Convert.ToSingle メソッド

リファレンス

定義

名前空間:: System

アセンブリ:: System.Runtime.Extensions.dll

アセンブリ:: System.Runtime.dll

アセンブリ:: mscorlib.dll

アセンブリ:: netstandard.dll

重要

一部の情報は、リリース前に大きく変更される可能性があるプレリリースされた製品に関するものです。 Microsoft は、ここに記載されている情報について、明示または黙示を問わず、一切保証しません。

指定した値を単精度浮動小数点数に変換します。

オーバーロード

ToSingle(String, IFormatProvider)	指定したカルチャに固有の書式情報を使用して、指定した数値の文字列形式を等価の単精度浮動小数点数に変換します。
ToSingle(SByte)	指定した 8 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(Object, IFormatProvider)	指定したカルチャに固有の書式情報を使用して、指定したオブジェクトの値を単精度浮動小数点数に変換します。
ToSingle(UInt64)	指定した 64 ビット符号なし整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(UInt32)	指定した 32 ビット符号なし整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(String)	指定した数値の文字列形式を等価の単精度浮動小数点数に変換します。
ToSingle(Single)	指定した単精度浮動小数点数を返します。実際の変換は行われません。
ToSingle(Object)	指定したオブジェクトの値を単精度浮動小数点数に変換します。
ToSingle(UInt16)	指定された 16 ビット符号なし整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(Int32)	指定した 32 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(Int16)	指定した 16 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(Double)	指定した倍精度浮動小数点数値を等価の単精度浮動小数点数に変換します。
ToSingle(Decimal)	指定した 10 進数値を等価の単精度浮動小数点数に変換します。
ToSingle(DateTime)	このメソッドを呼び出すと、必ず InvalidCastException がスローされます。
ToSingle(Char)	このメソッドを呼び出すと、必ず InvalidCastException がスローされます。
ToSingle(Byte)	指定した 8 ビット符号なし整数の値を等価の単精度浮動小数点数に変換します。
ToSingle(Boolean)	指定したブール値を等価の単精度浮動小数点数に変換します。
ToSingle(Int64)	指定した 64 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。

ToSingle(String, IFormatProvider)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

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

public:
 static float ToSingle(System::String ^ value, IFormatProvider ^ provider);

public static float ToSingle (string value, IFormatProvider provider);

public static float ToSingle (string? value, IFormatProvider? provider);

static member ToSingle : string * IFormatProvider -> single

Public Shared Function ToSingle (value As String, provider As IFormatProvider) As Single

パラメーター

value: String

変換する数値を含んだ文字列。

provider: IFormatProvider

カルチャ固有の書式情報を提供するオブジェクト。

戻り値

Single

value の数値と等価の単精度浮動小数点数。value が null の場合は 0 (ゼロ)。

例外

FormatException

value は有効な形式の数値ではありません。

OverflowException

value は、 Single.MinValue より小さいか、 Single.MaxValue より大きい数値を表します。

例

次の例では、数値文字列の配列内の要素を値に変換するときに、en-US カルチャと fr-FR カルチャを表すオブジェクトをSingle使用IFormatProviderします。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] values = { "123456789", "12345.6789", "12 345,6789",
                          "123,456.789", "123 456,789", "123,456,789.0123",
                          "123 456 789,0123", "1.235e12", "1.03221e-05",
                          Double.MaxValue.ToString() };
      CultureInfo[] cultures = { new CultureInfo("en-US"),
                                 new CultureInfo("fr-FR") };

      foreach (CultureInfo culture in cultures)
      {
         Console.WriteLine("String -> Single Conversion Using the {0} Culture",
                           culture.Name);
         foreach (string value in values)
         {
            Console.Write("{0,22}  ->  ", value);
            try {
               Console.WriteLine(Convert.ToSingle(value, culture));
            }
            catch (FormatException) {
               Console.WriteLine("FormatException");
            }
            catch (OverflowException) {
               Console.WriteLine("OverflowException");
            }
         }
         Console.WriteLine();
      }
   }
}
// The example displays the following output:
//    String -> Single Conversion Using the en-US Culture
//                 123456789  ->  1.234568E+08
//                12345.6789  ->  12345.68
//               12 345,6789  ->  FormatException
//               123,456.789  ->  123456.8
//               123 456,789  ->  FormatException
//          123,456,789.0123  ->  1.234568E+08
//          123 456 789,0123  ->  FormatException
//                  1.235e12  ->  1.235E+12
//               1.03221e-05  ->  1.03221E-05
//     1.79769313486232E+308  ->  Overflow
//
//    String -> Single Conversion Using the fr-FR Culture
//                 123456789  ->  1.234568E+08
//                12345.6789  ->  FormatException
//               12 345,6789  ->  12345.68
//               123,456.789  ->  FormatException
//               123 456,789  ->  123456.8
//          123,456,789.0123  ->  FormatException
//          123 456 789,0123  ->  1.234568E+08
//                  1.235e12  ->  FormatException
//               1.03221e-05  ->  FormatException
//     1.79769313486232E+308  ->  FormatException

open System
open System.Globalization

let values =
    [| "123456789"; "12345.6789"; "12 345,6789"
       "123,456.789"; "123 456,789"; "123,456,789.0123"
       "123 456 789,0123"; "1.235e12"; "1.03221e-05"
       string Double.MaxValue |]
let cultures =
    [| CultureInfo "en-US"; CultureInfo "fr-FR" |]

for culture in cultures do
    printfn $"String -> Single Conversion Using the {culture.Name} Culture"
    for value in values do
        printf $"{value,22}  ->  "
        try
            printfn $"{Convert.ToSingle(value, culture)}"
        with
        | :? FormatException ->
            printfn "FormatException"
        | :? OverflowException ->
            printfn "OverflowException"
    printfn ""
// The example displays the following output:
//    String -> Single Conversion Using the en-US Culture
//                 123456789  ->  1.234568E+08
//                12345.6789  ->  12345.68
//               12 345,6789  ->  FormatException
//               123,456.789  ->  123456.8
//               123 456,789  ->  FormatException
//          123,456,789.0123  ->  1.234568E+08
//          123 456 789,0123  ->  FormatException
//                  1.235e12  ->  1.235E+12
//               1.03221e-05  ->  1.03221E-05
//     1.79769313486232E+308  ->  Overflow
//
//    String -> Single Conversion Using the fr-FR Culture
//                 123456789  ->  1.234568E+08
//                12345.6789  ->  FormatException
//               12 345,6789  ->  12345.68
//               123,456.789  ->  FormatException
//               123 456,789  ->  123456.8
//          123,456,789.0123  ->  FormatException
//          123 456 789,0123  ->  1.234568E+08
//                  1.235e12  ->  FormatException
//               1.03221e-05  ->  FormatException
//     1.79769313486232E+308  ->  FormatException

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim values() As String = { "123456789", "12345.6789", "12 345,6789", _
                                 "123,456.789", "123 456,789", "123,456,789.0123", _
                                 "123 456 789,0123", "1.235e12", "1.03221e-05", _
                                 Double.MaxValue.ToString() }
      Dim cultures() As CultureInfo = { New CultureInfo("en-US"), _
                                        New CultureInfo("fr-FR") } 

      For Each culture As CultureInfo In cultures
         Console.WriteLine("String -> Single Conversion Using the {0} Culture", _
                           culture.Name)
         For Each value As String In values
            Console.Write("{0,22}  ->  ", value)
            Try
               Console.WriteLine(Convert.ToSingle(value, culture))
            Catch e As FormatException
               Console.WriteLine("FormatException")
            CAtch e As OverflowException
               Console.WriteLine("Overflow")
            End Try   
         Next
         Console.WriteLine()
      Next                     
   End Sub
End Module
' The example displays the following output:
'    String -> Single Conversion Using the en-US Culture
'                 123456789  ->  1.234568E+08
'                12345.6789  ->  12345.68
'               12 345,6789  ->  FormatException
'               123,456.789  ->  123456.8
'               123 456,789  ->  FormatException
'          123,456,789.0123  ->  1.234568E+08
'          123 456 789,0123  ->  FormatException
'                  1.235e12  ->  1.235E+12
'               1.03221e-05  ->  1.03221E-05
'     1.79769313486232E+308  ->  Overflow
'    
'    String -> Single Conversion Using the fr-FR Culture
'                 123456789  ->  1.234568E+08
'                12345.6789  ->  FormatException
'               12 345,6789  ->  12345.68
'               123,456.789  ->  FormatException
'               123 456,789  ->  123456.8
'          123,456,789.0123  ->  FormatException
'          123 456 789,0123  ->  1.234568E+08
'                  1.235e12  ->  FormatException
'               1.03221e-05  ->  FormatException
'     1.79769313486232E+308  ->  FormatException

注釈

戻り値は、で valueメソッドを呼び出したSingle.Parse結果です。

provider は、 IFormatProvider オブジェクトを取得するインスタンスです NumberFormatInfo 。オブジェクトは NumberFormatInfo 、の形式に関するカルチャ固有の value情報を提供します。がのnull場合providerは、NumberFormatInfo現在のカルチャのが使用されます。

変換が失敗した場合に例外を処理しない場合は、代わりにメソッドを Single.TryParse 呼び出すことができます。変換が Boolean 成功したか失敗したかを示す値を返します。

適用対象

ToSingle(SByte)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

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単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::SByte value);

[System.CLSCompliant(false)]
public static float ToSingle (sbyte value);

[<System.CLSCompliant(false)>]
static member ToSingle : sbyte -> single

Public Shared Function ToSingle (value As SByte) As Single

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

Single

value と等価の 8 ビット符号付き整数。

属性: CLSCompliantAttribute

例

次の例では、符号付きバイト配列内の各要素を値に Single 変換します。

sbyte[] numbers = { SByte.MinValue, -23, 0, 17, SByte.MaxValue };
float result;

foreach (sbyte number in numbers)
{
   result = Convert.ToSingle(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 Single value -128.
//    Converted the SByte value '-23' to the Single value -23.
//    Converted the SByte value '0' to the Single value 0.
//    Converted the SByte value '17' to the Single value 17.
//    Converted the SByte value '127' to the Single value 127.

let numbers = [| SByte.MinValue; -23y; 0y; 17y; SByte.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle 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 Single value -128.
//    Converted the SByte value '-23' to the Single value -23.
//    Converted the SByte value '0' to the Single value 0.
//    Converted the SByte value '17' to the Single value 17.
//    Converted the SByte value '127' to the Single value 127.

Dim numbers() As SByte = { SByte.MinValue, -23, 0, 17, SByte.MaxValue }
Dim result As Single

For Each number As SByte In numbers
   result = Convert.ToSingle(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 Single value -128.
'    Converted the SByte value '-23' to the Single value -23.
'    Converted the SByte value '0' to the Single value 0.
'    Converted the SByte value '17' to the Single value 17.
'    Converted the SByte value '127' to the Single value 127.

適用対象

ToSingle(Object, IFormatProvider)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定したカルチャに固有の書式情報を使用して、指定したオブジェクトの値を単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::Object ^ value, IFormatProvider ^ provider);

public static float ToSingle (object value, IFormatProvider provider);

public static float ToSingle (object? value, IFormatProvider? provider);

static member ToSingle : obj * IFormatProvider -> single

Public Shared Function ToSingle (value As Object, provider As IFormatProvider) As Single

パラメーター

value: Object

IConvertible インターフェイスを実装するオブジェクト。

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

Single

value と等価の単精度浮動小数点数。value が null の場合は 0。

例外

FormatException

value が適切な形式ではありません。

InvalidCastException

value が IConvertible を実装していません。

OverflowException

value は、 Single.MinValue より小さいか、 Single.MaxValue より大きい数値を表します。

例

次の例では、 Temperature インターフェイスを実装する IConvertible クラスを定義しています。メソッドの実装は、 IConvertible.ToSingle 温度を表すプライベート Single 変数の内部値を返します。

using System;
using System.Globalization;

public class Temperature : IConvertible
{
   private float m_Temp;

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

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

   public float Kelvin
   {
      get { return this.m_Temp + 273.15f; }
   }

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

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

   // IConvertible implementations.
   public TypeCode GetTypeCode()
   {
      return TypeCode.Object;
   }

   public bool ToBoolean(IFormatProvider provider)
   {
      if (m_Temp == 0)
         return false;
      else
         return true;
   }

   public byte ToByte(IFormatProvider provider)
   {
      if (m_Temp < Byte.MinValue || m_Temp > Byte.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Byte type.",
                                                   this.m_Temp));
      else
         return Convert.ToByte(this.m_Temp);
   }

   public char ToChar(IFormatProvider provider)
   {
      throw new InvalidCastException("Temperature to Char conversion is not supported.");
   }

   public DateTime ToDateTime(IFormatProvider provider)
   {
      throw new InvalidCastException("Temperature to DateTime conversion is not supported.");
   }

   public decimal ToDecimal(IFormatProvider provider)
   {
      return Convert.ToDecimal(this.m_Temp);
   }

   public double ToDouble(IFormatProvider provider)
   {
      return Convert.ToDouble(this.m_Temp);
   }

   public short ToInt16(IFormatProvider provider)
   {
      if (this.m_Temp < Int16.MinValue || this.m_Temp > Int16.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int16 type.",
                                                   this.m_Temp));
      else
         return Convert.ToInt16(this.m_Temp);
   }

   public int ToInt32(IFormatProvider provider)
      {
      if (this.m_Temp < Int32.MinValue || this.m_Temp > Int32.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int32 type.",
                                                   this.m_Temp));
      else
         return Convert.ToInt32(this.m_Temp);
   }

   public long ToInt64(IFormatProvider provider)
   {
      if (this.m_Temp < Int64.MinValue || this.m_Temp > Int64.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the Int64 type.",
                                                   this.m_Temp));
      else
         return Convert.ToInt64(this.m_Temp);
   }

   public sbyte ToSByte(IFormatProvider provider)
   {
      if (this.m_Temp < SByte.MinValue || this.m_Temp > SByte.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the SByte type.",
                                                   this.m_Temp));
      else
         return Convert.ToSByte(this.m_Temp);
   }

   public float ToSingle(IFormatProvider provider)
   {
      return this.m_Temp;
   }

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

   public object ToType(Type conversionType, IFormatProvider provider)
   {
      switch (Type.GetTypeCode(conversionType))
      {
         case TypeCode.Boolean:
            return this.ToBoolean(null);
         case TypeCode.Byte:
            return this.ToByte(null);
         case TypeCode.Char:
            return this.ToChar(null);
         case TypeCode.DateTime:
            return this.ToDateTime(null);
         case TypeCode.Decimal:
            return this.ToDecimal(null);
         case TypeCode.Double:
            return this.ToDouble(null);
         case TypeCode.Int16:
            return this.ToInt16(null);
         case TypeCode.Int32:
            return this.ToInt32(null);
         case TypeCode.Int64:
            return this.ToInt64(null);
         case TypeCode.Object:
            if (typeof(Temperature).Equals(conversionType))
               return this;
            else
               throw new InvalidCastException(String.Format("Conversion to a {0} is not supported.",
                                                            conversionType.Name));
         case TypeCode.SByte:
            return this.ToSByte(null);
         case TypeCode.Single:
            return this.ToSingle(null);
         case TypeCode.String:
            return this.ToString(provider);
         case TypeCode.UInt16:
            return this.ToUInt16(null);
         case TypeCode.UInt32:
            return this.ToUInt32(null);
         case TypeCode.UInt64:
            return this.ToUInt64(null);
         default:
            throw new InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name));
      }
   }

   public ushort ToUInt16(IFormatProvider provider)
   {
      if (this.m_Temp < UInt16.MinValue || this.m_Temp > UInt16.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt16 type.",
                                                   this.m_Temp));
      else
         return Convert.ToUInt16(this.m_Temp);
   }

   public uint ToUInt32(IFormatProvider provider)
   {
      if (this.m_Temp < UInt32.MinValue || this.m_Temp > UInt32.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt32 type.",
                                                   this.m_Temp));
      else
         return Convert.ToUInt32(this.m_Temp);
   }

   public ulong ToUInt64(IFormatProvider provider)
   {
      if (this.m_Temp < UInt64.MinValue || this.m_Temp > UInt64.MaxValue)
         throw new OverflowException(String.Format("{0} is out of range of the UInt64 type.",
                                                   this.m_Temp));
      else
         return Convert.ToUInt64(this.m_Temp);
   }
}

open System

type Temperature(temperature: float32) =
    member _.Celsius =
        temperature

    member _.Kelvin =
        temperature + 273.15f

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

    override _.ToString() =
        $"{temperature:N2} °C"

    // IConvertible implementations.
    interface IConvertible with

        member _.GetTypeCode() =
            TypeCode.Object

        member _.ToBoolean(provider: IFormatProvider) =
            temperature <> 0f

        member _.ToByte(provider: IFormatProvider) =
            if temperature < float32 Byte.MinValue || temperature > float32 Byte.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Byte type.")
            else
                Convert.ToByte temperature

        member _.ToChar(provider: IFormatProvider) =
            raise (InvalidCastException "Temperature to Char conversion is not supported.")

        member _.ToDateTime(provider: IFormatProvider) =
            raise (InvalidCastException "Temperature to DateTime conversion is not supported.")

        member _.ToDecimal(provider: IFormatProvider) =
            Convert.ToDecimal temperature

        member _.ToDouble(provider: IFormatProvider) =
            Convert.ToDouble temperature

        member _.ToInt16(provider: IFormatProvider) =
            if temperature < float32 Int16.MinValue || temperature > float32 Int16.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Int16 type.")
            else
                Convert.ToInt16 temperature

        member _.ToInt32(provider: IFormatProvider) =
            if temperature < float32 Int32.MinValue || temperature > float32 Int32.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Int32 type.")
            else
                Convert.ToInt32 temperature

        member _.ToInt64(provider: IFormatProvider) =
            if float32 temperature < float32 Int64.MinValue || temperature > float32 Int64.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the Int64 type.")
            else
                Convert.ToInt64 temperature

        member _.ToSByte(provider: IFormatProvider) =
            if temperature < float32 SByte.MinValue || temperature > float32 SByte.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the SByte type.")
            else
                Convert.ToSByte temperature

        member _.ToSingle(provider: IFormatProvider) =
            temperature

        override _.ToString(provider: IFormatProvider) =
            temperature.ToString("N2", provider) + " °C"

        member this.ToType(conversionType: Type, provider: IFormatProvider) =
            let this = this :> IConvertible
            match Type.GetTypeCode conversionType with
            | TypeCode.Boolean ->
                this.ToBoolean null
            | TypeCode.Byte ->
                this.ToByte null
            | TypeCode.Char ->
                this.ToChar null
            | TypeCode.DateTime ->
                this.ToDateTime null
            | TypeCode.Decimal ->
                this.ToDecimal null
            | TypeCode.Double ->
                this.ToDouble null
            | TypeCode.Int16 ->
                this.ToInt16 null
            | TypeCode.Int32 ->
                this.ToInt32 null
            | TypeCode.Int64 ->
                this.ToInt64 null
            | TypeCode.Object ->
                if typeof<Temperature>.Equals conversionType then
                    this
                else
                    raise (InvalidCastException $"Conversion to a {conversionType.Name} is not supported.")
            | TypeCode.SByte ->
                this.ToSByte null
            | TypeCode.Single ->
                this.ToSingle null
            | TypeCode.String ->
                this.ToString provider
            | TypeCode.UInt16 ->
                this.ToUInt16 null
            | TypeCode.UInt32 ->
                this.ToUInt32 null
            | TypeCode.UInt64 ->
                this.ToUInt64 null
            | _ ->
                    raise (InvalidCastException $"Conversion to {conversionType.Name} is not supported.")

        member _.ToUInt16(provider: IFormatProvider) =
            if temperature < float32 UInt16.MinValue || temperature > float32 UInt16.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the UInt16 type.")
            else
                Convert.ToUInt16 temperature

        member _.ToUInt32(provider: IFormatProvider) =
            if temperature < float32 UInt32.MinValue || temperature > float32 UInt32.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the UInt32 type.")
            else
                Convert.ToUInt32 temperature

        member _.ToUInt64(provider: IFormatProvider) =
            if temperature < float32 UInt64.MinValue || temperature > float32 UInt64.MaxValue then
                raise (OverflowException $"{temperature} is out of range of the UInt64 type.")
            else
                Convert.ToUInt64 temperature

Imports System.Globalization

Public Class Temperature : Implements IConvertible
   Private m_Temp As Single

   Public Sub New(temperature As Single)
      Me.m_Temp = temperature
   End Sub
   
   Public ReadOnly Property Celsius() As Single
      Get
         Return Me.m_Temp
      End Get   
   End Property
   
   Public ReadOnly Property Kelvin() As Single
      Get
         Return Me.m_Temp + 273.15F
      End Get
   End Property
   
   Public ReadOnly Property Fahrenheit() As Single
      Get
         Return CSng(Math.Round(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

   ' IConvertible implementations.
   Public Function GetTypeCode() As TypeCode _
                   Implements IConvertible.GetTypeCode
      Return TypeCode.Object
   End Function
   
   Public Function ToBoolean(provider As IFormatProvider) As Boolean _
                   Implements IConvertible.ToBoolean
      If m_Temp = 0 Then
         Return False
      Else
         Return True
      End If
   End Function 
   
   Public Function ToByte(provider As IFormatProvider) As Byte _
                   Implements IConvertible.ToByte
      If m_Temp < Byte.MinValue Or m_Temp > Byte.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Byte type.", _ 
                                                   Me.m_Temp)) 
      Else
         Return Convert.ToByte(Me.m_Temp)
      End If       
   End Function
   
   Public Function ToChar(provider As IFormatProvider) As Char _
                   Implements IConvertible.ToChar
      Throw New InvalidCastException("Temperature to Char conversion is not supported.")
   End Function 
   
   Public Function ToDateTime(provider As IFormatProvider) As Date _
                   Implements IConvertible.ToDateTime
      Throw New InvalidCastException("Temperature to DateTime conversion is not supported.")
   End Function
   
   Public Function ToDecimal(provider As IFormatProvider) As Decimal _
                   Implements IConvertible.ToDecimal
      Return Convert.ToDecimal(Me.m_Temp)
   End Function
   
   Public Function ToDouble(provider As IFormatProvider) As Double _
                   Implements IConvertible.ToDouble
      Return Convert.ToDouble(Me.m_Temp)
   End Function   
   
   Public Function ToInt16(provider As IFormatProvider) As Int16 _
                   Implements IConvertible.ToInt16
      If Me.m_Temp < Int16.MinValue Or Me.m_Temp > Int16.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int16 type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToInt16(Me.m_Temp)   
      End If
   End Function
   
   Public Function ToInt32(provider As IFormatProvider) As Int32 _
                   Implements IConvertible.ToInt32
      If Me.m_Temp < Int32.MinValue Or Me.m_Temp > Int32.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int32 type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToInt32(Me.m_Temp)
      End If      
   End Function
   
   Public Function ToInt64(provider As IFormatProvider) As Int64 _
                   Implements IConvertible.ToInt64
      If Me.m_Temp < Int64.MinValue Or Me.m_Temp > Int64.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the Int64 type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToInt64(Me.m_Temp)
      End If      
   End Function
   
   Public Function ToSByte(provider As IFormatProvider) As SByte _
                   Implements IConvertible.ToSByte
      If Me.m_Temp < SByte.MinValue Or Me.m_Temp > SByte.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the SByte type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToSByte(Me.m_Temp)
      End If      
   End Function

   Public Function ToSingle(provider As IFormatProvider) As Single _
                   Implements IConvertible.ToSingle
      Return Me.m_Temp
   End Function

   Public Overloads Function ToString(provider As IFormatProvider) As String _
                   Implements IConvertible.ToString
      Return m_Temp.ToString("N2", provider) & " °C"
   End Function
   
   Public Function ToType(conversionType As Type, provider As IFormatProvider) As Object _
                   Implements IConvertible.ToType
      Select Case Type.GetTypeCode(conversionType)
         Case TypeCode.Boolean 
            Return Me.ToBoolean(Nothing)
         Case TypeCode.Byte
            Return Me.ToByte(Nothing)
         Case TypeCode.Char
            Return Me.ToChar(Nothing)
         Case TypeCode.DateTime
            Return Me.ToDateTime(Nothing)
         Case TypeCode.Decimal
            Return Me.ToDecimal(Nothing)
         Case TypeCode.Double
            Return Me.ToDouble(Nothing)
         Case TypeCode.Int16
            Return Me.ToInt16(Nothing)
         Case TypeCode.Int32
            Return Me.ToInt32(Nothing)
         Case TypeCode.Int64
            Return Me.ToInt64(Nothing)
         Case TypeCode.Object
            If GetType(Temperature).Equals(conversionType) Then
               Return Me
            Else
               Throw New InvalidCastException(String.Format("Conversion to a {0} is not supported.", _
                                                            conversionType.Name))
            End If 
         Case TypeCode.SByte
            Return Me.ToSByte(Nothing)
         Case TypeCode.Single
            Return Me.ToSingle(Nothing)
         Case TypeCode.String
            Return Me.ToString(provider)
         Case TypeCode.UInt16
            Return Me.ToUInt16(Nothing)
         Case TypeCode.UInt32
            Return Me.ToUInt32(Nothing)
         Case TypeCode.UInt64
            Return Me.ToUInt64(Nothing)   
         Case Else
            Throw New InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name))   
      End Select
   End Function
   
   Public Function ToUInt16(provider As IFormatProvider) As UInt16 _
                   Implements IConvertible.ToUInt16
      If Me.m_Temp < UInt16.MinValue Or Me.m_Temp > UInt16.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt16 type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToUInt16(Me.m_Temp)
      End If   
   End Function

   Public Function ToUInt32(provider As IFormatProvider) As UInt32 _
                   Implements IConvertible.ToUInt32
      If Me.m_Temp < UInt32.MinValue Or Me.m_Temp > UInt32.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt32 type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToUInt32(Me.m_Temp)
      End If   
   End Function
   
   Public Function ToUInt64(provider As IFormatProvider) As UInt64 _
                   Implements IConvertible.ToUInt64
      If Me.m_Temp < UInt64.MinValue Or Me.m_Temp > UInt64.MaxValue Then
         Throw New OverflowException(String.Format("{0} is out of range of the UInt64 type.", _
                                                   Me.m_Temp))
      Else
         Return Convert.ToUInt64(Me.m_temp)
      End If   
   End Function
End Class

次の例は、メソッドの呼び出しで Convert.ToSingle(Object, IFormatProvider) クラスの実装を IConvertible.ToSingle 呼び出す方法を Temperature 示しています。

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.ToInt32(cold, null));
      Console.WriteLine(Convert.ToInt32(freezing, null));
      Console.WriteLine(Convert.ToDouble(boiling, null));
   }
}
// The example dosplays the following output:
//       -40
//       0
//       100

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

printfn $"{Convert.ToInt32(cold, null)}"
printfn $"{Convert.ToInt32(freezing, null)}"
printfn $"{Convert.ToDouble(boiling, null)}"
// The example dosplays the following output:
//       -40
//       0
//       100

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.ToInt32(cold, Nothing))
      Console.WriteLine(Convert.ToInt32(freezing, Nothing))
      Console.WriteLine(Convert.ToDouble(boiling, Nothing))
   End Sub
End Module
' The example displays the following output:
'       -40
'       0
'       100

注釈

戻り値は、の基になる型valueのメソッドを呼び出IConvertible.ToSingleした結果です。

provider を使用すると、ユーザーはの内容に関するカルチャ固有の value変換情報を指定できます。たとえば、が数値を表すであるString場合value、providerその数値を表すため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。

基本型は無視 providerされます。ただし、がインターフェイスを実装するユーザー定義型の場合 value は、パラメーターを IConvertible 使用できます。

適用対象

ToSingle(UInt64)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

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単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::UInt64 value);

[System.CLSCompliant(false)]
public static float ToSingle (ulong value);

[<System.CLSCompliant(false)>]
static member ToSingle : uint64 -> single

Public Shared Function ToSingle (value As ULong) As Single

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

Single

value と等価の単精度浮動小数点数。

属性: CLSCompliantAttribute

例

次の例では、符号なし long 整数の配列内の各要素を値に Single 変換します。

ulong[] numbers = { UInt64.MinValue, 121, 12345, UInt64.MaxValue };
float result;

foreach (ulong number in numbers)
{
   result = Convert.ToSingle(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 Single value 0.
//    Converted the UInt64 value '121' to the Single value 121.
//    Converted the UInt64 value '12345' to the Single value 12345.
//    Converted the UInt64 value '18446744073709551615' to the Single value 1.844674E+19.

let numbers = [| UInt64.MinValue; 121uL; 12345uL; UInt64.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle 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 Single value 0.
//    Converted the UInt64 value '121' to the Single value 121.
//    Converted the UInt64 value '12345' to the Single value 12345.
//    Converted the UInt64 value '18446744073709551615' to the Single value 1.844674E+19.

Dim numbers() As ULong = { UInt64.MinValue, 121, 12345, UInt64.MaxValue }
Dim result As Single

For Each number As ULong In numbers
   result = Convert.ToSingle(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 Single value 0.
'    Converted the UInt64 value '121' to the Single value 121.
'    Converted the UInt64 value '12345' to the Single value 12345.
'    Converted the UInt64 value '18446744073709551615' to the Single value 1.844674E+19.

適用対象

ToSingle(UInt32)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

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単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::UInt32 value);

[System.CLSCompliant(false)]
public static float ToSingle (uint value);

[<System.CLSCompliant(false)>]
static member ToSingle : uint32 -> single

Public Shared Function ToSingle (value As UInteger) As Single

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

Single

value と等価の単精度浮動小数点数。

属性: CLSCompliantAttribute

例

次の例では、符号なし整数の配列内の各要素を値に Single 変換します。

uint[] numbers = { UInt32.MinValue, 121, 12345, UInt32.MaxValue };
float result;

foreach (uint number in numbers)
{
   result = Convert.ToSingle(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 Single value 0.
//    Converted the UInt32 value '121' to the Single value 121.
//    Converted the UInt32 value '12345' to the Single value 12345.
//    Converted the UInt32 value '4294967295' to the Single value 4.294967E+09.

let numbers = [| UInt32.MinValue; 121u; 12345u; UInt32.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle 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 Single value 0.
//    Converted the UInt32 value '121' to the Single value 121.
//    Converted the UInt32 value '12345' to the Single value 12345.
//    Converted the UInt32 value '4294967295' to the Single value 4.294967E+09.

   Dim numbers() As UInteger = { UInt32.MinValue, 121, 12345, UInt32.MaxValue }
   Dim result As Single

   For Each number As UInteger In numbers
      result = Convert.ToSingle(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 Single value 0.
'    Converted the UInt32 value '121' to the Single value 121.
'    Converted the UInt32 value '12345' to the Single value 12345.
'    Converted the UInt32 value '4294967295' to the Single value 4.294967E+09.

適用対象

ToSingle(String)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した数値の文字列形式を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::String ^ value);

public static float ToSingle (string value);

public static float ToSingle (string? value);

static member ToSingle : string -> single

Public Shared Function ToSingle (value As String) As Single

パラメーター

value: String

変換する数値を含んだ文字列。

戻り値

Single

value の数値と等価の単精度浮動小数点数。value が null の場合は 0 (ゼロ)。

例外

FormatException

value は有効な形式の数値ではありません。

OverflowException

value は、 Single.MinValue より小さいか、 Single.MaxValue より大きい数値を表します。

例

次の例では、数値文字列の配列内の各要素を値に Single 変換しようとしています。

string[] values= { "-1,035.77219", "1AFF", "1e-35", "1.63f",
                   "1,635,592,999,999,999,999,999,999", "-17.455",
                   "190.34001", "1.29e325"};
float result;

foreach (string value in values)
{
   try {
      result = Convert.ToSingle(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (FormatException) {
      Console.WriteLine("Unable to convert '{0}' to a Single.", value);
   }
   catch (OverflowException) {
      Console.WriteLine("'{0}' is outside the range of a Single.", value);
   }
}
// The example displays the following output:
//    Converted the String value '-1,035.77219' to the Single value -1035.772.
//    Unable to convert '1AFF' to a Single.
//    Converted the String value '1e-35' to the Single value 1E-35.
//    Unable to convert '1.63f' to a Single.
//    Converted the String value '1,635,592,999,999,999,999,999,999' to the Single value 1.635593E+24.
//    Converted the String value '-17.455' to the Single value -17.455.
//    Converted the String value '190.34001' to the Single value 190.34.
//    1.29e325' is outside the range of a Single.

let values =
    [| "-1,035.77219"; "1AFF"; "1e-35"; "1.63f"; "1,635,592,999,999,999,999,999,999"
       "-17.455"; "190.34001"; "1.29e325" |]

for value in values do
    try
        let result = Convert.ToSingle value
        printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
    with
    | :? FormatException ->
        printfn $"Unable to convert '{value}' to a Single."
    | :? OverflowException ->
        printfn $"'{value}' is outside the range of a Single."
// The example displays the following output:
//    Converted the String value '-1,035.77219' to the Single value -1035.772.
//    Unable to convert '1AFF' to a Single.
//    Converted the String value '1e-35' to the Single value 1E-35.
//    Unable to convert '1.63f' to a Single.
//    Converted the String value '1,635,592,999,999,999,999,999,999' to the Single value 1.635593E+24.
//    Converted the String value '-17.455' to the Single value -17.455.
//    Converted the String value '190.34001' to the Single value 190.34.
//    1.29e325' is outside the range of a Single.

Dim values() As String = { "-1,035.77219", "1AFF", "1e-35", "1.63f",
                           "1,635,592,999,999,999,999,999,999", "-17.455",
                           "190.34001", "1.29e325"}
Dim result As Single

For Each value As String In values
   Try
      result = Convert.ToSingle(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As FormatException
      Console.WriteLine("Unable to convert '{0}' to a Single.", value)
   Catch e As OverflowException
      Console.WriteLine("'{0}' is outside the range of a Single.", value)
   End Try
Next
' The example displays the following output:
'    Converted the String value '-1,035.77219' to the Single value -1035.772.
'    Unable to convert '1AFF' to a Single.
'    Converted the String value '1e-35' to the Single value 1E-35.
'    Unable to convert '1.63f' to a Single.
'    Converted the String value '1,635,592,999,999,999,999,999,999' to the Single value 1.635593E+24.
'    Converted the String value '-17.455' to the Single value -17.455.
'    Converted the String value '190.34001' to the Single value 190.34.
'    '1.29e325' is outside the range of a Single.

注釈

メソッドの ToSingle(String) 使用は、メソッドに渡すこと value と Single.Parse(String) 同じです。 value は、現在のカルチャの書式設定規則を使用して解釈されます。

適用対象

ToSingle(Single)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した単精度浮動小数点数を返します。実際の変換は行われません。

public:
 static float ToSingle(float value);

public static float ToSingle (float value);

static member ToSingle : single -> single

Public Shared Function ToSingle (value As Single) As Single

パラメーター

value: Single

返される単精度浮動小数点数。

戻り値

Single

value は変更されずに返されます。

こちらもご覧ください

Single

適用対象

ToSingle(Object)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定したオブジェクトの値を単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::Object ^ value);

public static float ToSingle (object value);

public static float ToSingle (object? value);

static member ToSingle : obj -> single

Public Shared Function ToSingle (value As Object) As Single

パラメーター

value: Object

IConvertible インターフェイスを実装するオブジェクトか、または null。

戻り値

Single

value と等価の単精度浮動小数点数。value が null の場合は 0。

例外

FormatException

value が適切な形式ではありません。

InvalidCastException

value が IConvertible インターフェイスを実装していません。

または

この変換はサポートされていません。

OverflowException

value は、 Single.MinValue より小さいか、 Single.MaxValue より大きい数値を表します。

例

次の例では、オブジェクト配列内の各要素を値に Single 変換しようとしています。

object[] values = { true, 'a', 123, 1.764e32, "9.78", "1e-02",
                    1.67e03, "A100", "1,033.67", DateTime.Now,
                    Decimal.MaxValue };
float result;

foreach (object value in values)
{
   try {
      result = Convert.ToSingle(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not recognized as a valid Single value.",
                        value.GetType().Name, value);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Single type.",
                        value.GetType().Name, value);
   }
   catch (InvalidCastException) {
      Console.WriteLine("Conversion of the {0} value {1} to a Single is not supported.",
                        value.GetType().Name, value);
   }
}
// The example displays the following output:
//    Converted the Boolean value 'True' to the Single value 1.
//    Conversion of the Char value a to a Single is not supported.
//    Converted the Int32 value '123' to the Single value 123.
//    Converted the Double value '1.764E+32' to the Single value 1.764E+32.
//    Converted the String value '9.78' to the Single value 9.78.
//    Converted the String value '1e-02' to the Single value 0.01.
//    Converted the Double value '1670' to the Single value 1670.
//    The String value A100 is not recognized as a valid Single value.
//    Converted the String value '1,033.67' to the Single value 1033.67.
//    Conversion of the DateTime value 11/7/2008 08:02:35 AM to a Single is not supported.
//    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.

let values: obj[] =
    [| true; 'a'; 123; 1.764e32; "9.78"; "1e-02"; 1.67e03; "A100"; "1,033.67"; DateTime.Now; Decimal.MaxValue |]

for value in values do
    try
        let result = Convert.ToSingle value            
        printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
    with
    | :? FormatException ->
        printfn $"The {value.GetType().Name} value {value} is not recognized as a valid Single value."
    | :? OverflowException ->
        printfn $"The {value.GetType().Name} value {value} is outside the range of the Single type."
    | :? InvalidCastException ->
        printfn $"Conversion of the {value.GetType().Name} value {value} to a Single is not supported."
// The example displays the following output:
//    Converted the Boolean value 'True' to the Single value 1.
//    Conversion of the Char value a to a Single is not supported.
//    Converted the Int32 value '123' to the Single value 123.
//    Converted the Double value '1.764E+32' to the Single value 1.764E+32.
//    Converted the String value '9.78' to the Single value 9.78.
//    Converted the String value '1e-02' to the Single value 0.01.
//    Converted the Double value '1670' to the Single value 1670.
//    The String value A100 is not recognized as a valid Single value.
//    Converted the String value '1,033.67' to the Single value 1033.67.
//    Conversion of the DateTime value 11/7/2008 08:02:35 AM to a Single is not supported.
//    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.

Dim values() As Object = { True, "a"c, 123, 1.764e32, "9.78", "1e-02", _
                           1.67e03, "A100", "1,033.67", Date.Now, _
                           Decimal.MaxValue }
Dim result As Single

For Each value As Object In values
   Try
      result = Convert.ToSingle(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)

   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not recognized as a valid Single value.", _
                        value.GetType().Name, value)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the Single type.", _
                        value.GetType().Name, value)

   Catch e As InvalidCastException
      Console.WriteLine("Conversion of the {0} value {1} to a Single is not supported.", _
                        value.GetType().Name, value)
   End Try
Next
' The example displays the following output:
'    Converted the Boolean value 'True' to the Single value 1.
'    Conversion of the Char value a to a Single is not supported.
'    Converted the Int32 value '123' to the Single value 123.
'    Converted the Double value '1.764E+32' to the Single value 1.764E+32.
'    Converted the String value '9.78' to the Single value 9.78.
'    Converted the String value '1e-02' to the Single value 0.01.
'    Converted the Double value '1670' to the Single value 1670.
'    The String value A100 is not recognized as a valid Single value.
'    Converted the String value '1,033.67' to the Single value 1033.67.
'    Conversion of the DateTime value 11/7/2008 07:56:24 AM to a Single is not supported.
'    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.

注釈

戻り値は、の基になる型valueの IConvertible.ToSingle メソッドを呼び出した結果です。

適用対象

ToSingle(UInt16)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

重要

この API は CLS 準拠ではありません。

指定された 16 ビット符号なし整数の値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::UInt16 value);

[System.CLSCompliant(false)]
public static float ToSingle (ushort value);

[<System.CLSCompliant(false)>]
static member ToSingle : uint16 -> single

Public Shared Function ToSingle (value As UShort) As Single

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

Single

value と等価の単精度浮動小数点数。

属性: CLSCompliantAttribute

例

次の例では、符号なし 16 ビット整数の配列内の各要素を Single 値に変換します。

ushort[] numbers = { UInt16.MinValue, 121, 12345, UInt16.MaxValue };
float result;

foreach (ushort number in numbers)
{
   result = Convert.ToSingle(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 Single value 0.
//    Converted the UInt16 value '121' to the Single value 121.
//    Converted the UInt16 value '12345' to the Single value 12345.
//    Converted the UInt16 value '65535' to the Single value 65535.

let numbers = [| UInt16.MinValue; 121us; 12345us; UInt16.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle 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 Single value 0.
//    Converted the UInt16 value '121' to the Single value 121.
//    Converted the UInt16 value '12345' to the Single value 12345.
//    Converted the UInt16 value '65535' to the Single value 65535.

Dim numbers() As UShort = { UInt16.MinValue, 121, 12345, UInt16.MaxValue }
Dim result As Single

For Each number As UShort In numbers
   result = Convert.ToSingle(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 Single value 0.
'    Converted the UInt16 value '121' to the Single value 121.
'    Converted the UInt16 value '12345' to the Single value 12345.
'    Converted the UInt16 value '65535' to the Single value 65535.

適用対象

ToSingle(Int32)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した 32 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(int value);

public static float ToSingle (int value);

static member ToSingle : int -> single

Public Shared Function ToSingle (value As Integer) As Single

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

Single

value と等価の単精度浮動小数点数。

例

次の例では、整数配列内の各要素を値に Single 変換します。

int[] numbers = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue };
float result;

foreach (int number in numbers)
{
   result = Convert.ToSingle(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 Int32 value '-2147483648' to the Single value -2.147484E+09.
//    Converted the Int32 value '-1000' to the Single value -1000.
//    Converted the Int32 value '0' to the Single value 0.
//    Converted the Int32 value '1000' to the Single value 1000.
//    Converted the Int32 value '2147483647' to the Single value 2.147484E+09.

let numbers = 
    [| Int32.MinValue; -1000; 0; 1000; Int32.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Int32 value '-2147483648' to the Single value -2.147484E+09.
//    Converted the Int32 value '-1000' to the Single value -1000.
//    Converted the Int32 value '0' to the Single value 0.
//    Converted the Int32 value '1000' to the Single value 1000.
//    Converted the Int32 value '2147483647' to the Single value 2.147484E+09.

Dim numbers() As Integer = { Int32.MinValue, -1000, 0, 1000, Int32.MaxValue }
Dim result As Single

For Each number As Integer In numbers
   result = Convert.ToSingle(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 Int32 value '-2147483648' to the Single value -2.147484E+09.
'    Converted the Int32 value '-1000' to the Single value -1000.
'    Converted the Int32 value '0' to the Single value 0.
'    Converted the Int32 value '1000' to the Single value 1000.
'    Converted the Int32 value '2147483647' to the Single value 2.147484E+09.

適用対象

ToSingle(Int16)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した 16 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(short value);

public static float ToSingle (short value);

static member ToSingle : int16 -> single

Public Shared Function ToSingle (value As Short) As Single

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

Single

value と等価の単精度浮動小数点数。

例

次の例では、16 ビット整数の配列内の各要素を値に Single 変換します。

short[] numbers = { Int16.MinValue, -1032, 0, 192, Int16.MaxValue };
float result;

foreach (short number in numbers)
{
   result = Convert.ToSingle(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 Single value -32768.
//    Converted the Int16 value '-1032' to the Single value -1032.
//    Converted the Int16 value '0' to the Single value 0.
//    Converted the Int16 value '192' to the Single value 192.
//    Converted the Int16 value '32767' to the Single value 32767.

let numbers = 
    [| Int16.MinValue; -1032s; 0s; 192s; Int16.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle 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 Single value -32768.
//    Converted the Int16 value '-1032' to the Single value -1032.
//    Converted the Int16 value '0' to the Single value 0.
//    Converted the Int16 value '192' to the Single value 192.
//    Converted the Int16 value '32767' to the Single value 32767.

Dim numbers() As Short = { Int16.MinValue, -1032, 0, 192, Int16.MaxValue }
Dim result As Single

For Each number As Short In numbers
   result = Convert.ToSingle(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 Single value -32768.
'    Converted the Int16 value '-1032' to the Single value -1032.
'    Converted the Int16 value '0' to the Single value 0.
'    Converted the Int16 value '192' to the Single value 192.
'    Converted the Int16 value '32767' to the Single value 32767.

適用対象

ToSingle(Double)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した倍精度浮動小数点数値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(double value);

public static float ToSingle (double value);

static member ToSingle : double -> single

Public Shared Function ToSingle (value As Double) As Single

パラメーター

value: Double

変換する倍精度浮動小数点数。

戻り値

Single

value と等価の単精度浮動小数点数。

value は近似値に丸められます。たとえば、小数点以下 2 桁に丸められる場合、値 2.345 は 2.34 になり、値 2.355 は 2.36 になります。

例

次の例では、値の配列内の Double 各要素を値に Single 変換します。

double[] values = { Double.MinValue, -1.38e10, -1023.299, -12.98,
                    0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
float result;

foreach (double value in values)
{
   result = Convert.ToSingle(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 Double value '-1.79769313486232E+308' to the Single value -Infinity.
//    Converted the Double value '-13800000000' to the Single value -1.38E+10.
//    Converted the Double value '-1023.299' to the Single value -1023.299.
//    Converted the Double value '-12.98' to the Single value -12.98.
//    Converted the Double value '0' to the Single value 0.
//   Converted the Double value '9.113E-16' to the Single value 9.113E-16.
//    Converted the Double value '103.919' to the Single value 103.919.
//    Converted the Double value '17834.191' to the Single value 17834.19.
//    Converted the Double value '1.79769313486232E+308' to the Single value Infinity.

let values = 
    [| Double.MinValue; -1.38e10; -1023.299; -12.98; 0; 9.113e-16; 103.919; 17834.191; Double.MaxValue |]

for value in values do
    let result = Convert.ToSingle value
    printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Double value '-1.79769313486232E+308' to the Single value -Infinity.
//    Converted the Double value '-13800000000' to the Single value -1.38E+10.
//    Converted the Double value '-1023.299' to the Single value -1023.299.
//    Converted the Double value '-12.98' to the Single value -12.98.
//    Converted the Double value '0' to the Single value 0.
//   Converted the Double value '9.113E-16' to the Single value 9.113E-16.
//    Converted the Double value '103.919' to the Single value 103.919.
//    Converted the Double value '17834.191' to the Single value 17834.19.
//    Converted the Double value '1.79769313486232E+308' to the Single value Infinity.

Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As Single

For Each value As Double In values
   result = Convert.ToSingle(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 Double value '-1.79769313486232E+308' to the Single value -Infinity.
'    Converted the Double value '-13800000000' to the Single value -1.38E+10.
'    Converted the Double value '-1023.299' to the Single value -1023.299.
'    Converted the Double value '-12.98' to the Single value -12.98.
'    Converted the Double value '0' to the Single value 0.
'    Converted the Double value '9.113E-16' to the Single value 9.113E-16.
'    Converted the Double value '103.919' to the Single value 103.919.
'    Converted the Double value '17834.191' to the Single value 17834.19.
'    Converted the Double value '1.79769313486232E+308' to the Single value Infinity.

こちらもご覧ください

Double
Round

適用対象

ToSingle(Decimal)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した 10 進数値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::Decimal value);

public static float ToSingle (decimal value);

static member ToSingle : decimal -> single

Public Shared Function ToSingle (value As Decimal) As Single

パラメーター

value: Decimal

変換する 10 進数。

戻り値

Single

value と等価の単精度浮動小数点数。

value は近似値に丸められます。たとえば、小数点以下 2 桁に丸められる場合、値 2.345 は 2.34 になり、値 2.355 は 2.36 になります。

例

次の例では、値の配列内の Decimal 各要素を値に Single 変換します。

decimal[] values = { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
                            199.55m, 9214.16m, Decimal.MaxValue };
float result;

foreach (var value in values)
{
   result = Convert.ToSingle(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 Decimal value '-79228162514264337593543950335' to the Single value -7.9228163E+28.
//    Converted the Decimal value '-1034.23' to the Single value -1034.23.
//    Converted the Decimal value '-12' to the Single value -12.
//    Converted the Decimal value '0' to the Single value 0.
//    Converted the Decimal value '147' to the Single value 147.
//    Converted the Decimal value '199.55' to the Single value 199.55.
//    Converted the Decimal value '9214.16' to the Single value 9214.16.
//    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.9228163E+28.

let values = 
    [| Decimal.MinValue; -1034.23m; -12m; 0m; 147m; 199.55m; 9214.16m; Decimal.MaxValue |]

for value in values do
    let result = Convert.ToSingle value
    printfn $"Converted the {value.GetType().Name} value {value} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Decimal value '-79228162514264337593543950335' to the Single value -7.9228163E+28.
//    Converted the Decimal value '-1034.23' to the Single value -1034.23.
//    Converted the Decimal value '-12' to the Single value -12.
//    Converted the Decimal value '0' to the Single value 0.
//    Converted the Decimal value '147' to the Single value 147.
//    Converted the Decimal value '199.55' to the Single value 199.55.
//    Converted the Decimal value '9214.16' to the Single value 9214.16.
//    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.9228163E+28.

Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
                            199.55d, 9214.16d, Decimal.MaxValue }
Dim result As Single

For Each value As Decimal In values
   result = Convert.ToSingle(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 Decimal value '-79228162514264337593543950335' to the Single value -7.922816E+28.
'    Converted the Decimal value '-1034.23' to the Single value -1034.23.
'    Converted the Decimal value '-12' to the Single value -12.
'    Converted the Decimal value '0' to the Single value 0.
'    Converted the Decimal value '147' to the Single value 147.
'    Converted the Decimal value '199.55' to the Single value 199.55.
'    Converted the Decimal value '9214.16' to the Single value 9214.16.
'    Converted the Decimal value '79228162514264337593543950335' to the Single value 7.922816E+28.

こちらもご覧ください

Round

適用対象

ToSingle(DateTime)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

このメソッドを呼び出すと、必ず InvalidCastException がスローされます。

public:
 static float ToSingle(DateTime value);

public static float ToSingle (DateTime value);

static member ToSingle : DateTime -> single

Public Shared Function ToSingle (value As DateTime) As Single

パラメーター

value: DateTime

変換する日時の値。

戻り値

Single

この変換はサポートされていません。値は返されません。

例外

InvalidCastException

この変換はサポートされていません。

適用対象

ToSingle(Char)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

このメソッドを呼び出すと、必ず InvalidCastException がスローされます。

public:
 static float ToSingle(char value);

public static float ToSingle (char value);

static member ToSingle : char -> single

Public Shared Function ToSingle (value As Char) As Single

パラメーター

value: Char

変換する Unicode 文字。

戻り値

Single

この変換はサポートされていません。値は返されません。

例外

InvalidCastException

この変換はサポートされていません。

こちらもご覧ください

Char

適用対象

ToSingle(Byte)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した 8 ビット符号なし整数の値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(System::Byte value);

public static float ToSingle (byte value);

static member ToSingle : byte -> single

Public Shared Function ToSingle (value As Byte) As Single

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

Single

value と等価の単精度浮動小数点数。

例

次の例では、バイト値の配列内の各要素を Single 値に変換します。

byte[] numbers = { Byte.MinValue, 10, 100, Byte.MaxValue };
float result;

foreach (byte number in numbers)
{
   result = Convert.ToSingle(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 Byte value 0 to the Single value 0.
//       Converted the Byte value 10 to the Single value 10.
//       Converted the Byte value 100 to the Single value 100.
//       Converted the Byte value 255 to the Single value 255.

let numbers = [| Byte.MinValue; 10uy; 100uy; Byte.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//       Converted the Byte value 0 to the Single value 0.
//       Converted the Byte value 10 to the Single value 10.
//       Converted the Byte value 100 to the Single value 100.
//       Converted the Byte value 255 to the Single value 255.

Dim numbers() As Byte = { Byte.MinValue, 10, 100, Byte.MaxValue }
Dim result As Single

For Each number As Byte In numbers
   result = Convert.ToSingle(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 Byte value 0 to the Single value 0.
'       Converted the Byte value 10 to the Single value 10.
'       Converted the Byte value 100 to the Single value 100.
'       Converted the Byte value 255 to the Single value 255.

適用対象

ToSingle(Boolean)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定したブール値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(bool value);

public static float ToSingle (bool value);

static member ToSingle : bool -> single

Public Shared Function ToSingle (value As Boolean) As Single

パラメーター

value: Boolean

変換するブール値。

戻り値

Single

value が true の場合は数値の 1。それ以外の場合は 0。

例

次の例では、ブール値と false を値trueにSingle変換します。

bool[] flags = { true, false };
float result;

foreach (bool flag in flags)
{
   result = Convert.ToSingle(flag);
   Console.WriteLine("Converted {0} to {1}.", flag, result);
}
// The example displays the following output:
//       Converted True to 1.
//       Converted False to 0.

let flags = [| true; false |]

for flag in flags do
    let result = Convert.ToSingle flag
    printfn $"Converted {flag} to {result}."
// The example displays the following output:
//       Converted True to 1.
//       Converted False to 0.

Dim flags() As Boolean = { True, False }
Dim result As Single

For Each flag As Boolean In flags
   result = Convert.ToSingle(flag)
   Console.WriteLine("Converted {0} to {1}.", flag, result)
Next
' The example displays the following output:
'       Converted True to 1.
'       Converted False to 0.

適用対象

ToSingle(Int64)

ソース:: Convert.cs

ソース:: Convert.cs

ソース:: Convert.cs

指定した 64 ビット符号付き整数の値を等価の単精度浮動小数点数に変換します。

public:
 static float ToSingle(long value);

public static float ToSingle (long value);

static member ToSingle : int64 -> single

Public Shared Function ToSingle (value As Long) As Single

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

Single

value と等価の単精度浮動小数点数。

例

次の例では、長整数の配列内の各要素を値に Single 変換します。

long[] numbers = { Int64.MinValue, -903, 0, 172, Int64.MaxValue};
float result;

foreach (long number in numbers)
{
   result = Convert.ToSingle(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 Int64 value '-9223372036854775808' to the Single value -9.223372E+18.
//    Converted the Int64 value '-903' to the Single value -903.
//    Converted the Int64 value '0' to the Single value 0.
//    Converted the Int64 value '172' to the Single value 172.
//    Converted the Int64 value '9223372036854775807' to the Single value 9.223372E+18.

let numbers = 
    [| Int64.MinValue; -903; 0; 172; Int64.MaxValue |]

for number in numbers do
    let result = Convert.ToSingle number
    printfn $"Converted the {number.GetType().Name} value {number} to the {result.GetType().Name} value {result}."
// The example displays the following output:
//    Converted the Int64 value '-9223372036854775808' to the Single value -9.223372E+18.
//    Converted the Int64 value '-903' to the Single value -903.
//    Converted the Int64 value '0' to the Single value 0.
//    Converted the Int64 value '172' to the Single value 172.
//    Converted the Int64 value '9223372036854775807' to the Single value 9.223372E+18.

      Dim numbers() As Long = { Int64.MinValue, -903, 0, 172, Int64.MaxValue}
      Dim result As Single

      For Each number As Long In numbers
         result = Convert.ToSingle(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 Int64 value '-9223372036854775808' to the Single value -9.223372E+18.
Converted the Int64 value '-903' to the Single value -903.
Converted the Int64 value '0' to the Single value 0.
Converted the Int64 value '172' to the Single value 172.
Converted the Int64 value '9223372036854775807' to the Single value 9.223372E+18.

      '    Converted the Int64 value '-9223372036854775808' to the Single value -9.223372E+18.
      '    Converted the Int64 value '-903' to the Single value -903.
      '    Converted the Int64 value '0' to the Single value 0.
      '    Converted the Int64 value '172' to the Single value 172.
      '    Converted the Int64 value '9223372036854775807' to the Single value 9.223372E+18.

適用対象

次の方法で共有

Convert.ToSingle メソッド

定義

オーバーロード

ToSingle(String, IFormatProvider)

パラメーター

戻り値

例外

例

注釈

適用対象

ToSingle(SByte)

パラメーター

戻り値

例

適用対象

ToSingle(Object, IFormatProvider)

パラメーター

戻り値

例外

例

注釈

適用対象

ToSingle(UInt64)

パラメーター

戻り値

例

適用対象

ToSingle(UInt32)

パラメーター

戻り値

例

適用対象

ToSingle(String)

パラメーター

戻り値

例外

例

注釈

適用対象

ToSingle(Single)

パラメーター

戻り値

こちらもご覧ください

適用対象

ToSingle(Object)

パラメーター

戻り値

例外

例

注釈

適用対象

ToSingle(UInt16)

パラメーター

戻り値

例

適用対象

ToSingle(Int32)

パラメーター

戻り値

例

適用対象

ToSingle(Int16)

パラメーター

戻り値

例

適用対象

ToSingle(Double)

パラメーター

戻り値

例

こちらもご覧ください

適用対象

ToSingle(Decimal)

パラメーター

戻り値

例

こちらもご覧ください

適用対象

ToSingle(DateTime)