

        // The format provider is not called for these conversions.
        Console.WriteLine( );
        converted = Convert.ToString( BoolA, provider );
        Console.WriteLine( "bool     {0}", converted );
        converted = Convert.ToString( StringA, provider );
        Console.WriteLine( "string   {0}", converted );
        converted = Convert.ToString( CharA, provider );
        Console.WriteLine( "char     {0}", converted );
        converted = Convert.ToString( TSpanA, provider );
        Console.WriteLine( "TimeSpan {0}", converted );
        converted = Convert.ToString( ObjOther, provider );
        Console.WriteLine( "object   {0}", converted );
    }
}

/*
This example of Convert.ToString( non-numeric, IFormatProvider )
generates the following output. The provider type, argument type,
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String,
Char, TimeSpan, and non-numeric Object.

System.Globalization.NumberFormatInfo   int      -252645135
System.Globalization.NumberFormatInfo   double   61680.3855
System.Globalization.NumberFormatInfo   object   -98765.4321
System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM

bool     True
string   Qwerty
char     $
TimeSpan 00:18:00
object   DummyProvider

*/
// Example of Convert.ToString(non-numeric types, IFormatProvider).
open System
open System.Globalization

// Create an instance of the IFormatProvider with an object expression.
let provider =
    { new IFormatProvider with
        // Normally, GetFormat returns an object of the requested type
        // (usually itself) if it is able; otherwise, it returns Nothing.
        member _.GetFormat(argType: Type) =
            // Here, the type of argType is displayed, and GetFormat
            // always returns Nothing.
            printf $"{argType,-40}"
            null 
    }

// Convert these values using DummyProvider.
let Int32A     = -252645135
let DoubleA    = 61680.3855
let ObjDouble  = -98765.4321 :> obj
let DayTimeA   = DateTime(2001, 9, 11, 13, 45, 0)

let BoolA      = true
let StringA    = "Qwerty"
let CharA      = '$'
let TSpanA     = TimeSpan(0, 18, 0)
let ObjOther   = provider :> obj

[<EntryPoint>]
let main _ =
    printfn
        """This example of Convert.ToString(non-numeric, IFormatProvider) 
generates the following output. The provider type, argument type, 
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String, 
Char, TimeSpan, and non-numeric Object."""

    // The format provider is called for these conversions.
    printfn ""
    let converted = Convert.ToString(Int32A, provider)
    printfn $"int      {converted}"
    let converted = Convert.ToString(DoubleA, provider)
    printfn $"double   {converted}"
    let converted = Convert.ToString(ObjDouble, provider)
    printfn $"object   {converted}"
    let converted = Convert.ToString(DayTimeA, provider)
    printfn $"DateTime {converted}"

    // The format provider is not called for these conversions.
    printfn ""
    let converted = Convert.ToString(BoolA, provider)
    printfn $"bool     {converted}"
    let converted = Convert.ToString(StringA, provider)
    printfn $"string   {converted}"
    let converted = Convert.ToString(CharA, provider)
    printfn $"char     {converted}"
    let converted = Convert.ToString(TSpanA, provider)
    printfn $"TimeSpan {converted}"
    let converted = Convert.ToString(ObjOther, provider)
    printfn $"object   {converted}"

    0

// This example of Convert.ToString(non-numeric, IFormatProvider)
// generates the following output. The provider type, argument type,
// and argument value are displayed.
//
// Note: The IFormatProvider object is not called for Boolean, String,
// Char, TimeSpan, and non-numeric Object.
//
// System.Globalization.NumberFormatInfo   int      -252645135
// System.Globalization.NumberFormatInfo   double   61680.3855
// System.Globalization.NumberFormatInfo   object   -98765.4321
// System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM
//
// bool     True
// string   Qwerty
// char     $
// TimeSpan 00:18:00
// object   DummyProvider
' Example of Convert.ToString( non-numeric types, IFormatProvider ).
Imports System.Globalization

' An instance of this class can be passed to methods that require 
' an IFormatProvider.
Public Class DummyProvider
    Implements IFormatProvider

    ' Normally, GetFormat returns an object of the requested type
    ' (usually itself) if it is able; otherwise, it returns Nothing. 
    Public Function GetFormat( argType As Type ) As Object _
        Implements IFormatProvider.GetFormat

        ' Here, the type of argType is displayed, and GetFormat
        ' always returns Nothing.
        Console.Write( "{0,-40}", argType.ToString( ) )
        Return Nothing

    End Function 
End Class

Module ConvertNonNumericProviderDemo

    Sub Main( )

        ' Create an instance of the IFormatProvider.
        Dim provider    As New DummyProvider( )
        Dim converted   As String

        ' Convert these values using DummyProvider.
        Dim Int32A      As Integer  = -252645135   
        Dim DoubleA     As Double   = 61680.3855
        Dim ObjDouble   As Object   = CType( -98765.4321, Object )
        Dim DayTimeA    As DateTime = _
                            new DateTime( 2001, 9, 11, 13, 45, 0 )

        Dim BoolA       As Boolean  = True
        Dim StringA     As String   = "Qwerty"
        Dim CharA       As Char     = "$"c
        Dim TSpanA      As TimeSpan = New TimeSpan( 0, 18, 0 )
        Dim ObjOther    As Object   = CType( provider, Object )

        Console.WriteLine( "This example of " & _
            "Convert.ToString( non-numeric, IFormatProvider ) " & _
            vbCrLf & "generates the following output. The " & _
            "provider type, argument type, " & vbCrLf & "and " & _
            "argument value are displayed." )
        Console.WriteLine( vbCrLf & _
            "Note: The IFormatProvider object is not called for " & _
            "Boolean, String, " & vbCrLf & "Char, TimeSpan, " & _
            "and non-numeric Object." )

        ' The format provider is called for these conversions.
        Console.WriteLine( )
        converted =  Convert.ToString( Int32A, provider )
        Console.WriteLine( "Int32    {0}", converted )
        converted =  Convert.ToString( DoubleA, provider )
        Console.WriteLine( "Double   {0}", converted )
        converted =  Convert.ToString( ObjDouble, provider )
        Console.WriteLine( "Object   {0}", converted )
        converted =  Convert.ToString( DayTimeA, provider )
        Console.WriteLine( "DateTime {0}", converted )

        ' The format provider is not called for these conversions.
        Console.WriteLine( )
        converted =  Convert.ToString( BoolA, provider )
        Console.WriteLine( "Boolean  {0}", converted )
        converted =  Convert.ToString( StringA, provider )
        Console.WriteLine( "String   {0}", converted )
        converted =  Convert.ToString( CharA, provider )
        Console.WriteLine( "Char     {0}", converted )
        converted =  Convert.ToString( TSpanA, provider )
        Console.WriteLine( "TimeSpan {0}", converted )
        converted =  Convert.ToString( ObjOther, provider )
        Console.WriteLine( "Object   {0}", converted )

    End Sub
End Module

' This example of Convert.ToString( non-numeric, IFormatProvider )
' generates the following output. The provider type, argument type,
' and argument value are displayed.
'
' Note: The IFormatProvider object is not called for Boolean, String,
' Char, TimeSpan, and non-numeric Object.
' 
' System.Globalization.NumberFormatInfo   Int32    -252645135
' System.Globalization.NumberFormatInfo   Double   61680.3855
' System.Globalization.NumberFormatInfo   Object   -98765.4321
' System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM
' 
' Boolean  True
' String   Qwerty
' Char     $
' TimeSpan 00:18:00
' Object   DummyProvider

適用対象

ToString(UInt16, IFormatProvider)

重要

この API は CLS 準拠ではありません。

指定したカルチャに固有の書式情報を使用して、指定した 16 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::UInt16 value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static string ToString (ushort value, IFormatProvider provider);
[System.CLSCompliant(false)]
public static string ToString (ushort value, IFormatProvider? provider);
[<System.CLSCompliant(false)>]
static member ToString : uint16 * IFormatProvider -> string
Public Shared Function ToString (value As UShort, provider As IFormatProvider) As String

パラメーター

value
UInt16

変換する 16 ビット符号なし整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

属性

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを ToString(UInt16, IFormatProvider) 呼び出して、16 ビット符号なし整数値を等価の文字列表現に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトの両方が使用されます。 既定では、"G" 書式指定子には正の値を持つ正の符号が含まれていないため、出力は、この書式設定情報が使用されていないことを示します。

ushort number = UInt16.MaxValue;
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";

Console.WriteLine("{0,-6}  -->  {1,6}",
                  Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture),
                  Convert.ToString(number, nfi));
// The example displays the following output:
//       65535   -->   65535
let number = UInt16.MaxValue
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"

printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture),-6}  -->  {Convert.ToString(number, nfi),6}"
// The example displays the following output:
//       65535   -->   65535
Dim number As UShort = UInt16.MaxValue
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"

Console.WriteLine("{0,-6}  -->  {1,6}", _
                  Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture), _
                  Convert.ToString(number, nfi))
' The example displays the following output:
'       65535   -->   65535

注釈

この実装は次と UInt16.ToString(IFormatProvider)同じです。

適用対象

ToString(UInt32, IFormatProvider)

重要

この API は CLS 準拠ではありません。

指定したカルチャに固有の書式情報を使用して、指定した 32 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::UInt32 value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static string ToString (uint value, IFormatProvider provider);
[System.CLSCompliant(false)]
public static string ToString (uint value, IFormatProvider? provider);
[<System.CLSCompliant(false)>]
static member ToString : uint32 * IFormatProvider -> string
Public Shared Function ToString (value As UInteger, provider As IFormatProvider) As String

パラメーター

value
UInt32

変換する 32 ビット符号なし整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

属性

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを ToString(UInt32, IFormatProvider) 呼び出して、符号なし整数値を等価の文字列形式に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトの両方が使用されます。 既定では、"G" 書式指定子には正の値を持つ正の符号が含まれていないため、出力は、この書式設定情報が使用されていないことを示します。

uint number = UInt32.MaxValue;
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";

Console.WriteLine("{0,-8}  -->  {1,8}",
                  Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture),
                  Convert.ToString(number, nfi));
// The example displays the following output:
//       4294967295  -->  4294967295
let number = UInt32.MaxValue
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"

printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture),-8}  -->  {Convert.ToString(number, nfi),8}"
// The example displays the following output:
//       4294967295  -->  4294967295
Dim number As UInteger = UInt32.MaxValue
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"

Console.WriteLine("{0,-8}  -->  {1,8}", _
                  Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture), _
                  Convert.ToString(number, nfi))
' The example displays the following output:
'       4294967295  -->  4294967295

注釈

この実装は次と UInt32.ToString(IFormatProvider)同じです。

適用対象

ToString(UInt64, IFormatProvider)

重要

この API は CLS 準拠ではありません。

指定したカルチャに固有の書式情報を使用して、指定した 64 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::UInt64 value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static string ToString (ulong value, IFormatProvider provider);
[System.CLSCompliant(false)]
public static string ToString (ulong value, IFormatProvider? provider);
[<System.CLSCompliant(false)>]
static member ToString : uint64 * IFormatProvider -> string
Public Shared Function ToString (value As ULong, provider As IFormatProvider) As String

パラメーター

value
UInt64

変換する 64 ビット符号なし整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

属性

次の例では、負の符号を文字列 "~" として定義し、その正符号を文字列 "!" として定義するカスタム NumberFormatInfo クラスを定義します。 次に、メソッドを ToString(UInt64, IFormatProvider) 呼び出して、符号なし long 整数値を等価の文字列形式に変換します。 変換では、インバリアント カルチャとカスタム NumberFormatInfo オブジェクトの両方が使用されます。 既定では、"G" 書式指定子には正の値を持つ正の符号が含まれていないため、出力は、この書式設定情報が使用されていないことを示します。

ulong number = UInt64.MaxValue;
System.Globalization.NumberFormatInfo nfi = new System.Globalization.NumberFormatInfo();
nfi.NegativeSign = "~";
nfi.PositiveSign = "!";

Console.WriteLine("{0,-12}  -->  {1,12}",
                  Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture),
                  Convert.ToString(number, nfi));
// The example displays the following output:
//    18446744073709551615  -->  18446744073709551615
let number = UInt64.MaxValue
let nfi = NumberFormatInfo()
nfi.NegativeSign <- "~"
nfi.PositiveSign <- "!"

printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture),-12}  -->  {Convert.ToString(number, nfi),12}"
// The example displays the following output:
//    18446744073709551615  -->  18446744073709551615
Dim number As ULong = UInt64.MaxValue
Dim nfi As New System.Globalization.NumberFormatInfo()
nfi.NegativeSign = "~"
nfi.PositiveSign = "!"

Console.WriteLine("{0,-12}  -->  {1,12}", _
                  Convert.ToString(number, System.Globalization.CultureInfo.InvariantCulture), _
                  Convert.ToString(number, nfi))
' The example displays the following output:
'    18446744073709551615  -->  18446744073709551615

注釈

この実装は次と UInt64.ToString(IFormatProvider)同じです。

適用対象

ToString(DateTime, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した DateTime の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(DateTime value, IFormatProvider ^ provider);
public static string ToString (DateTime value, IFormatProvider provider);
public static string ToString (DateTime value, IFormatProvider? provider);
static member ToString : DateTime * IFormatProvider -> string
Public Shared Function ToString (value As DateTime, provider As IFormatProvider) As String

パラメーター

value
DateTime

変換する日時の値。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、 DateTime 8 つの異なるカルチャで値を等価の文字列表現に変換します。

// Specify the date to be formatted using various cultures.
DateTime tDate = new DateTime(2010, 4, 15, 20, 30, 40, 333);
// Specify the cultures.
string[] cultureNames = { "en-US", "es-AR", "fr-FR", "hi-IN",
                          "ja-JP", "nl-NL", "ru-RU", "ur-PK" };

Console.WriteLine("Converting the date {0}: ",
                  Convert.ToString(tDate,
                          System.Globalization.CultureInfo.InvariantCulture));

foreach (string cultureName in cultureNames)
{
   System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo(cultureName);
   string dateString = Convert.ToString(tDate, culture);
   Console.WriteLine("   {0}:  {1,-12}",
                     culture.Name, dateString);
}
// The example displays the following output:
//       Converting the date 04/15/2010 20:30:40:
//          en-US:  4/15/2010 8:30:40 PM
//          es-AR:  15/04/2010 08:30:40 p.m.
//          fr-FR:  15/04/2010 20:30:40
//          hi-IN:  15-04-2010 20:30:40
//          ja-JP:  2010/04/15 20:30:40
//          nl-NL:  15-4-2010 20:30:40
//          ru-RU:  15.04.2010 20:30:40
//          ur-PK:  15/04/2010 8:30:40 PM
// Specify the date to be formatted using various cultures.
let tDate = DateTime(2010, 4, 15, 20, 30, 40, 333)
// Specify the cultures.
let cultureNames = 
    [| "en-US"; "es-AR"; "fr-FR"; "hi-IN";
        "ja-JP"; "nl-NL"; "ru-RU"; "ur-PK" |]

printfn $"Converting the date {Convert.ToString(tDate, CultureInfo.InvariantCulture)}: "

for cultureName in cultureNames do
    let culture = CultureInfo cultureName
    let dateString = Convert.ToString(tDate, culture)
    printfn $"   {culture.Name}:  {dateString,-12}"
// The example displays the following output:
//       Converting the date 04/15/2010 20:30:40:
//          en-US:  4/15/2010 8:30:40 PM
//          es-AR:  15/04/2010 08:30:40 p.m.
//          fr-FR:  15/04/2010 20:30:40
//          hi-IN:  15-04-2010 20:30:40
//          ja-JP:  2010/04/15 20:30:40
//          nl-NL:  15-4-2010 20:30:40
//          ru-RU:  15.04.2010 20:30:40
//          ur-PK:  15/04/2010 8:30:40 PM
' Specify the date to be formatted using various cultures.
Dim tDate As New Date(2010, 4, 15, 20, 30, 40, 333)
' Specify the cultures.
Dim cultureNames() As String = { "en-US", "es-AR", "fr-FR", "hi-IN", _
                                 "ja-JP", "nl-NL", "ru-RU", "ur-PK" }

Console.WriteLine("Converting the date {0}: ", _
                  Convert.ToString(tDate, _
                          System.Globalization.CultureInfo.InvariantCulture))

For Each cultureName As String In CultureNames
   Dim culture As New System.Globalization.CultureInfo(cultureName)
   Dim dateString As String = Convert.ToString(tDate, culture)
   Console.WriteLine("   {0}:  {1,-12}", _
                     culture.Name, dateString)
Next             
' The example displays the following output:
'       Converting the date 04/15/2010 20:30:40:
'          en-US:  4/15/2010 8:30:40 PM
'          es-AR:  15/04/2010 08:30:40 p.m.
'          fr-FR:  15/04/2010 20:30:40
'          hi-IN:  15-04-2010 20:30:40
'          ja-JP:  2010/04/15 20:30:40
'          nl-NL:  15-4-2010 20:30:40
'          ru-RU:  15.04.2010 20:30:40
'          ur-PK:  15/04/2010 8:30:40 PM

注釈

この実装は次と DateTime.ToString(IFormatProvider)同じです。

適用対象

ToString(Int64, Int32)

64 ビット符号付き整数の値を、指定した基数でそれと等しい文字列形式に変換します。

public:
 static System::String ^ ToString(long value, int toBase);
public static string ToString (long value, int toBase);
static member ToString : int64 * int -> string
Public Shared Function ToString (value As Long, toBase As Integer) As String

パラメーター

value
Int64

変換する 64 ビット符号付き整数。

toBase
Int32

戻り値の基数。これは 2、8、10、16 である必要があります。

戻り値

String

基数 valuetoBase の文字列形式。

例外

toBase が 2、8、10、16 のどれでもありません。

次の例では、長整数配列の各要素を等価のバイナリ、16 進数、10 進数、および 16 進数の文字列表現に変換します。

int[] bases = { 2, 8, 10, 16};
long[] numbers = { Int64.MinValue, -193275430, -13621, -18, 12,
                   1914206117, Int64.MaxValue };

foreach (int baseValue in bases)
{
   Console.WriteLine("Base {0} conversion:", baseValue);
   foreach (long number in numbers)
   {
      Console.WriteLine("   {0,-23}  -->  0x{1}",
                        number, Convert.ToString(number, baseValue));
   }
}
// The example displays the following output:
//    Base 2 conversion:
//       -9223372036854775808     -->  0x1000000000000000000000000000000000000000000000000000000000000000
//       -193275430               -->  0x1111111111111111111111111111111111110100011110101101100111011010
//       -13621                   -->  0x1111111111111111111111111111111111111111111111111100101011001011
//       -18                      -->  0x1111111111111111111111111111111111111111111111111111111111101110
//       12                       -->  0x1100
//       1914206117               -->  0x1110010000110000111011110100101
//       9223372036854775807      -->  0x111111111111111111111111111111111111111111111111111111111111111
//    Base 8 conversion:
//       -9223372036854775808     -->  0x1000000000000000000000
//       -193275430               -->  0x1777777777776436554732
//       -13621                   -->  0x1777777777777777745313
//       -18                      -->  0x1777777777777777777756
//       12                       -->  0x14
//       1914206117               -->  0x16206073645
//       9223372036854775807      -->  0x777777777777777777777
//    Base 10 conversion:
//       -9223372036854775808     -->  0x-9223372036854775808
//       -193275430               -->  0x-193275430
//       -13621                   -->  0x-13621
//       -18                      -->  0x-18
//       12                       -->  0x12
//       1914206117               -->  0x1914206117
//       9223372036854775807      -->  0x9223372036854775807
//    Base 16 conversion:
//       -9223372036854775808     -->  0x8000000000000000
//       -193275430               -->  0xfffffffff47ad9da
//       -13621                   -->  0xffffffffffffcacb
//       -18                      -->  0xffffffffffffffee
//       12                       -->  0xc
//       1914206117               -->  0x721877a5
//       9223372036854775807      -->  0x7fffffffffffffff
let bases = [| 2; 8; 10; 16 |]
let numbers =
    [| Int64.MinValue; -193275430; -13621; -18; 12; 1914206117; Int64.MaxValue |]

for baseValue in bases do
    printfn $"Base {baseValue} conversion:"
    for number in numbers do
        printfn $"   {number,-23}  -->  0x{Convert.ToString(number, baseValue)}"
// The example displays the following output:
//    Base 2 conversion:
//       -9223372036854775808     -->  0x1000000000000000000000000000000000000000000000000000000000000000
//       -193275430               -->  0x1111111111111111111111111111111111110100011110101101100111011010
//       -13621                   -->  0x1111111111111111111111111111111111111111111111111100101011001011
//       -18                      -->  0x1111111111111111111111111111111111111111111111111111111111101110
//       12                       -->  0x1100
//       1914206117               -->  0x1110010000110000111011110100101
//       9223372036854775807      -->  0x111111111111111111111111111111111111111111111111111111111111111
//    Base 8 conversion:
//       -9223372036854775808     -->  0x1000000000000000000000
//       -193275430               -->  0x1777777777776436554732
//       -13621                   -->  0x1777777777777777745313
//       -18                      -->  0x1777777777777777777756
//       12                       -->  0x14
//       1914206117               -->  0x16206073645
//       9223372036854775807      -->  0x777777777777777777777
//    Base 10 conversion:
//       -9223372036854775808     -->  0x-9223372036854775808
//       -193275430               -->  0x-193275430
//       -13621                   -->  0x-13621
//       -18                      -->  0x-18
//       12                       -->  0x12
//       1914206117               -->  0x1914206117
//       9223372036854775807      -->  0x9223372036854775807
//    Base 16 conversion:
//       -9223372036854775808     -->  0x8000000000000000
//       -193275430               -->  0xfffffffff47ad9da
//       -13621                   -->  0xffffffffffffcacb
//       -18                      -->  0xffffffffffffffee
//       12                       -->  0xc
//       1914206117               -->  0x721877a5
//       9223372036854775807      -->  0x7fffffffffffffff
Dim bases() As Integer = { 2, 8, 10, 16}
Dim numbers() As Long = { Int64.MinValue, -193275430, -13621, -18, 12, _
                             1914206117, Int64.MaxValue }

For Each base As Integer In bases
   Console.WriteLine("Base {0} conversion:", base)
   For Each number As Long In numbers
      Console.WriteLine("   {0,-23}  -->  0x{1}", _
                        number, Convert.ToString(number, base))
   Next
Next
' The example displays the following output:
'    Base 2 conversion:
'       -9223372036854775808     -->  0x1000000000000000000000000000000000000000000000000000000000000000
'       -193275430               -->  0x1111111111111111111111111111111111110100011110101101100111011010
'       -13621                   -->  0x1111111111111111111111111111111111111111111111111100101011001011
'       -18                      -->  0x1111111111111111111111111111111111111111111111111111111111101110
'       12                       -->  0x1100
'       1914206117               -->  0x1110010000110000111011110100101
'       9223372036854775807      -->  0x111111111111111111111111111111111111111111111111111111111111111
'    Base 8 conversion:
'       -9223372036854775808     -->  0x1000000000000000000000
'       -193275430               -->  0x1777777777776436554732
'       -13621                   -->  0x1777777777777777745313
'       -18                      -->  0x1777777777777777777756
'       12                       -->  0x14
'       1914206117               -->  0x16206073645
'       9223372036854775807      -->  0x777777777777777777777
'    Base 10 conversion:
'       -9223372036854775808     -->  0x-9223372036854775808
'       -193275430               -->  0x-193275430
'       -13621                   -->  0x-13621
'       -18                      -->  0x-18
'       12                       -->  0x12
'       1914206117               -->  0x1914206117
'       9223372036854775807      -->  0x9223372036854775807
'    Base 16 conversion:
'       -9223372036854775808     -->  0x8000000000000000
'       -193275430               -->  0xfffffffff47ad9da
'       -13621                   -->  0xffffffffffffcacb
'       -18                      -->  0xffffffffffffffee
'       12                       -->  0xc
'       1914206117               -->  0x721877a5
'       9223372036854775807      -->  0x7fffffffffffffff
let bases = [2; 8; 10; 16]
let numbers = [ Int64.MinValue; -193275430L; -13621L; -18L; 12L; 1914206117L; Int64.MaxValue ]

for baseValue in bases do
    printfn "Base %i conversion:" baseValue
    for number in numbers do
        printfn "   % -23i  -->  0x%s" number (Convert.ToString (number, baseValue))
// The example displays the following output:
//     Base 2 conversion:
//        -9223372036854775808     -->  0x1000000000000000000000000000000000000000000000000000000000000000
//        -193275430               -->  0x1111111111111111111111111111111111110100011110101101100111011010
//        -13621                   -->  0x1111111111111111111111111111111111111111111111111100101011001011
//        -18                      -->  0x1111111111111111111111111111111111111111111111111111111111101110
//         12                      -->  0x1100
//         1914206117              -->  0x1110010000110000111011110100101
//         9223372036854775807     -->  0x111111111111111111111111111111111111111111111111111111111111111
//     Base 8 conversion:
//        -9223372036854775808     -->  0x1000000000000000000000
//        -193275430               -->  0x1777777777776436554732
//        -13621                   -->  0x1777777777777777745313
//        -18                      -->  0x1777777777777777777756
//         12                      -->  0x14
//         1914206117              -->  0x16206073645
//         9223372036854775807     -->  0x777777777777777777777
//     Base 10 conversion:
//        -9223372036854775808     -->  0x-9223372036854775808
//        -193275430               -->  0x-193275430
//        -13621                   -->  0x-13621
//        -18                      -->  0x-18
//         12                      -->  0x12
//         1914206117              -->  0x1914206117
//         9223372036854775807     -->  0x9223372036854775807
//     Base 16 conversion:
//        -9223372036854775808     -->  0x8000000000000000
//        -193275430               -->  0xfffffffff47ad9da
//        -13621                   -->  0xffffffffffffcacb
//        -18                      -->  0xffffffffffffffee
//         12                      -->  0xc
//         1914206117              -->  0x721877a5
//         9223372036854775807     -->  0x7fffffffffffffff

注釈

正の値が toBase 10 でない場合value、返される文字列は符号と大きさの表現を使用します。 負の値で toBase 10 でない場合value、返される文字列は 2 の補数表現を使用します。 つまり、最上位バイト (ビット 63) の上位ビットが符号ビットとして解釈されます。 後で ToString(Int64, Int32) 数値に変換される文字列を作成するためにメソッドを呼び出す場合は、同様の数値表現を想定する対応するメソッドを呼び出して変換を実行する必要があります。 このような方法には、以下がInt64.Parse(String, NumberStyles)含まれますConvert.ToInt64(String, Int32)

適用対象

ToString(Char, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した Unicode 文字の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(char value, IFormatProvider ^ provider);
public static string ToString (char value, IFormatProvider provider);
public static string ToString (char value, IFormatProvider? provider);
static member ToString : char * IFormatProvider -> string
Public Shared Function ToString (value As Char, provider As IFormatProvider) As String

パラメーター

value
Char

変換する Unicode 文字。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。 このパラメーターは無視されます。

戻り値

String

value の文字列形式。

次の例では、呼び出される書式プロバイダーの型を表示するオブジェクトをIFormatProvider使用して、メソッドを使用して値ToStringStringを a に変換Charします。 この例は、オブジェクトが参照されていないことを IFormatProvider 示しています。

// Example of Convert::ToString( non-numeric types, IFormatProvider ).
using namespace System;
using namespace System::Globalization;

#define null (Object^)0

// An instance of this class can be passed to methods that require 
// an IFormatProvider.
ref class DummyProvider: public IFormatProvider
{
public:

   // Normally, GetFormat returns an object of the requested type
   // (usually itself) if it is able; otherwise, it returns Nothing. 
   virtual Object^ GetFormat( Type^ argType )
   {
      // Here, the type of argType is displayed, and GetFormat
      // always returns Nothing.
      Console::Write( "{0,-40}", argType->ToString() );
      return null;
   }
};

int main()
{
   // Create an instance of the IFormatProvider.
   DummyProvider^ provider = gcnew DummyProvider;
   String^ converted;

   // Convert these values using DummyProvider.
   int Int32A = -252645135;
   double DoubleA = 61680.3855;
   Object^ ObjDouble =  -98765.4321;
   DateTime DayTimeA = DateTime(2001,9,11,13,45,0);
   bool BoolA = true;
   String^ StringA = "Qwerty";
   Char CharA = '$';
   TimeSpan TSpanA = TimeSpan(0,18,0);
   Object^ ObjOther = static_cast<Object^>(provider);
   Console::WriteLine( "This example of "
   "Convert::ToString( non-numeric, IFormatProvider* ) \n"
   "generates the following output. The provider type, "
   "argument type, \nand argument value are displayed." );
   Console::WriteLine( "\nNote: The IFormatProvider object is "
   "not called for Boolean, String, \nChar, TimeSpan, "
   "and non-numeric Object." );

   // The format provider is called for these conversions.
   Console::WriteLine();
   converted = Convert::ToString( Int32A, provider );
   Console::WriteLine( "int      {0}", converted );
   converted = Convert::ToString( DoubleA, provider );
   Console::WriteLine( "double   {0}", converted );
   converted = Convert::ToString( ObjDouble, provider );
   Console::WriteLine( "Object   {0}", converted );
   converted = Convert::ToString( DayTimeA, provider );
   Console::WriteLine( "DateTime {0}", converted );

   // The format provider is not called for these conversions.
   Console::WriteLine();
   converted = Convert::ToString( BoolA, provider );
   Console::WriteLine( "bool     {0}", converted );
   converted = Convert::ToString( StringA, provider );
   Console::WriteLine( "String   {0}", converted );
   converted = Convert::ToString( CharA, provider );
   Console::WriteLine( "Char     {0}", converted );
   converted = Convert::ToString( TSpanA, provider );
   Console::WriteLine( "TimeSpan {0}", converted );
   converted = Convert::ToString( ObjOther, provider );
   Console::WriteLine( "Object   {0}", converted );
}

/*
This example of Convert::ToString( non-numeric, IFormatProvider* )
generates the following output. The provider type, argument type,
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String,
Char, TimeSpan, and non-numeric Object.

System.Globalization.NumberFormatInfo   int      -252645135
System.Globalization.NumberFormatInfo   double   61680.3855
System.Globalization.NumberFormatInfo   Object   -98765.4321
System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM

bool     True
String   Qwerty
Char     $
TimeSpan 00:18:00
Object   DummyProvider
*/
// Example of Convert.ToString( non-numeric types, IFormatProvider ).
using System;
using System.Globalization;

// An instance of this class can be passed to methods that require
// an IFormatProvider.
public class DummyProvider : IFormatProvider
{
    // Normally, GetFormat returns an object of the requested type
    // (usually itself) if it is able; otherwise, it returns Nothing.
    public object GetFormat( Type argType )
    {
        // Here, the type of argType is displayed, and GetFormat
        // always returns Nothing.
        Console.Write( "{0,-40}", argType.ToString( ) );
        return null;
    }
}

class ConvertNonNumericProviderDemo
{
    static void Main( )
    {
        // Create an instance of the IFormatProvider.
        DummyProvider provider = new DummyProvider( );
        string converted;

        // Convert these values using DummyProvider.
        int      Int32A     = -252645135;
        double   DoubleA    = 61680.3855;
        object   ObjDouble  = (object)( -98765.4321 );
        DateTime DayTimeA   = new DateTime( 2001, 9, 11, 13, 45, 0 );

        bool     BoolA      = true;
        string   StringA    = "Qwerty";
        char     CharA      = '$';
        TimeSpan TSpanA     = new TimeSpan( 0, 18, 0 );
        object   ObjOther   = (object)provider;

        Console.WriteLine( "This example of " +
            "Convert.ToString( non-numeric, IFormatProvider ) \n" +
            "generates the following output. The provider type, " +
            "argument type, \nand argument value are displayed." );
        Console.WriteLine( "\nNote: The IFormatProvider object is " +
            "not called for Boolean, String, \nChar, TimeSpan, " +
            "and non-numeric Object." );

        // The format provider is called for these conversions.
        Console.WriteLine( );
        converted = Convert.ToString( Int32A, provider );
        Console.WriteLine( "int      {0}", converted );
        converted = Convert.ToString( DoubleA, provider );
        Console.WriteLine( "double   {0}", converted );
        converted = Convert.ToString( ObjDouble, provider );
        Console.WriteLine( "object   {0}", converted );
        converted = Convert.ToString( DayTimeA, provider );
        Console.WriteLine( "DateTime {0}", converted );

        // The format provider is not called for these conversions.
        Console.WriteLine( );
        converted = Convert.ToString( BoolA, provider );
        Console.WriteLine( "bool     {0}", converted );
        converted = Convert.ToString( StringA, provider );
        Console.WriteLine( "string   {0}", converted );
        converted = Convert.ToString( CharA, provider );
        Console.WriteLine( "char     {0}", converted );
        converted = Convert.ToString( TSpanA, provider );
        Console.WriteLine( "TimeSpan {0}", converted );
        converted = Convert.ToString( ObjOther, provider );
        Console.WriteLine( "object   {0}", converted );
    }
}

/*
This example of Convert.ToString( non-numeric, IFormatProvider )
generates the following output. The provider type, argument type,
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String,
Char, TimeSpan, and non-numeric Object.

System.Globalization.NumberFormatInfo   int      -252645135
System.Globalization.NumberFormatInfo   double   61680.3855
System.Globalization.NumberFormatInfo   object   -98765.4321
System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM

bool     True
string   Qwerty
char     $
TimeSpan 00:18:00
object   DummyProvider

*/
// Example of Convert.ToString(non-numeric types, IFormatProvider).
open System
open System.Globalization

// Create an instance of the IFormatProvider with an object expression.
let provider =
    { new IFormatProvider with
        // Normally, GetFormat returns an object of the requested type
        // (usually itself) if it is able; otherwise, it returns Nothing.
        member _.GetFormat(argType: Type) =
            // Here, the type of argType is displayed, and GetFormat
            // always returns Nothing.
            printf $"{argType,-40}"
            null 
    }

// Convert these values using DummyProvider.
let Int32A     = -252645135
let DoubleA    = 61680.3855
let ObjDouble  = -98765.4321 :> obj
let DayTimeA   = DateTime(2001, 9, 11, 13, 45, 0)

let BoolA      = true
let StringA    = "Qwerty"
let CharA      = '$'
let TSpanA     = TimeSpan(0, 18, 0)
let ObjOther   = provider :> obj

[<EntryPoint>]
let main _ =
    printfn
        """This example of Convert.ToString(non-numeric, IFormatProvider) 
generates the following output. The provider type, argument type, 
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String, 
Char, TimeSpan, and non-numeric Object."""

    // The format provider is called for these conversions.
    printfn ""
    let converted = Convert.ToString(Int32A, provider)
    printfn $"int      {converted}"
    let converted = Convert.ToString(DoubleA, provider)
    printfn $"double   {converted}"
    let converted = Convert.ToString(ObjDouble, provider)
    printfn $"object   {converted}"
    let converted = Convert.ToString(DayTimeA, provider)
    printfn $"DateTime {converted}"

    // The format provider is not called for these conversions.
    printfn ""
    let converted = Convert.ToString(BoolA, provider)
    printfn $"bool     {converted}"
    let converted = Convert.ToString(StringA, provider)
    printfn $"string   {converted}"
    let converted = Convert.ToString(CharA, provider)
    printfn $"char     {converted}"
    let converted = Convert.ToString(TSpanA, provider)
    printfn $"TimeSpan {converted}"
    let converted = Convert.ToString(ObjOther, provider)
    printfn $"object   {converted}"

    0

// This example of Convert.ToString(non-numeric, IFormatProvider)
// generates the following output. The provider type, argument type,
// and argument value are displayed.
//
// Note: The IFormatProvider object is not called for Boolean, String,
// Char, TimeSpan, and non-numeric Object.
//
// System.Globalization.NumberFormatInfo   int      -252645135
// System.Globalization.NumberFormatInfo   double   61680.3855
// System.Globalization.NumberFormatInfo   object   -98765.4321
// System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM
//
// bool     True
// string   Qwerty
// char     $
// TimeSpan 00:18:00
// object   DummyProvider
' Example of Convert.ToString( non-numeric types, IFormatProvider ).
Imports System.Globalization

' An instance of this class can be passed to methods that require 
' an IFormatProvider.
Public Class DummyProvider
    Implements IFormatProvider

    ' Normally, GetFormat returns an object of the requested type
    ' (usually itself) if it is able; otherwise, it returns Nothing. 
    Public Function GetFormat( argType As Type ) As Object _
        Implements IFormatProvider.GetFormat

        ' Here, the type of argType is displayed, and GetFormat
        ' always returns Nothing.
        Console.Write( "{0,-40}", argType.ToString( ) )
        Return Nothing

    End Function 
End Class

Module ConvertNonNumericProviderDemo

    Sub Main( )

        ' Create an instance of the IFormatProvider.
        Dim provider    As New DummyProvider( )
        Dim converted   As String

        ' Convert these values using DummyProvider.
        Dim Int32A      As Integer  = -252645135   
        Dim DoubleA     As Double   = 61680.3855
        Dim ObjDouble   As Object   = CType( -98765.4321, Object )
        Dim DayTimeA    As DateTime = _
                            new DateTime( 2001, 9, 11, 13, 45, 0 )

        Dim BoolA       As Boolean  = True
        Dim StringA     As String   = "Qwerty"
        Dim CharA       As Char     = "$"c
        Dim TSpanA      As TimeSpan = New TimeSpan( 0, 18, 0 )
        Dim ObjOther    As Object   = CType( provider, Object )

        Console.WriteLine( "This example of " & _
            "Convert.ToString( non-numeric, IFormatProvider ) " & _
            vbCrLf & "generates the following output. The " & _
            "provider type, argument type, " & vbCrLf & "and " & _
            "argument value are displayed." )
        Console.WriteLine( vbCrLf & _
            "Note: The IFormatProvider object is not called for " & _
            "Boolean, String, " & vbCrLf & "Char, TimeSpan, " & _
            "and non-numeric Object." )

        ' The format provider is called for these conversions.
        Console.WriteLine( )
        converted =  Convert.ToString( Int32A, provider )
        Console.WriteLine( "Int32    {0}", converted )
        converted =  Convert.ToString( DoubleA, provider )
        Console.WriteLine( "Double   {0}", converted )
        converted =  Convert.ToString( ObjDouble, provider )
        Console.WriteLine( "Object   {0}", converted )
        converted =  Convert.ToString( DayTimeA, provider )
        Console.WriteLine( "DateTime {0}", converted )

        ' The format provider is not called for these conversions.
        Console.WriteLine( )
        converted =  Convert.ToString( BoolA, provider )
        Console.WriteLine( "Boolean  {0}", converted )
        converted =  Convert.ToString( StringA, provider )
        Console.WriteLine( "String   {0}", converted )
        converted =  Convert.ToString( CharA, provider )
        Console.WriteLine( "Char     {0}", converted )
        converted =  Convert.ToString( TSpanA, provider )
        Console.WriteLine( "TimeSpan {0}", converted )
        converted =  Convert.ToString( ObjOther, provider )
        Console.WriteLine( "Object   {0}", converted )

    End Sub
End Module

' This example of Convert.ToString( non-numeric, IFormatProvider )
' generates the following output. The provider type, argument type,
' and argument value are displayed.
'
' Note: The IFormatProvider object is not called for Boolean, String,
' Char, TimeSpan, and non-numeric Object.
' 
' System.Globalization.NumberFormatInfo   Int32    -252645135
' System.Globalization.NumberFormatInfo   Double   61680.3855
' System.Globalization.NumberFormatInfo   Object   -98765.4321
' System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM
' 
' Boolean  True
' String   Qwerty
' Char     $
' TimeSpan 00:18:00
' Object   DummyProvider

注釈

この実装は次と Char.ToString()同じです。 provider パラメーターは無視されます。

適用対象

ToString(UInt32)

重要

この API は CLS 準拠ではありません。

指定した 32 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::UInt32 value);
[System.CLSCompliant(false)]
public static string ToString (uint value);
[<System.CLSCompliant(false)>]
static member ToString : uint32 -> string
Public Shared Function ToString (value As UInteger) As String

パラメーター

value
UInt32

変換する 32 ビット符号なし整数。

戻り値

String

value の文字列形式。

属性

次の例では、符号なし整数配列内の各要素を等価の文字列形式に変換します。

uint[] numbers = { UInt32.MinValue, 103, 1045, 119543, UInt32.MaxValue };
string result;

foreach (uint number in numbers)
{
   result = Convert.ToString(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the UInt32 value 0 to the String value 0.
//    Converted the UInt32 value 103 to the String value 103.
//    Converted the UInt32 value 1045 to the String value 1045.
//    Converted the UInt32 value 119543 to the String value 119543.
//    Converted the UInt32 value 4294967295 to the String value 4294967295.
let numbers = [| UInt32.MinValue; 103u; 1045u; 119543u; UInt32.MaxValue |]

for number in numbers do
    let result = Convert.ToString number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the UInt32 value 0 to the String value 0.
//    Converted the UInt32 value 103 to the String value 103.
//    Converted the UInt32 value 1045 to the String value 1045.
//    Converted the UInt32 value 119543 to the String value 119543.
//    Converted the UInt32 value 4294967295 to the String value 4294967295.
Dim numbers() As UInteger = { UInt32.MinValue, 103, 1045, 119543, UInt32.MaxValue }
Dim result As String

For Each number As UInteger In numbers
   result = Convert.ToString(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the UInt32 value 0 to the String value 0.
'    Converted the UInt32 value 103 to the String value 103.
'    Converted the UInt32 value 1045 to the String value 1045.
'    Converted the UInt32 value 119543 to the String value 119543.
'    Converted the UInt32 value 4294967295 to the String value 4294967295.

注釈

この実装は次と UInt32.ToString()同じです。

適用対象

ToString(Byte, IFormatProvider)

指定したカルチャに固有の書式情報を使用して、指定した 8 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::Byte value, IFormatProvider ^ provider);
public static string ToString (byte value, IFormatProvider provider);
public static string ToString (byte value, IFormatProvider? provider);
static member ToString : byte * IFormatProvider -> string
Public Shared Function ToString (value As Byte, provider As IFormatProvider) As String

パラメーター

value
Byte

変換する 8 ビット符号なし整数。

provider
IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

String

value の文字列形式。

次の例では、en-US カルチャと fr-FR カルチャの書式設定規則を使用して、符号なしバイト配列内の各要素を等価の文字列形式に変換します。 既定では、"G" 指定子はバイト値の文字列表現で 10 進数のみを出力するため、 provider パラメーターは返される文字列の書式設定には影響しません。

byte[] numbers = { 12, 100, Byte.MaxValue };
// Define the culture names used to display them.
string[] cultureNames = { "en-US", "fr-FR" };

foreach (byte number in numbers)
{
   Console.WriteLine("{0}:", Convert.ToString(number,
                             System.Globalization.CultureInfo.InvariantCulture));
   foreach (string cultureName in cultureNames)
   {
      System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo(cultureName);
      Console.WriteLine("   {0}: {1,20}",
                        culture.Name, Convert.ToString(number, culture));
   }
   Console.WriteLine();
}
// The example displays the following output:
//       12:
//          en-US:                   12
//          fr-FR:                   12
//
//       100:
//          en-US:                  100
//          fr-FR:                  100
//
//       255:
//          en-US:                  255
//          fr-FR:                  255
let numbers = [| 12uy; 100uy; Byte.MaxValue |]
// Define the culture names used to display them.
let cultureNames = [| "en-US"; "fr-FR" |]

for number in numbers do
    printfn $"{Convert.ToString(number, CultureInfo.InvariantCulture)}:"
    for cultureName in cultureNames do
        let culture = CultureInfo cultureName
        printfn $"   {culture.Name}: {Convert.ToString(number, culture),20}"
    printfn ""
// The example displays the following output:
//       12:
//          en-US:                   12
//          fr-FR:                   12
//
//       100:
//          en-US:                  100
//          fr-FR:                  100
//
//       255:
//          en-US:                  255
//          fr-FR:                  255
' Define an array of numbers to display.
Dim numbers() As Byte = { 12, 100, Byte.MaxValue }
' Define the culture names used to display them.
Dim cultureNames() As String = { "en-US", "fr-FR" }

For Each number As Byte In numbers
   Console.WriteLine("{0}:", Convert.ToString(number, _
                             System.Globalization.CultureInfo.InvariantCulture))
   For Each cultureName As String In cultureNames
      Dim culture As New System.Globalization.CultureInfo(cultureName)
      Console.WriteLine("   {0}: {1,20}", _
                        culture.Name, Convert.ToString(number, culture))
   Next
   Console.WriteLine()
Next   
' The example displays the following output:
'       12:
'          en-US:                   12
'          fr-FR:                   12
'       
'       100:
'          en-US:                  100
'          fr-FR:                  100
'       
'       255:
'          en-US:                  255
'          fr-FR:                  255

注釈

この実装は次と Byte.ToString同じです。

適用対象

ToString(Boolean)

指定したブール値を、それと等しい文字列形式に変換します。

public:
 static System::String ^ ToString(bool value);
public static string ToString (bool value);
static member ToString : bool -> string
Public Shared Function ToString (value As Boolean) As String

パラメーター

value
Boolean

変換するブール値。

戻り値

String

value の文字列形式。

次の例は、a から a Boolean StringToStringへの変換を示しています。 また、変換によって返される文字列がどちらかBoolean.TrueStringBoolean.FalseStringまたは等しいことを示します。

bool falseFlag = false;
bool trueFlag = true;

Console.WriteLine(Convert.ToString(falseFlag));
Console.WriteLine(Convert.ToString(falseFlag).Equals(Boolean.FalseString));
Console.WriteLine(Convert.ToString(trueFlag));
Console.WriteLine(Convert.ToString(trueFlag).Equals(Boolean.TrueString));
// The example displays the following output:
//       False
//       True
//       True
//       True
let falseFlag = false
let trueFlag = true

printfn $"{Convert.ToString falseFlag}"
printfn $"{Convert.ToString(falseFlag).Equals Boolean.FalseString}"
printfn $"{Convert.ToString trueFlag}"
printfn $"{Convert.ToString(trueFlag).Equals(Boolean.TrueString)}"
// The example displays the following output:
//       False
//       True
//       True
//       True
Dim falseFlag As Boolean = False
Dim trueFlag As Boolean = True

Console.WriteLine(Convert.ToString(falseFlag))
Console.WriteLine(Convert.ToString(falseFlag).Equals(Boolean.FalseString))
Console.WriteLine(Convert.ToString(trueFlag))
Console.WriteLine(Convert.ToString(trueFlag).Equals(Boolean.TrueString))
' The example displays the following output:
'       False
'       True
'       True
'       True
let falseFlag = false
let trueFlag = true

Console.WriteLine (Convert.ToString falseFlag)
Console.WriteLine (Convert.ToString falseFlag=Boolean.FalseString)
Console.WriteLine (Convert.ToString trueFlag)
Console.WriteLine (Convert.ToString trueFlag=Boolean.TrueString)
// The example displays the following output:
//       False
//       True
//       True
//       True

注釈

この実装は次と Boolean.ToString同じです。 値とBoolean.FalseString値に対falseしてtrueBoolean.TrueStringされます。

適用対象

ToString(Byte)

指定した 8 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::Byte value);
public static string ToString (byte value);
static member ToString : byte -> string
Public Shared Function ToString (value As Byte) As String

パラメーター

value
Byte

変換する 8 ビット符号なし整数。

戻り値

String

value の文字列形式。

次の例では、配列内の各値を Byte 文字列に変換します。

using System;

public class Example
{
   public static void Main()
   {
      byte[] values = { Byte.MinValue, 12, 100, 179, Byte.MaxValue } ;

      foreach (var value in values)
         Console.WriteLine("{0,3} ({1}) --> {2}", value,
                           value.GetType().Name,
                           Convert.ToString(value));
   }
}
// The example displays the following output:
//       0 (Byte) --> 0
//      12 (Byte) --> 12
//     100 (Byte) --> 100
//     179 (Byte) --> 179
//     255 (Byte) --> 255
open System

let values = 
   [| Byte.MinValue; 12uy; 100uy; 179uy; Byte.MaxValue |]

for value in values do
   printfn $"{value,3} ({value.GetType().Name}) --> {Convert.ToString value}"
                     
// The example displays the following output:
//       0 (Byte) --> 0
//      12 (Byte) --> 12
//     100 (Byte) --> 100
//     179 (Byte) --> 179
//     255 (Byte) --> 255
Public Module Example
   Public Sub Main()
      Dim values() As Byte = { Byte.MinValue, 12, 100, 179, Byte.MaxValue }

      For Each value In values
         Console.WriteLine("{0,3} ({1}) --> {2}", value, 
                           value.GetType().Name, 
                           Convert.ToString(value))
      Next                           
   End Sub
End Module
' The example displays the following output:
'       0 (Byte) --> 0
'      12 (Byte) --> 12
'     100 (Byte) --> 100
'     179 (Byte) --> 179
'     255 (Byte) --> 255
let values = [ Byte.MinValue; 12uy; 100uy; 179uy; Byte.MaxValue ]
for value in values do
    printfn "% 4i (%s) --> %s" value (value.GetType().Name) (Convert.ToString value)
// The example displays the following output:
//       0 (Byte) --> 0
//      12 (Byte) --> 12
//     100 (Byte) --> 100
//     179 (Byte) --> 179
//     255 (Byte) --> 255

注釈

この実装は次と Byte.ToString()同じです。

適用対象

ToString(Char)

指定した Unicode 文字の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(char value);
public static string ToString (char value);
static member ToString : char -> string
Public Shared Function ToString (value As Char) As String

パラメーター

value
Char

変換する Unicode 文字。

戻り値

String

value の文字列形式。

次の例では、a を String.Char

public:
   void ConvertStringChar( String^ stringVal )
   {
      Char charVal = 'a';
      
      // A String must be one character long to convert to char.
      try
      {
         charVal = System::Convert::ToChar( stringVal );
         System::Console::WriteLine( " {0} as a char is {1}",
            stringVal, charVal );
      }
      catch ( System::FormatException^ ) 
      {
         System::Console::WriteLine(
            "The String is longer than one character." );
      }
      catch ( System::ArgumentNullException^ ) 
      {
         System::Console::WriteLine( "The String is 0." );
      }
      
      // A char to String conversion will always succeed.
      stringVal = System::Convert::ToString( charVal );
      System::Console::WriteLine( "The character as a String is {0}",
         stringVal );
   }
public void ConvertStringChar(string stringVal) {
    char charVal = 'a';

    // A string must be one character long to convert to char.
    try {
        charVal = System.Convert.ToChar(stringVal);
        System.Console.WriteLine("{0} as a char is {1}",
            stringVal, charVal);
    }
    catch (System.FormatException) {
        System.Console.WriteLine(
            "The string is longer than one character.");
    }
    catch (System.ArgumentNullException) {
        System.Console.WriteLine("The string is null.");
    }

    // A char to string conversion will always succeed.
    stringVal = System.Convert.ToString(charVal);
    System.Console.WriteLine("The character as a string is {0}",
            stringVal);
}
let convertStringChar (stringVal: string) =
    let charVal = 'a'

    // A string must be one character long to convert to char.
    try
        let charVal = Convert.ToChar stringVal
        printfn $"{stringVal} as a char is {charVal}"
    with
    | :? FormatException ->
        printfn "The string is longer than one character."
    | :? ArgumentNullException ->
        printfn "The string is null."

    // A char to string conversion will always succeed.
    let stringVal = Convert.ToString charVal
    printfn $"The character as a string is {stringVal}"
Public Sub ConvertStringChar(ByVal stringVal As String)
    Dim charVal As Char = "a"c

    ' A string must be one character long to convert to char.
    Try
        charVal = System.Convert.ToChar(stringVal)
        System.Console.WriteLine("{0} as a char is {1}", _
                                  stringVal, charVal)
    Catch exception As System.FormatException
        System.Console.WriteLine( _
         "The string is longer than one character.")
    Catch exception As System.ArgumentNullException
        System.Console.WriteLine("The string is null.")
    End Try

    ' A char to string conversion will always succeed.
    stringVal = System.Convert.ToString(charVal)
    System.Console.WriteLine("The character as a string is {0}", _
                              stringVal)
End Sub

注釈

この実装は次と Char.ToString同じです。

適用対象

ToString(DateTime)

指定した DateTime の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(DateTime value);
public static string ToString (DateTime value);
static member ToString : DateTime -> string
Public Shared Function ToString (value As DateTime) As String

パラメーター

value
DateTime

変換する日時の値。

戻り値

String

value の文字列形式。

次の例では、値の配列内の各要素を DateTime 値に String 変換します。

DateTime[] dates = { new DateTime(2009, 7, 14),
                     new DateTime(1, 1, 1, 18, 32, 0),
                     new DateTime(2009, 2, 12, 7, 16, 0) };
string result;

foreach (DateTime dateValue in dates)
{
   result = Convert.ToString(dateValue);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        dateValue.GetType().Name, dateValue,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the DateTime value 7/14/2009 12:00:00 AM to a String value 7/14/2009 12:00:00 AM.
//    Converted the DateTime value 1/1/0001 06:32:00 PM to a String value 1/1/0001 06:32:00 PM.
//    Converted the DateTime value 2/12/2009 07:16:00 AM to a String value 2/12/2009 07:16:00 AM.
let dates =
    [| DateTime(2009, 7, 14)
       DateTime(1, 1, 1, 18, 32, 0)
       DateTime(2009, 2, 12, 7, 16, 0) |]

for dateValue in dates do
    let result = Convert.ToString dateValue
    printfn $"Converted the {dateValue.GetType().Name} value {dateValue} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the DateTime value 7/14/2009 12:00:00 AM to a String value 7/14/2009 12:00:00 AM.
//    Converted the DateTime value 1/1/0001 06:32:00 PM to a String value 1/1/0001 06:32:00 PM.
//    Converted the DateTime value 2/12/2009 07:16:00 AM to a String value 2/12/2009 07:16:00 AM.
Dim dates() As Date = { #07/14/2009#, #6:32PM#, #02/12/2009 7:16AM#}
Dim result As String

For Each dateValue As Date In dates
   result = Convert.ToString(dateValue)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        dateValue.GetType().Name, dateValue, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the DateTime value 7/14/2009 12:00:00 AM to a String value 7/14/2009 12:00:00 AM.
'    Converted the DateTime value 1/1/0001 06:32:00 PM to a String value 1/1/0001 06:32:00 PM.
'    Converted the DateTime value 2/12/2009 07:16:00 AM to a String value 2/12/2009 07:16:00 AM.

注釈

この実装は次と DateTime.ToString()同じです。 現在のカルチャの書式設定規則と "G" 書式指定子を使用して、値を文字列形式に変換 DateTime します。

適用対象

ToString(Double)

指定した倍精度浮動小数点数値を等価の文字列形表記に変換します。

public:
 static System::String ^ ToString(double value);
public static string ToString (double value);
static member ToString : double -> string
Public Shared Function ToString (value As Double) As String

パラメーター

value
Double

変換する倍精度浮動小数点数。

戻り値

String

value の文字列形式。

次の例では、a を String.Double

public:
   void ConvertDoubleString( double doubleVal )
   {
      String^ stringVal;
      
      // A conversion from Double to String cannot overflow.
      stringVal = System::Convert::ToString( doubleVal );
      System::Console::WriteLine( " {0} as a String is: {1}",
         doubleVal, stringVal );
      try
      {
         doubleVal = System::Convert::ToDouble( stringVal );
         System::Console::WriteLine( " {0} as a double is: {1}",
         stringVal, doubleVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine( "Conversion from String-to-double overflowed." );
      }
      catch ( System::FormatException^ ) 
      {
         System::Console::WriteLine( "The String was not formatted as a double." );
      }
      catch ( System::ArgumentException^ ) 
      {
         System::Console::WriteLine( "The String pointed to null." );
      }
   }
public void ConvertDoubleString(double doubleVal) {
    
    string	stringVal;

    // A conversion from Double to string cannot overflow.
    stringVal = System.Convert.ToString(doubleVal);
    System.Console.WriteLine("{0} as a string is: {1}",
        doubleVal, stringVal);

    try {
        doubleVal = System.Convert.ToDouble(stringVal);
        System.Console.WriteLine("{0} as a double is: {1}",
            stringVal, doubleVal);
    }
    catch (System.OverflowException) {
        System.Console.WriteLine(
            "Conversion from string-to-double overflowed.");
    }
    catch (System.FormatException) {
        System.Console.WriteLine(
            "The string was not formatted as a double.");
    }
    catch (System.ArgumentException) {
        System.Console.WriteLine(
            "The string pointed to null.");
    }
}
let convertDoubleString (doubleVal: float) =
    // A conversion from Double to string cannot overflow.
    let stringVal = Convert.ToString doubleVal
    printfn $"{doubleVal} as a string is: {stringVal}"

    try
        let doubleVal = Convert.ToDouble stringVal
        printfn $"{stringVal} as a double is: {doubleVal}"
    with
    | :? OverflowException ->
        printfn "Conversion from string-to-double overflowed."
    | :? FormatException ->
        printfn "The string was not formatted as a double."
    | :? ArgumentException ->
        printfn "The string pointed to null."
Public Sub ConvertDoubleString(ByVal doubleVal As Double)

    Dim stringVal As String

    ' A conversion from Double to String cannot overflow.       
    stringVal = System.Convert.ToString(doubleVal)
    System.Console.WriteLine("{0} as a String is: {1}", _
                              doubleVal, stringVal)

    Try
        doubleVal = System.Convert.ToDouble(stringVal)
        System.Console.WriteLine("{0} as a Double is: {1}", _
                                  stringVal, doubleVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in String-to-Double conversion.")
    Catch exception As System.FormatException
        System.Console.WriteLine( _
            "The string is not formatted as a Double.")
    Catch exception As System.ArgumentException
        System.Console.WriteLine("The string is null.")
    End Try

End Sub

注釈

この実装は次と Double.ToString()同じです。

適用対象

ToString(Int16)

指定した 16 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(short value);
public static string ToString (short value);
static member ToString : int16 -> string
Public Shared Function ToString (value As Short) As String

パラメーター

value
Int16

変換する 16 ビット符号付き整数。

戻り値

String

value の文字列形式。

次の例では、16 ビット整数の配列内の各要素を等価の文字列表現に変換します。

short[] numbers = { Int16.MinValue, -138, 0, 19, Int16.MaxValue };
string result;

foreach (short number in numbers)
{
   result = Convert.ToString(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the Int16 value -32768 to the String value -32768.
//    Converted the Int16 value -138 to the String value -138.
//    Converted the Int16 value 0 to the String value 0.
//    Converted the Int16 value 19 to the String value 19.
//    Converted the Int16 value 32767 to the String value 32767.
let numbers = [| Int16.MinValue; -138s; 0s; 19s; Int16.MaxValue |]

for number in numbers do
    let result = Convert.ToString number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Int16 value -32768 to the String value -32768.
//    Converted the Int16 value -138 to the String value -138.
//    Converted the Int16 value 0 to the String value 0.
//    Converted the Int16 value 19 to the String value 19.
//    Converted the Int16 value 32767 to the String value 32767.
Dim numbers() As Short = { Int16.MinValue, -138, 0, 19, Int16.MaxValue }
Dim result As String

For Each number As Short In numbers
   result = Convert.ToString(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next     
' The example displays the following output:
'    Converted the Int16 value -32768 to the String value -32768.
'    Converted the Int16 value -138 to the String value -138.
'    Converted the Int16 value 0 to the String value 0.
'    Converted the Int16 value 19 to the String value 19.
'    Converted the Int16 value 32767 to the String value 32767.

注釈

この実装は次と Int16.ToString()同じです。

適用対象

ToString(Int32)

指定した 32 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(int value);
public static string ToString (int value);
static member ToString : int -> string
Public Shared Function ToString (value As Integer) As String

パラメーター

value
Int32

変換する 32 ビット符号付き整数。

戻り値

String

value の文字列形式。

次の例では、メソッドとメソッドをToString(Int32)ToString(UInt16, IFormatProvider)比較します。 sting "マイナス" を使用して負の符号を表すカスタム NumberFormatInfo オブジェクトを定義します。 既定の書式設定 (現在のカルチャの書式設定規則) とカスタム書式プロバイダーを使用して、整数配列内の各要素を等価の文字列形式に変換します。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      // Create a NumberFormatInfo object and set its NegativeSigns
      // property to use for integer formatting.
      NumberFormatInfo provider = new NumberFormatInfo();
      provider.NegativeSign = "minus ";

      int[] values = { -20, 0, 100 };

      Console.WriteLine("{0,-8} --> {1,10} {2,10}\n", "Value",
                         CultureInfo.CurrentCulture.Name,
                         "Custom");
      foreach (int value in values)
         Console.WriteLine("{0,-8} --> {1,10} {2,10}",
                           value, Convert.ToString(value),
                           Convert.ToString(value, provider));
      // The example displays output like the following:
      //       Value    -->      en-US     Custom
      //
      //       -20      -->        -20   minus 20
      //       0        -->          0          0
      //       100      -->        100        100
   }
}
open System
open System.Globalization

// Create a NumberFormatInfo object and set its NegativeSigns
// property to use for integer formatting.
let provider = NumberFormatInfo()
provider.NegativeSign <- "minus "

let values = [| -20; 0; 100 |]

printfn $"""{CultureInfo.CurrentCulture.Name,-8} --> {"Value",10} {"Custom",10}\n"""
                    
for value in values do
    printfn $"{value,-8} --> {Convert.ToString value,10} {Convert.ToString(value, provider),10}"
// The example displays output like the following:
//       Value    -->      en-US     Custom
//
//       -20      -->        -20   minus 20
//       0        -->          0          0
//       100      -->        100        100
Imports System.Globalization

Module Example
   Public Sub Main()
      ' Create a NumberFormatInfo object and set its NegativeSigns
      ' property to use for integer formatting.
      Dim provider As New NumberFormatInfo()
      provider.NegativeSign = "minus "

      Dim values() As Integer = { -20, 0, 100 }

      Console.WriteLine("{0,-8} --> {1,10} {2,10}", "Value",
                         CultureInfo.CurrentCulture.Name,
                         "Custom")
      Console.WriteLine()
      For Each value As Integer In values
         Console.WriteLine("{0,-8} --> {1,10} {2,10}",
                           value, Convert.ToString(value),
                           Convert.ToString(value, provider))
      Next
   End Sub
End Module
' The example displays output like the following:
'       Value    -->      en-US     Custom
'
'       -20      -->        -20   minus 20
'       0        -->          0          0
'       100      -->        100        100

注釈

この実装は次と Int32.ToString()同じです。 value現在のカルチャの書式設定規則を使用して書式を設定します。

適用対象

ToString(Decimal)

指定した 10 進数値を、それと等しい文字列形式に変換します。

public:
 static System::String ^ ToString(System::Decimal value);
public static string ToString (decimal value);
static member ToString : decimal -> string
Public Shared Function ToString (value As Decimal) As String

パラメーター

value
Decimal

変換する 10 進数。

戻り値

String

value の文字列形式。

次の例では、a を String.Decimal

public:
   void ConvertStringDecimal( String^ stringVal )
   {
      Decimal decimalVal = 0;

      try
      {
         decimalVal = System::Convert::ToDecimal( stringVal );
         System::Console::WriteLine( "The String as a decimal is {0}.",
         decimalVal );
      }
      catch ( System::OverflowException^ ) 
      {
         System::Console::WriteLine(
            "The conversion from String to decimal overflowed." );
      }
      catch ( System::FormatException^ ) 
      {
         System::Console::WriteLine(
            "The String is not formatted as a decimal." );
      }
      catch ( System::ArgumentNullException^ ) 
      {
         System::Console::WriteLine( "The String is 0." );
      }
      
      // Decimal to String conversion will not overflow.
      stringVal = System::Convert::ToString( decimalVal );
      System::Console::WriteLine(
         "The decimal as a String is {0}.", stringVal );
   }
public void ConvertStringDecimal(string stringVal) {
    decimal decimalVal = 0;
    
    try {
        decimalVal = System.Convert.ToDecimal(stringVal);
        System.Console.WriteLine(
            "The string as a decimal is {0}.", decimalVal);
    }
    catch (System.OverflowException){
        System.Console.WriteLine(
            "The conversion from string to decimal overflowed.");
    }
    catch (System.FormatException) {
        System.Console.WriteLine(
            "The string is not formatted as a decimal.");
    }
    catch (System.ArgumentNullException) {
        System.Console.WriteLine(
            "The string is null.");
    }

    // Decimal to string conversion will not overflow.
    stringVal = System.Convert.ToString(decimalVal);
    System.Console.WriteLine(
        "The decimal as a string is {0}.", stringVal);
}
let convertStringDecimal (stringVal: string) =
    let decimalVal = 0m

    try
        let decimalVal = Convert.ToDecimal(stringVal)
        printfn $"The string as a decimal is {decimalVal}."
    with
    | :? OverflowException ->
        printfn "The conversion from string to decimal overflowed."
    | :? FormatException ->
        printfn "The string is not formatted as a decimal."
    | :? ArgumentNullException ->
        printfn "The string is null."

    // Decimal to string conversion will not overflow.
    let stringVal = Convert.ToString decimalVal
    printfn $"The decimal as a string is {stringVal}."
Public Sub ConvertStringDecimal(ByVal stringVal As String)
    Dim decimalVal As Decimal = 0

    Try
        decimalVal = System.Convert.ToDecimal(stringVal)
        System.Console.WriteLine("The string as a decimal is {0}.", _
                                  decimalVal)
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in string-to-decimal conversion.")
    Catch exception As System.FormatException
        System.Console.WriteLine( _
            "The string is not formatted as a decimal.")
    Catch exception As System.ArgumentException
        System.Console.WriteLine("The string is null.")
    End Try

    ' Decimal to string conversion will not overflow.
    stringVal = System.Convert.ToString(decimalVal)
    System.Console.WriteLine("The decimal as a string is {0}.", _
                              stringVal)
End Sub

注釈

この実装は次と Decimal.ToString()同じです。

適用対象

ToString(Object)

指定したオブジェクトの値を等価の文字列表記に変換します。

public:
 static System::String ^ ToString(System::Object ^ value);
public static string ToString (object value);
public static string? ToString (object? value);
static member ToString : obj -> string
Public Shared Function ToString (value As Object) As String

パラメーター

value
Object

変換する値を提供するオブジェクト、または null

戻り値

String

value の文字列形式。valuenull の場合は Empty

次の例では、オブジェクト配列内の各要素を同等の文字列表現に変換します。

object[] values = { false, 12.63m, new DateTime(2009, 6, 1, 6, 32, 15), 16.09e-12,
                    'Z', 15.15322, SByte.MinValue, Int32.MaxValue };
string result;

foreach (object value in values)
{
   result = Convert.ToString(value);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the Boolean value False to the String value False.
//    Converted the Decimal value 12.63 to the String value 12.63.
//    Converted the DateTime value 6/1/2009 06:32:15 AM to the String value 6/1/2009 06:32:15 AM.
//    Converted the Double value 1.609E-11 to the String value 1.609E-11.
//    Converted the Char value Z to the String value Z.
//    Converted the Double value 15.15322 to the String value 15.15322.
//    Converted the SByte value -128 to the String value -128.
//    Converted the Int32 value 2147483647 to the String value 2147483647.
let values: obj[] =
    [| false; 12.63m; DateTime(2009, 6, 1, 6, 32, 15)
       16.09e-12; 'Z'; 15.15322; SByte.MinValue; Int32.MaxValue |]

for value in values do
    let result = Convert.ToString value
    printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Boolean value False to the String value False.
//    Converted the Decimal value 12.63 to the String value 12.63.
//    Converted the DateTime value 6/1/2009 06:32:15 AM to the String value 6/1/2009 06:32:15 AM.
//    Converted the Double value 1.609E-11 to the String value 1.609E-11.
//    Converted the Char value Z to the String value Z.
//    Converted the Double value 15.15322 to the String value 15.15322.
//    Converted the SByte value -128 to the String value -128.
//    Converted the Int32 value 2147483647 to the String value 2147483647.
Dim values() As Object = { False, 12.63d, #06/01/2009 6:32:15#, 16.09e-12, _
                           "Z"c, 15.15322, SByte.MinValue, Int32.MaxValue}
Dim result As String

For Each value As Object In values
   result = Convert.ToString(value)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the Boolean value False to the String value False.
'    Converted the Decimal value 12.63 to the String value 12.63.
'    Converted the DateTime value 6/1/2009 06:32:15 AM to the String value 6/1/2009 06:32:15 AM.
'    Converted the Double value 1.609E-11 to the String value 1.609E-11.
'    Converted the Char value Z to the String value Z.
'    Converted the Double value 15.15322 to the String value 15.15322.
'    Converted the SByte value -128 to the String value -128.
'    Converted the Int32 value 2147483647 to the String value 2147483647.

注釈

このメソッドは、文字列形式に変換valueするためにIConvertible.ToStringvalue、 . インターフェイスをIConvertible実装しない場合value、メソッドIFormattable.ToStringvalueは . 値がインターフェイスをIFormattable実装していない場合、メソッドは基になる型のvalueメソッドを呼び出しますToString

適用対象

ToString(SByte)

重要

この API は CLS 準拠ではありません。

指定した 8 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::SByte value);
[System.CLSCompliant(false)]
public static string ToString (sbyte value);
[<System.CLSCompliant(false)>]
static member ToString : sbyte -> string
Public Shared Function ToString (value As SByte) As String

パラメーター

value
SByte

変換する 8 ビット符号付き整数。

戻り値

String

value の文字列形式。

属性

次の例では、符号付きバイト配列内の各要素を等価の文字列形式に変換します。

sbyte[] numbers = { SByte.MinValue, -12, 0, 16, SByte.MaxValue };
string result;

foreach (sbyte number in numbers)
{
   result = Convert.ToString(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the SByte value -128 to the String value -128.
//    Converted the SByte value -12 to the String value -12.
//    Converted the SByte value 0 to the String value 0.
//    Converted the SByte value 16 to the String value 16.
//    Converted the SByte value 127 to the String value 127.
let numbers = [| SByte.MinValue; -12y; 0y; 16y; SByte.MaxValue |]

for number in numbers do
    let result = Convert.ToString number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the SByte value -128 to the String value -128.
//    Converted the SByte value -12 to the String value -12.
//    Converted the SByte value 0 to the String value 0.
//    Converted the SByte value 16 to the String value 16.
//    Converted the SByte value 127 to the String value 127.
Dim numbers() As SByte = { SByte.MinValue, -12, 0, 16, SByte.MaxValue }
Dim result As String

For Each number As SByte In numbers
   result = Convert.ToString(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the SByte value -128 to the String value -128.
'    Converted the SByte value -12 to the String value -12.
'    Converted the SByte value 0 to the String value 0.
'    Converted the SByte value 16 to the String value 16.
'    Converted the SByte value 127 to the String value 127.

注釈

この実装は次と SByte.ToString()同じです。

適用対象

ToString(Single)

指定した単精度浮動小数点数値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(float value);
public static string ToString (float value);
static member ToString : single -> string
Public Shared Function ToString (value As Single) As String

パラメーター

value
Single

変換する単精度浮動小数点数。

戻り値

String

value の文字列形式。

次の例では、値の配列内の各要素を等価の Single 文字列形式に変換します。

float[] numbers = { Single.MinValue, -1011.351f, -17.45f, -3e-16f,
                    0f, 4.56e-12f, 16.0001f, 10345.1221f, Single.MaxValue };
string result;

foreach (float number in numbers)
{
   result = Convert.ToString(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the Single value -3.402823E+38 to the String value -3.402823E+38.
//    Converted the Single value -1011.351 to the String value -1011.351.
//    Converted the Single value -17.45 to the String value -17.45.
//    Converted the Single value -3E-16 to the String value -3E-16.
//    Converted the Single value 0 to the String value 0.
//    Converted the Single value 4.56E-12 to the String value 4.56E-12.
//    Converted the Single value 16.0001 to the String value 16.0001.
//    Converted the Single value 10345.12 to the String value 10345.12.
//    Converted the Single value 3.402823E+38 to the String value 3.402823E+38.
let numbers = 
    [| Single.MinValue; -1011.351f; -17.45f; -3e-16f; 0f; 4.56e-12f; 16.0001f; 10345.1221f; Single.MaxValue |]

for number in numbers do
    let result = Convert.ToString number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Single value -3.402823E+38 to the String value -3.402823E+38.
//    Converted the Single value -1011.351 to the String value -1011.351.
//    Converted the Single value -17.45 to the String value -17.45.
//    Converted the Single value -3E-16 to the String value -3E-16.
//    Converted the Single value 0 to the String value 0.
//    Converted the Single value 4.56E-12 to the String value 4.56E-12.
//    Converted the Single value 16.0001 to the String value 16.0001.
//    Converted the Single value 10345.12 to the String value 10345.12.
//    Converted the Single value 3.402823E+38 to the String value 3.402823E+38.
Dim numbers() As Single = { Single.MinValue, -1011.351, -17.45, -3e-16, _
                            0, 4.56e-12, 16.0001, 10345.1221, Single.MaxValue }
Dim result As String

For Each number As Single In numbers
   result = Convert.ToString(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next                            
' The example displays the following output:
'    Converted the Single value -3.402823E+38 to the String value -3.402823E+38.
'    Converted the Single value -1011.351 to the String value -1011.351.
'    Converted the Single value -17.45 to the String value -17.45.
'    Converted the Single value -3E-16 to the String value -3E-16.
'    Converted the Single value 0 to the String value 0.
'    Converted the Single value 4.56E-12 to the String value 4.56E-12.
'    Converted the Single value 16.0001 to the String value 16.0001.
'    Converted the Single value 10345.12 to the String value 10345.12.
'    Converted the Single value 3.402823E+38 to the String value 3.402823E+38.

注釈

この実装は次と Single.ToString()同じです。

適用対象

ToString(String)

指定した文字列インスタンスを返します。実際の変換は実行されません。

public:
 static System::String ^ ToString(System::String ^ value);
public static string? ToString (string? value);
public static string ToString (string value);
static member ToString : string -> string
Public Shared Function ToString (value As String) As String

パラメーター

value
String

返される文字列。

戻り値

String

value は変更されずに返されます。

次の例では、メソッドに文字列を ToString(String) 渡し、メソッドを Object.ReferenceEquals 呼び出して、メソッドから元の文字列が返されることを確認します。 この例では、元の文字列が String.IsInterned インターンされているため、2 つの文字列が同一でないことを確認するためにメソッドも呼び出します。

using System;

public class Example
{
   public static void Main()
   {
      String article = "An";
      String noun = "apple";
      String str1 = String.Format("{0} {1}", article, noun);
      String str2 = Convert.ToString(str1);

      Console.WriteLine("str1 is interned: {0}",
                        ! (String.IsInterned(str1) == null));
      Console.WriteLine("str1 and str2 are the same reference: {0}",
                        Object.ReferenceEquals(str1, str2));
   }
}
// The example displays the following output:
//       str1 is interned: False
//       str1 and str2 are the same reference: True
open System

let article = "An"
let noun = "apple"
let str1 = $"{article} {noun}"
let str2 = Convert.ToString str1

printfn $"str1 is interned: {String.IsInterned str1 <> null}"
                  
printfn $"str1 and str2 are the same reference: {Object.ReferenceEquals(str1, str2)}"
// The example displays the following output:
//       str1 is interned: False
//       str1 and str2 are the same reference: True
Module Example
   Public Sub Main()
      Dim article As String = "An"
      Dim noun As String = "apple"
      Dim str1 As String = String.Format("{0} {1}", article, noun)
      Dim str2 As String = Convert.ToString(str1)

      Console.WriteLine("str1 is interned: {0}",
                        Not String.IsInterned(str1) Is Nothing)
      Console.WriteLine("str1 and str2 are the same reference: {0}",
                        Object.ReferenceEquals(str1, str2))
   End Sub
End Module
' The example displays the following output:
'       str1 is interned: False
'       str1 and str2 are the same reference: True

適用対象

ToString(UInt16)

重要

この API は CLS 準拠ではありません。

指定した 16 ビット符号なし整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(System::UInt16 value);
[System.CLSCompliant(false)]
public static string ToString (ushort value);
[<System.CLSCompliant(false)>]
static member ToString : uint16 -> string
Public Shared Function ToString (value As UShort) As String

パラメーター

value
UInt16

変換する 16 ビット符号なし整数。

戻り値

String

value の文字列形式。

属性

次の例では、符号なし 16 ビット整数値の配列内の各要素を等価の文字列表現に変換します。

ushort[] numbers = { UInt16.MinValue, 103, 1045, UInt16.MaxValue };
string result;

foreach (ushort number in numbers)
{
   result = Convert.ToString(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the UInt16 value 0 to the String value 0.
//    Converted the UInt16 value 103 to the String value 103.
//    Converted the UInt16 value 1045 to the String value 1045.
//    Converted the UInt16 value 65535 to the String value 65535.
let numbers = [| UInt16.MinValue; 103us; 1045us; UInt16.MaxValue |]

for number in numbers do
    let result = Convert.ToString number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the UInt16 value 0 to the String value 0.
//    Converted the UInt16 value 103 to the String value 103.
//    Converted the UInt16 value 1045 to the String value 1045.
//    Converted the UInt16 value 65535 to the String value 65535.
Dim numbers() As UShort = { UInt16.MinValue, 103, 1045, UInt16.MaxValue }
Dim result As String

For Each number As UShort In numbers
   result = Convert.ToString(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the UInt16 value 0 to the String value 0.
'    Converted the UInt16 value 103 to the String value 103.
'    Converted the UInt16 value 1045 to the String value 1045.
'    Converted the UInt16 value 65535 to the String value 65535.

注釈

この実装は次と UInt16.ToString()同じです。

適用対象

ToString(Byte, Int32)

8 ビット符号なし整数値を、指定した基数で表される等価な文字列形式に変換します。

public:
 static System::String ^ ToString(System::Byte value, int toBase);
public static string ToString (byte value, int toBase);
static member ToString : byte * int -> string
Public Shared Function ToString (value As Byte, toBase As Integer) As String

パラメーター

value
Byte

変換する 8 ビット符号なし整数。

toBase
Int32

戻り値の基数。これは 2、8、10、16 である必要があります。

戻り値

String

基数 valuetoBase の文字列形式。

例外

toBase が 2、8、10、16 のどれでもありません。

次の例では、バイト配列内の各要素を等価のバイナリ、16 進数、10 進数、および 16 進数の文字列表現に変換します。

int[] bases = { 2, 8, 10, 16};
byte[] numbers = { Byte.MinValue, 12, 103, Byte.MaxValue};

foreach (int baseValue in bases)
{
   Console.WriteLine("Base {0} conversion:", baseValue);
   foreach (byte number in numbers)
   {
      Console.WriteLine("   {0,-5}  -->  0x{1}",
                        number, Convert.ToString(number, baseValue));
   }
}
// The example displays the following output:
//       Base 2 conversion:
//          0      -->  0x0
//          12     -->  0x1100
//          103    -->  0x1100111
//          255    -->  0x11111111
//       Base 8 conversion:
//          0      -->  0x0
//          12     -->  0x14
//          103    -->  0x147
//          255    -->  0x377
//       Base 10 conversion:
//          0      -->  0x0
//          12     -->  0x12
//          103    -->  0x103
//          255    -->  0x255
//       Base 16 conversion:
//          0      -->  0x0
//          12     -->  0xc
//          103    -->  0x67
//          255    -->  0xff
let bases = [| 2; 8; 10; 16 |]
let numbers = [| Byte.MinValue; 12uy; 103uy; Byte.MaxValue |]

for baseValue in bases do
    printfn $"Base {baseValue} conversion:"
    for number in numbers do
        Console.WriteLine("   {0,-5}  -->  0x{1}",
                        number, Convert.ToString(number, baseValue))
// The example displays the following output:
//       Base 2 conversion:
//          0      -->  0x0
//          12     -->  0x1100
//          103    -->  0x1100111
//          255    -->  0x11111111
//       Base 8 conversion:
//          0      -->  0x0
//          12     -->  0x14
//          103    -->  0x147
//          255    -->  0x377
//       Base 10 conversion:
//          0      -->  0x0
//          12     -->  0x12
//          103    -->  0x103
//          255    -->  0x255
//       Base 16 conversion:
//          0      -->  0x0
//          12     -->  0xc
//          103    -->  0x67
//          255    -->  0xff
Dim bases() As Integer = { 2, 8, 10, 16}
Dim numbers() As Byte = { Byte.MinValue, 12, 103, Byte.MaxValue}

For Each base As Integer In bases
   Console.WriteLine("Base {0} conversion:", base)
   For Each number As Byte In numbers
      Console.WriteLine("   {0,-5}  -->  0x{1}", _
                        number, Convert.ToString(number, base))
   Next
Next
' The example displays the following output:
'       Base 2 conversion:
'          0      -->  0x0
'          12     -->  0x1100
'          103    -->  0x1100111
'          255    -->  0x11111111
'       Base 8 conversion:
'          0      -->  0x0
'          12     -->  0x14
'          103    -->  0x147
'          255    -->  0x377
'       Base 10 conversion:
'          0      -->  0x0
'          12     -->  0x12
'          103    -->  0x103
'          255    -->  0x255
'       Base 16 conversion:
'          0      -->  0x0
'          12     -->  0xc
'          103    -->  0x67
'          255    -->  0xff
let bases = [2; 8; 10; 16]
let numbers = [ Byte.MinValue; 12uy; 103uy; Byte.MaxValue ]

for baseValue in bases do
    printfn "Base %i conversion:" baseValue
    for number in numbers do
        printfn "   % -5i  -->  0x%s" number (Convert.ToString (number, baseValue))
// The example displays the following output:
//     Base 2 conversion:
//         0     -->  0x0
//         12    -->  0x1100
//         103   -->  0x1100111
//         255   -->  0x11111111
//     Base 8 conversion:
//         0     -->  0x0
//         12    -->  0x14
//         103   -->  0x147
//         255   -->  0x377
//     Base 10 conversion:
//         0     -->  0x0
//         12    -->  0x12
//         103   -->  0x103
//         255   -->  0x255
//     Base 16 conversion:
//         0     -->  0x0
//         12    -->  0xc
//         103   -->  0x67
//         255   -->  0xff

注釈

10 に等しくない場合 toBase 、メソッドによって Convert.ToString(Byte, Int32) 返される文字列は、その大きさのみで表 value されます。 後で数値に変換される文字列を作成するためにメソッドを呼び出す場合は、変換を実行するために、大きさのみの数値表現を想定した対応するメソッドを呼び出す必要があります。 このような方法には、以下が含まれますConvert.ToByte(String, Int32)Byte.Parse(String, NumberStyles)

適用対象

ToString(Boolean, IFormatProvider)

指定したブール値を、それと等しい文字列形式に変換します。

public:
 static System::String ^ ToString(bool value, IFormatProvider ^ provider);
public static string ToString (bool value, IFormatProvider provider);
public static string ToString (bool value, IFormatProvider? provider);
static member ToString : bool * IFormatProvider -> string
Public Shared Function ToString (value As Boolean, provider As IFormatProvider) As String

パラメーター

value
Boolean

変換するブール値。

provider
IFormatProvider

オブジェクトのインスタンス。 このパラメーターは無視されます。

戻り値

String

value の文字列形式。

次の例では、呼び出される書式プロバイダーの型を表示するオブジェクトをIFormatProvider使用して、メソッドを使用して値ToStringStringを a に変換Booleanします。 この例は、オブジェクトが参照されていないことを IFormatProvider 示しています。

// Example of Convert::ToString( non-numeric types, IFormatProvider ).
using namespace System;
using namespace System::Globalization;

#define null (Object^)0

// An instance of this class can be passed to methods that require 
// an IFormatProvider.
ref class DummyProvider: public IFormatProvider
{
public:

   // Normally, GetFormat returns an object of the requested type
   // (usually itself) if it is able; otherwise, it returns Nothing. 
   virtual Object^ GetFormat( Type^ argType )
   {
      // Here, the type of argType is displayed, and GetFormat
      // always returns Nothing.
      Console::Write( "{0,-40}", argType->ToString() );
      return null;
   }
};

int main()
{
   // Create an instance of the IFormatProvider.
   DummyProvider^ provider = gcnew DummyProvider;
   String^ converted;

   // Convert these values using DummyProvider.
   int Int32A = -252645135;
   double DoubleA = 61680.3855;
   Object^ ObjDouble =  -98765.4321;
   DateTime DayTimeA = DateTime(2001,9,11,13,45,0);
   bool BoolA = true;
   String^ StringA = "Qwerty";
   Char CharA = '$';
   TimeSpan TSpanA = TimeSpan(0,18,0);
   Object^ ObjOther = static_cast<Object^>(provider);
   Console::WriteLine( "This example of "
   "Convert::ToString( non-numeric, IFormatProvider* ) \n"
   "generates the following output. The provider type, "
   "argument type, \nand argument value are displayed." );
   Console::WriteLine( "\nNote: The IFormatProvider object is "
   "not called for Boolean, String, \nChar, TimeSpan, "
   "and non-numeric Object." );

   // The format provider is called for these conversions.
   Console::WriteLine();
   converted = Convert::ToString( Int32A, provider );
   Console::WriteLine( "int      {0}", converted );
   converted = Convert::ToString( DoubleA, provider );
   Console::WriteLine( "double   {0}", converted );
   converted = Convert::ToString( ObjDouble, provider );
   Console::WriteLine( "Object   {0}", converted );
   converted = Convert::ToString( DayTimeA, provider );
   Console::WriteLine( "DateTime {0}", converted );

   // The format provider is not called for these conversions.
   Console::WriteLine();
   converted = Convert::ToString( BoolA, provider );
   Console::WriteLine( "bool     {0}", converted );
   converted = Convert::ToString( StringA, provider );
   Console::WriteLine( "String   {0}", converted );
   converted = Convert::ToString( CharA, provider );
   Console::WriteLine( "Char     {0}", converted );
   converted = Convert::ToString( TSpanA, provider );
   Console::WriteLine( "TimeSpan {0}", converted );
   converted = Convert::ToString( ObjOther, provider );
   Console::WriteLine( "Object   {0}", converted );
}

/*
This example of Convert::ToString( non-numeric, IFormatProvider* )
generates the following output. The provider type, argument type,
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String,
Char, TimeSpan, and non-numeric Object.

System.Globalization.NumberFormatInfo   int      -252645135
System.Globalization.NumberFormatInfo   double   61680.3855
System.Globalization.NumberFormatInfo   Object   -98765.4321
System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM

bool     True
String   Qwerty
Char     $
TimeSpan 00:18:00
Object   DummyProvider
*/
// Example of Convert.ToString( non-numeric types, IFormatProvider ).
using System;
using System.Globalization;

// An instance of this class can be passed to methods that require
// an IFormatProvider.
public class DummyProvider : IFormatProvider
{
    // Normally, GetFormat returns an object of the requested type
    // (usually itself) if it is able; otherwise, it returns Nothing.
    public object GetFormat( Type argType )
    {
        // Here, the type of argType is displayed, and GetFormat
        // always returns Nothing.
        Console.Write( "{0,-40}", argType.ToString( ) );
        return null;
    }
}

class ConvertNonNumericProviderDemo
{
    static void Main( )
    {
        // Create an instance of the IFormatProvider.
        DummyProvider provider = new DummyProvider( );
        string converted;

        // Convert these values using DummyProvider.
        int      Int32A     = -252645135;
        double   DoubleA    = 61680.3855;
        object   ObjDouble  = (object)( -98765.4321 );
        DateTime DayTimeA   = new DateTime( 2001, 9, 11, 13, 45, 0 );

        bool     BoolA      = true;
        string   StringA    = "Qwerty";
        char     CharA      = '$';
        TimeSpan TSpanA     = new TimeSpan( 0, 18, 0 );
        object   ObjOther   = (object)provider;

        Console.WriteLine( "This example of " +
            "Convert.ToString( non-numeric, IFormatProvider ) \n" +
            "generates the following output. The provider type, " +
            "argument type, \nand argument value are displayed." );
        Console.WriteLine( "\nNote: The IFormatProvider object is " +
            "not called for Boolean, String, \nChar, TimeSpan, " +
            "and non-numeric Object." );

        // The format provider is called for these conversions.
        Console.WriteLine( );
        converted = Convert.ToString( Int32A, provider );
        Console.WriteLine( "int      {0}", converted );
        converted = Convert.ToString( DoubleA, provider );
        Console.WriteLine( "double   {0}", converted );
        converted = Convert.ToString( ObjDouble, provider );
        Console.WriteLine( "object   {0}", converted );
        converted = Convert.ToString( DayTimeA, provider );
        Console.WriteLine( "DateTime {0}", converted );

        // The format provider is not called for these conversions.
        Console.WriteLine( );
        converted = Convert.ToString( BoolA, provider );
        Console.WriteLine( "bool     {0}", converted );
        converted = Convert.ToString( StringA, provider );
        Console.WriteLine( "string   {0}", converted );
        converted = Convert.ToString( CharA, provider );
        Console.WriteLine( "char     {0}", converted );
        converted = Convert.ToString( TSpanA, provider );
        Console.WriteLine( "TimeSpan {0}", converted );
        converted = Convert.ToString( ObjOther, provider );
        Console.WriteLine( "object   {0}", converted );
    }
}

/*
This example of Convert.ToString( non-numeric, IFormatProvider )
generates the following output. The provider type, argument type,
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String,
Char, TimeSpan, and non-numeric Object.

System.Globalization.NumberFormatInfo   int      -252645135
System.Globalization.NumberFormatInfo   double   61680.3855
System.Globalization.NumberFormatInfo   object   -98765.4321
System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM

bool     True
string   Qwerty
char     $
TimeSpan 00:18:00
object   DummyProvider

*/
// Example of Convert.ToString(non-numeric types, IFormatProvider).
open System
open System.Globalization

// Create an instance of the IFormatProvider with an object expression.
let provider =
    { new IFormatProvider with
        // Normally, GetFormat returns an object of the requested type
        // (usually itself) if it is able; otherwise, it returns Nothing.
        member _.GetFormat(argType: Type) =
            // Here, the type of argType is displayed, and GetFormat
            // always returns Nothing.
            printf $"{argType,-40}"
            null 
    }

// Convert these values using DummyProvider.
let Int32A     = -252645135
let DoubleA    = 61680.3855
let ObjDouble  = -98765.4321 :> obj
let DayTimeA   = DateTime(2001, 9, 11, 13, 45, 0)

let BoolA      = true
let StringA    = "Qwerty"
let CharA      = '$'
let TSpanA     = TimeSpan(0, 18, 0)
let ObjOther   = provider :> obj

[<EntryPoint>]
let main _ =
    printfn
        """This example of Convert.ToString(non-numeric, IFormatProvider) 
generates the following output. The provider type, argument type, 
and argument value are displayed.

Note: The IFormatProvider object is not called for Boolean, String, 
Char, TimeSpan, and non-numeric Object."""

    // The format provider is called for these conversions.
    printfn ""
    let converted = Convert.ToString(Int32A, provider)
    printfn $"int      {converted}"
    let converted = Convert.ToString(DoubleA, provider)
    printfn $"double   {converted}"
    let converted = Convert.ToString(ObjDouble, provider)
    printfn $"object   {converted}"
    let converted = Convert.ToString(DayTimeA, provider)
    printfn $"DateTime {converted}"

    // The format provider is not called for these conversions.
    printfn ""
    let converted = Convert.ToString(BoolA, provider)
    printfn $"bool     {converted}"
    let converted = Convert.ToString(StringA, provider)
    printfn $"string   {converted}"
    let converted = Convert.ToString(CharA, provider)
    printfn $"char     {converted}"
    let converted = Convert.ToString(TSpanA, provider)
    printfn $"TimeSpan {converted}"
    let converted = Convert.ToString(ObjOther, provider)
    printfn $"object   {converted}"

    0

// This example of Convert.ToString(non-numeric, IFormatProvider)
// generates the following output. The provider type, argument type,
// and argument value are displayed.
//
// Note: The IFormatProvider object is not called for Boolean, String,
// Char, TimeSpan, and non-numeric Object.
//
// System.Globalization.NumberFormatInfo   int      -252645135
// System.Globalization.NumberFormatInfo   double   61680.3855
// System.Globalization.NumberFormatInfo   object   -98765.4321
// System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM
//
// bool     True
// string   Qwerty
// char     $
// TimeSpan 00:18:00
// object   DummyProvider
' Example of Convert.ToString( non-numeric types, IFormatProvider ).
Imports System.Globalization

' An instance of this class can be passed to methods that require 
' an IFormatProvider.
Public Class DummyProvider
    Implements IFormatProvider

    ' Normally, GetFormat returns an object of the requested type
    ' (usually itself) if it is able; otherwise, it returns Nothing. 
    Public Function GetFormat( argType As Type ) As Object _
        Implements IFormatProvider.GetFormat

        ' Here, the type of argType is displayed, and GetFormat
        ' always returns Nothing.
        Console.Write( "{0,-40}", argType.ToString( ) )
        Return Nothing

    End Function 
End Class

Module ConvertNonNumericProviderDemo

    Sub Main( )

        ' Create an instance of the IFormatProvider.
        Dim provider    As New DummyProvider( )
        Dim converted   As String

        ' Convert these values using DummyProvider.
        Dim Int32A      As Integer  = -252645135   
        Dim DoubleA     As Double   = 61680.3855
        Dim ObjDouble   As Object   = CType( -98765.4321, Object )
        Dim DayTimeA    As DateTime = _
                            new DateTime( 2001, 9, 11, 13, 45, 0 )

        Dim BoolA       As Boolean  = True
        Dim StringA     As String   = "Qwerty"
        Dim CharA       As Char     = "$"c
        Dim TSpanA      As TimeSpan = New TimeSpan( 0, 18, 0 )
        Dim ObjOther    As Object   = CType( provider, Object )

        Console.WriteLine( "This example of " & _
            "Convert.ToString( non-numeric, IFormatProvider ) " & _
            vbCrLf & "generates the following output. The " & _
            "provider type, argument type, " & vbCrLf & "and " & _
            "argument value are displayed." )
        Console.WriteLine( vbCrLf & _
            "Note: The IFormatProvider object is not called for " & _
            "Boolean, String, " & vbCrLf & "Char, TimeSpan, " & _
            "and non-numeric Object." )

        ' The format provider is called for these conversions.
        Console.WriteLine( )
        converted =  Convert.ToString( Int32A, provider )
        Console.WriteLine( "Int32    {0}", converted )
        converted =  Convert.ToString( DoubleA, provider )
        Console.WriteLine( "Double   {0}", converted )
        converted =  Convert.ToString( ObjDouble, provider )
        Console.WriteLine( "Object   {0}", converted )
        converted =  Convert.ToString( DayTimeA, provider )
        Console.WriteLine( "DateTime {0}", converted )

        ' The format provider is not called for these conversions.
        Console.WriteLine( )
        converted =  Convert.ToString( BoolA, provider )
        Console.WriteLine( "Boolean  {0}", converted )
        converted =  Convert.ToString( StringA, provider )
        Console.WriteLine( "String   {0}", converted )
        converted =  Convert.ToString( CharA, provider )
        Console.WriteLine( "Char     {0}", converted )
        converted =  Convert.ToString( TSpanA, provider )
        Console.WriteLine( "TimeSpan {0}", converted )
        converted =  Convert.ToString( ObjOther, provider )
        Console.WriteLine( "Object   {0}", converted )

    End Sub
End Module

' This example of Convert.ToString( non-numeric, IFormatProvider )
' generates the following output. The provider type, argument type,
' and argument value are displayed.
'
' Note: The IFormatProvider object is not called for Boolean, String,
' Char, TimeSpan, and non-numeric Object.
' 
' System.Globalization.NumberFormatInfo   Int32    -252645135
' System.Globalization.NumberFormatInfo   Double   61680.3855
' System.Globalization.NumberFormatInfo   Object   -98765.4321
' System.Globalization.DateTimeFormatInfo DateTime 9/11/2001 1:45:00 PM
' 
' Boolean  True
' String   Qwerty
' Char     $
' TimeSpan 00:18:00
' Object   DummyProvider

注釈

この実装は次と Boolean.ToString同じです。 値とBoolean.FalseString値に対falseしてtrueBoolean.TrueStringされます。

適用対象

ToString(Int64)

指定した 64 ビット符号付き整数の値を等価の文字列形式に変換します。

public:
 static System::String ^ ToString(long value);
public static string ToString (long value);
static member ToString : int64 -> string
Public Shared Function ToString (value As Long) As String

パラメーター

value
Int64

変換する 64 ビット符号付き整数。

戻り値

String

value の文字列形式。

次の例では、長整数配列内の各要素を等価の文字列形式に変換します。

// Create a NumberFormatInfo object and set several of its
// properties that control default integer formatting.
System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();
provider.NegativeSign = "minus ";

long[] values = { -200, 0, 1000 };

foreach (long value in values)
   Console.WriteLine("{0,-6}  -->  {1,10}",
                     value, Convert.ToString(value, provider));
// The example displays the following output:
//       -200    -->   minus 200
//       0       -->           0
//       1000    -->        1000
// Create a NumberFormatInfo object and set several of its
// properties that control default integer formatting.
let provider = System.Globalization.NumberFormatInfo()
provider.NegativeSign <- "minus "

let values = [| -200; 0; 1000 |]

for value in values do
    printfn $"{value,-6}  -->  {Convert.ToString(value, provider),10}"
// The example displays the following output:
//       -200    -->   minus 200
//       0       -->           0
//       1000    -->        1000
' Create a NumberFormatInfo object and set several of its
' properties that control default integer formatting.
Dim provider As New System.Globalization.NumberFormatInfo()
provider.NegativeSign = "minus "

Dim values() As Long = { -200, 0, 1000 }

For Each value As Long In values
   Console.WriteLine("{0,-6}  -->  {1,10}", _
                     value, Convert.ToString(value, provider))
Next
' The example displays the following output:
'       -200    -->   minus 200
'       0       -->           0
'       1000    -->        1000

注釈

この実装は次と Int64.ToString()同じです。

適用対象