System.Int64 結構

發行項
01/08/2024

本文提供此 API 參考文件的補充備註。

Int64 是不可變的實值型別，代表帶正負數 9,223,372,036,854,775,808（以常數表示 Int64.MinValue ）到正數 9,223,372,036,854,775,807（以常數表示 Int64.MaxValue ）。 .NET 也包含不帶正負號的 64 位整數實值類型， UInt64代表介於 0 到 18,446,744,073,709,551,615 的值。

具現化 Int64 值

您可以透過數種方式具現化 Int64 值：

您可以宣告 Int64 變數，併為其指派數據類型範圍內的 Int64 常值整數值。下列範例會宣告兩個 Int64 變數，並以這種方式指派這些變數。

long number1 = -64301728;
long number2 = 255486129307;

let number1 = -64301728L
let number2 = 255486129307L

Dim number1 As Long = -64301728
Dim number2 As Long = 255486129307

您可以指派整數型別的值，其範圍是型別 Int64 的子集。這是擴大轉換，不需要 C# 中的轉換運算元或 Visual Basic 中的轉換方法。在 F# 中 Int32 ，只能自動擴大類型。

sbyte value1 = 124;
short value2 = 1618;
int value3 = Int32.MaxValue;

long number1 = value1;
long number2 = value2;
long number3 = value3;

let value1 = 124y
let value2 = 1618s
let value3 = Int32.MaxValue

let number1 = int64 value1
let number2 = int64 value2
let number3: int64 = value3

Dim value1 As SByte = 124
Dim value2 As Int16 = 1618
Dim value3 As Int32 = Int32.MaxValue

Dim number1 As Long = value1
Dim number2 As Long = value2
Dim number3 As Long = value3

您可以指派數值型別的值，其範圍超過該型別的值 Int64 。這是縮小轉換，因此如果開啟，則需要 C# 或 F# 中的轉換運算元和 Visual Basic Option Strict 中的轉換方法。如果數值是包含 Single小數位元件的、 Double或 Decimal 值，則其小數部分的處理取決於執行轉換的編譯程式。下列範例會執行縮小轉換，將數個數值指派給 Int64 變數。

ulong ulNumber = 163245617943825;
try {
   long number1 = (long) ulNumber;
   Console.WriteLine(number1);
}
catch (OverflowException) {
   Console.WriteLine("{0} is out of range of an Int64.", ulNumber);
}

double dbl2 = 35901.997;
try {
   long number2 = (long) dbl2;
   Console.WriteLine(number2);
}
catch (OverflowException) {
   Console.WriteLine("{0} is out of range of an Int64.", dbl2);
}

BigInteger bigNumber = (BigInteger) 1.63201978555e30;
try {
   long number3 = (long) bigNumber;
   Console.WriteLine(number3);
}
catch (OverflowException) {
   Console.WriteLine("{0} is out of range of an Int64.", bigNumber);
}
// The example displays the following output:
//    163245617943825
//    35902
//    1,632,019,785,549,999,969,612,091,883,520 is out of range of an Int64.

let ulNumber = 163245617943825uL
try
    let number1 = int64 ulNumber
    printfn $"{number1}"
with :? OverflowException ->
    printfn $"{ulNumber} is out of range of an Int64."

let dbl2 = 35901.997
try
    let number2 = int64 dbl2
    printfn $"{number2}"
with :? OverflowException ->
    printfn $"{dbl2} is out of range of an Int64."

let bigNumber = BigInteger 1.63201978555e30
try
    let number3 = int64 bigNumber
    printfn $"{number3}"
with :? OverflowException ->
    printfn $"{bigNumber} is out of range of an Int64."

// The example displays the following output:
//    163245617943825
//    35902
//    1,632,019,785,549,999,969,612,091,883,520 is out of range of an Int64.

Dim ulNumber As ULong = 163245617943825
Try
   Dim number1 As Long = CLng(ulNumber)
   Console.WriteLine(number1)
Catch e As OverflowException
   Console.WriteLine("{0} is out of range of an Int64.", ulNumber)
End Try

Dim dbl2 As Double = 35901.997
Try
   Dim number2 As Long = CLng(dbl2)
   Console.WriteLine(number2)
Catch e As OverflowException
   Console.WriteLine("{0} is out of range of an Int64.", dbl2)
End Try
   
Dim bigNumber As BigInteger = 1.63201978555e30
Try
   Dim number3 As Long = CLng(bigNumber)
   Console.WriteLine(number3)
Catch e As OverflowException
   Console.WriteLine("{0:N0} is out of range of an Int64.", bigNumber)
End Try    
' The example displays the following output:
'    163245617943825
'    35902
'    1,632,019,785,549,999,969,612,091,883,520 is out of range of an Int64.

您可以呼叫類別的 Convert 方法，將任何支援的型 Int64 別轉換為值。這是可能的，因為 Int64 支援 IConvertible 介面。下列範例說明如何將值Int64陣列Decimal轉換成值。

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

foreach (decimal value in values)
{
   try {
      result = Convert.ToInt64(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Int64 type.",
                        value);
   }
}
// The example displays the following output:
//    -79228162514264337593543950335 is outside the range of the Int64 type.
//    Converted the Decimal value '-1034.23' to the Int64 value -1034.
//    Converted the Decimal value '-12' to the Int64 value -12.
//    Converted the Decimal value '0' to the Int64 value 0.
//    Converted the Decimal value '147' to the Int64 value 147.
//    Converted the Decimal value '199.55' to the Int64 value 200.
//    Converted the Decimal value '9214.16' to the Int64 value 9214.
//    79228162514264337593543950335 is outside the range of the Int64 type.

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

for value in values do
    try
        let result = Convert.ToInt64 value
        printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}." 
    with :? OverflowException ->
        printfn $"{value} is outside the range of the Int64 type."
    
// The example displays the following output:
//    -79228162514264337593543950335 is outside the range of the Int64 type.
//    Converted the Decimal value '-1034.23' to the Int64 value -1034.
//    Converted the Decimal value '-12' to the Int64 value -12.
//    Converted the Decimal value '0' to the Int64 value 0.
//    Converted the Decimal value '147' to the Int64 value 147.
//    Converted the Decimal value '199.55' to the Int64 value 200.
//    Converted the Decimal value '9214.16' to the Int64 value 9214.
//    79228162514264337593543950335 is outside the range of the Int64 type.

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

For Each value As Decimal In values
    Try
        result = Convert.ToInt64(value)
        Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                      value.GetType().Name, value,
                      result.GetType().Name, result)
    Catch e As OverflowException
        Console.WriteLine("{0} is outside the range of the Int64 type.",
                      value)
    End Try
Next
' The example displays the following output:
'    -79228162514264337593543950335 is outside the range of the Int64 type.
'    Converted the Decimal value '-1034.23' to the Int64 value -1034.
'    Converted the Decimal value '-12' to the Int64 value -12.
'    Converted the Decimal value '0' to the Int64 value 0.
'    Converted the Decimal value '147' to the Int64 value 147.
'    Converted the Decimal value '199.55' to the Int64 value 200.
'    Converted the Decimal value '9214.16' to the Int64 value 9214.
'    79228162514264337593543950335 is outside the range of the Int64 type.

您可以呼叫 Parse 或 TryParse 方法，將值的字串表示 Int64 轉換成 Int64。字串可以包含十進位或十六進位數位。下列範例說明使用十進位和十六進位字串來剖析作業。

string string1 = "244681903147";
try {
   long number1 = Int64.Parse(string1);
   Console.WriteLine(number1);
}
catch (OverflowException) {
   Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string1);
}
catch (FormatException) {
   Console.WriteLine("The format of '{0}' is invalid.", string1);
}

string string2 = "F9A3CFF0A";
try {
   long number2 = Int64.Parse(string2,
                              System.Globalization.NumberStyles.HexNumber);
   Console.WriteLine(number2);
}
catch (OverflowException) {
   Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string2);
}
catch (FormatException) {
   Console.WriteLine("The format of '{0}' is invalid.", string2);
}
// The example displays the following output:
//    244681903147
//    67012198154

let string1 = "244681903147"
try
    let number1 = Int64.Parse string1
    printfn $"{number1}"
with
| :? OverflowException ->
    printfn $"'{string1}' is out of range of a 64-bit integer."
| :? FormatException ->
    printfn $"The format of '{string1}' is invalid."

let string2 = "F9A3CFF0A"
try
    let number2 = Int64.Parse(string2, NumberStyles.HexNumber)
    printfn $"{number2}"

with
| :? OverflowException ->
    printfn $"'{string2}' is out of range of a 64-bit integer."
| :? FormatException ->
    printfn $"The format of '{string2}' is invalid."

// The example displays the following output:
//    244681903147
//    67012198154

Dim string1 As String = "244681903147"
Try
   Dim number1 As Long = Int64.Parse(string1)
   Console.WriteLine(number1)
Catch e As OverflowException
   Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string1)
Catch e As FormatException
   Console.WriteLine("The format of '{0}' is invalid.", string1)
End Try

Dim string2 As String = "F9A3CFF0A"
Try
   Dim number2 As Long = Int64.Parse(string2,
                            System.Globalization.NumberStyles.HexNumber)
   Console.WriteLine(number2)
Catch e As OverflowException
   Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string2)
Catch e As FormatException
   Console.WriteLine("The format of '{0}' is invalid.", string2)
End Try
' The example displays the following output:
'    244681903147
'    67012198154

對 Int64 值執行作業

此 Int64 類型支援標準數學運算，例如加法、減法、除法、乘法、否定和一元否定。如同其他整數型別，此 Int64 類型也支援位 AND、、 OR、 XOR左移和右移運算符。

您可以使用標準數值運算符來比較兩個 Int64 值，也可以呼叫 CompareTo 或 Equals 方法。

您也可以呼叫類別的成員 Math 來執行廣泛的數值運算，包括取得數位的絕對值、計算整數除數的商數和餘數、判斷兩個長整數的最大值或最小值、取得數位的正負號，以及四捨五入數位。

以字串表示 Int64

此 Int64 類型提供標準和自定義數值格式字串的完整支援。（如需詳細資訊，請參閱格式化類型、標準數值格式字串和自定義數值格式字串。）

若要將 Int64 值格式化為不含前置零的整數位符串，您可以呼叫無 ToString() 參數方法。藉由使用「D」格式規範，您也可以在字串表示中包含指定數目的前置零。藉由使用「N」格式規範，您可以包含群組分隔符，並指定要出現在數位字串表示中的十進位數。藉由使用「X」格式規範，您可以將值表示 Int64 為十六進位字串。下列範例會以這四種方式格式化值陣列 Int64 中的元素。

long[] numbers = { -1403, 0, 169, 1483104 };
foreach (var number in numbers)
{
    // Display value using default formatting.
    Console.Write("{0,-8}  -->   ", number.ToString());
    // Display value with 3 digits and leading zeros.
    Console.Write("{0,8:D3}", number);
    // Display value with 1 decimal digit.
    Console.Write("{0,13:N1}", number);
    // Display value as hexadecimal.
    Console.Write("{0,18:X2}", number);
    // Display value with eight hexadecimal digits.
    Console.WriteLine("{0,18:X8}", number);
}
// The example displays the following output:
//    -1403     -->      -1403     -1,403.0  FFFFFFFFFFFFFA85  FFFFFFFFFFFFFA85
//    0         -->        000          0.0                00          00000000
//    169       -->        169        169.0                A9          000000A9
//    1483104   -->    1483104  1,483,104.0            16A160          0016A160

let numbers = [| -1403L; 0L; 169L; 1483104L |]
for number in numbers do
    // Display value using default formatting.
    printf $"{number.ToString(),-8}  -->   "
    // Display value with 3 digits and leading zeros.
    printf $"{number,8:D3}"
    // Display value with 1 decimal digit.
    printf $"{number,13:N1}"
    // Display value as hexadecimal.
    printf $"{number,18:X2}"
    // Display value with eight hexadecimal digits.
    printfn $"{number,18:X8}"

// The example displays the following output:
//    -1403     -->      -1403     -1,403.0  FFFFFFFFFFFFFA85  FFFFFFFFFFFFFA85
//    0         -->        000          0.0                00          00000000
//    169       -->        169        169.0                A9          000000A9
//    1483104   -->    1483104  1,483,104.0            16A160          0016A160

Dim numbers() As Long = { -1403, 0, 169, 1483104 }
For Each number In numbers
   ' Display value using default formatting.
   Console.Write("{0,-8}  -->   ", number.ToString())
   ' Display value with 3 digits and leading zeros.
   Console.Write("{0,8:D3}", number)
   ' Display value with 1 decimal digit.
   Console.Write("{0,13:N1}", number) 
   ' Display value as hexadecimal.
   Console.Write("{0,18:X2}", number)
   ' Display value with eight hexadecimal digits.
   Console.WriteLine("{0,18:X8}", number)
Next   
' The example displays the following output:
'    -1403     -->      -1403     -1,403.0  FFFFFFFFFFFFFA85  FFFFFFFFFFFFFA85
'    0         -->        000          0.0                00          00000000
'    169       -->        169        169.0                A9          000000A9
'    1483104   -->    1483104  1,483,104.0            16A160          0016A160

您也可以呼叫 ToString(Int64, Int32) 方法，並提供基底做為方法的第二個參數，將值格式化Int64為二進位、八進位、十六進位或十六進位字串。下列範例會呼叫這個方法，以顯示整數值陣列的二進位、八進位和十六進位表示法。

long[] numbers = { -146, 11043, 2781913 };
foreach (var number in numbers)
{
    Console.WriteLine("{0} (Base 10):", number);
    Console.WriteLine("   Binary:  {0}", Convert.ToString(number, 2));
    Console.WriteLine("   Octal:   {0}", Convert.ToString(number, 8));
    Console.WriteLine("   Hex:     {0}\n", Convert.ToString(number, 16));
}
// The example displays the following output:
//    -146 (Base 10):
//       Binary:  1111111111111111111111111111111111111111111111111111111101101110
//       Octal:   1777777777777777777556
//       Hex:     ffffffffffffff6e
//
//    11043 (Base 10):
//       Binary:  10101100100011
//       Octal:   25443
//       Hex:     2b23
//
//    2781913 (Base 10):
//       Binary:  1010100111001011011001
//       Octal:   12471331
//       Hex:     2a72d9

let numbers = [| -146L; 11043L; 2781913L |]
for number in numbers do
    printfn $"{number} (Base 10):"
    printfn $"   Binary:  {Convert.ToString(number, 2)}"
    printfn $"   Octal:   {Convert.ToString(number, 8)}"
    printfn $"   Hex:     {Convert.ToString(number, 16)}\n"

// The example displays the following output:
//    -146 (Base 10):
//       Binary:  1111111111111111111111111111111111111111111111111111111101101110
//       Octal:   1777777777777777777556
//       Hex:     ffffffffffffff6e
//
//    11043 (Base 10):
//       Binary:  10101100100011
//       Octal:   25443
//       Hex:     2b23
//
//    2781913 (Base 10):
//       Binary:  1010100111001011011001
//       Octal:   12471331
//       Hex:     2a72d9

Dim numbers() As Long = { -146, 11043, 2781913 }
For Each number In numbers
   Console.WriteLine("{0} (Base 10):", number)
   Console.WriteLine("   Binary:  {0}", Convert.ToString(number, 2))
   Console.WriteLine("   Octal:   {0}", Convert.ToString(number, 8))
   Console.WriteLine("   Hex:     {0}", Convert.ToString(number, 16))
   Console.WriteLine()
Next      
' The example displays the following output:
'    -146 (Base 10):
'       Binary:  1111111111111111111111111111111111111111111111111111111101101110
'       Octal:   1777777777777777777556
'       Hex:     ffffffffffffff6e
'
'    11043 (Base 10):
'       Binary:  10101100100011
'       Octal:   25443
'       Hex:     2b23
'
'    2781913 (Base 10):
'       Binary:  1010100111001011011001
'       Octal:   12471331
'       Hex:     2a72d9

使用非十進位32位整數值

除了使用個別長整數做為十進位值之外，您可能還想要使用長整數值執行位運算，或使用長整數值的二進位或十六進位表示法。 Int64 值是以 63 位表示，而使用 64 位做為符號位的 64 位。正值是使用正負號表示法來表示。負值在兩者的補碼表示法中。當您對 Int64 值執行位運算或處理個別位時，請務必記住這點。若要在任何兩個非十進位值上執行數值、布爾值或比較運算，這兩個值都必須使用相同的表示法。

共用方式為

System.Int64 結構

具現化 Int64 值

對 Int64 值執行作業

以字串表示 Int64

使用非十進位32位整數值

其他資源