Decimal.ToUInt64(Decimal) 方法

定义

命名空间:

System

程序集:

System.Runtime.dll

Source:

Decimal.cs

重要

此 API 不符合 CLS。

将指定的 Decimal 的值转换为等效的 64 位无符号整数。

public:
 static System::UInt64 ToUInt64(System::Decimal d);

[System.CLSCompliant(false)]
public static ulong ToUInt64 (decimal d);

[<System.CLSCompliant(false)>]
static member ToUInt64 : decimal -> uint64

Public Shared Function ToUInt64 (d As Decimal) As ULong

参数

d

Decimal

要转换的十进制数。

返回

UInt64

与 d 的值等效的 64 位无符号整数。

属性

CLSCompliantAttribute

例外

OverflowException

d 为负或大于 UInt64.MaxValue。

示例

以下示例使用 ToUInt64 方法将十进制数转换为 UInt64 值。

using System;

class Example
{
   public static void Main( )
   {
      decimal[] values = { 123m, new Decimal(123000, 0, 0, false, 3),
                           123.999m, 18446744073709551615.999m,
                           18446744073709551616m, 9223372036854775807.999m,
                           9223372036854775808m, -0.999m, -1m,
                           -9223372036854775808.999m,
                           -9223372036854775809m };

      foreach (var value in values) {
         try {
            ulong number = Decimal.ToUInt64(value);
            Console.WriteLine("{0} --> {1}", value, number);
         }
         catch (OverflowException e)
         {
             Console.WriteLine("{0}: {1}", e.GetType().Name, value);
         }
      }
   }
}
// The example displays the following output:
//     123 --> 123
//     123.000 --> 123
//     123.999 --> 123
//     18446744073709551615.999 --> 18446744073709551615
//     OverflowException: 18446744073709551616
//     9223372036854775807.999 --> 9223372036854775807
//     9223372036854775808 --> 9223372036854775808
//     -0.999 --> 0
//     OverflowException: -1
//     OverflowException: -9223372036854775808.999
//     OverflowException: -9223372036854775809

open System

let values = 
    [ 123m; Decimal(123000, 0, 0, false, 3uy)
      123.999m; 18446744073709551615.999m
      18446744073709551616m; 9223372036854775807.999m
      9223372036854775808m; -0.999m; -1m
      -9223372036854775808.999m
      -9223372036854775809m ]

for value in values do
    try
        let number = Decimal.ToUInt64 value
        printfn $"{value} --> {number}"
    with :? OverflowException as e ->
        printfn $"{e.GetType().Name}: {value}"

// The example displays the following output:
//     123 --> 123
//     123.000 --> 123
//     123.999 --> 123
//     18446744073709551615.999 --> 18446744073709551615
//     OverflowException: 18446744073709551616
//     9223372036854775807.999 --> 9223372036854775807
//     9223372036854775808 --> 9223372036854775808
//     -0.999 --> 0
//     OverflowException: -1
//     OverflowException: -9223372036854775808.999
//     OverflowException: -9223372036854775809

Module Example
   Public Sub Main()
      Dim values() As Decimal = { 123d, New Decimal(123000, 0, 0, false, 3), 
                                  123.999d, 18446744073709551615.999d, 
                                  18446744073709551616d, 9223372036854775807.999d, 
                                  9223372036854775808d, -0.999d, -1d, 
                                  -9223372036854775808.999d, 
                                  -9223372036854775809d }

      For Each value In values
         Try
            Dim number As ULong = Decimal.ToUInt64(value)
            Console.WriteLine("{0} --> {1}", value, number)       
         Catch e As OverflowException
             Console.WriteLine("{0}: {1}", e.GetType().Name, value)
         End Try   
      Next
   End Sub
End Module
' The example displays the following output:
'     123 --> 123
'     123.000 --> 123
'     123.999 --> 123
'     18446744073709551615.999 --> 18446744073709551615
'     OverflowException: 18446744073709551616
'     9223372036854775807.999 --> 9223372036854775807
'     9223372036854775808 --> 9223372036854775808
'     -0.999 --> 0
'     OverflowException: -1
'     OverflowException: -9223372036854775808.999
'     OverflowException: -9223372036854775809

注解

返回值是十进制值的整型部分;小数位数将被截断。

还可以使用Explicit赋值运算符将值转换为 Decimal 64 位无符号整数。 由于 运算符执行收缩转换，因此必须使用 C# 中的强制转换运算符或 Visual Basic 中的转换函数。

另请参阅

• UInt64