Decimal.ToInt32(Decimal) 方法

定义

命名空间:

System

程序集:

System.Runtime.dll

程序集:

mscorlib.dll

程序集:

netstandard.dll

将指定的 Decimal 值转换为等效的 32 位有符号整数。

public:
 static int ToInt32(System::Decimal d);

public static int ToInt32 (decimal d);

static member ToInt32 : decimal -> int

Public Shared Function ToInt32 (d As Decimal) As Integer

参数

d

Decimal

要转换的十进制数。

返回

Int32

与 d 的值等效的 32 位有符号整数。

例外

OverflowException

d 小于 Int32.MinValue 或大于 Int32.MaxValue。

示例

以下示例使用该方法 ToInt32 将十进制数转换为 Int32 值。

using System;

class Example
{
   public static void Main( )
   {
      decimal[] values = { 123m, new decimal(123000, 0, 0, false, 3),
                           123.999m, 4294967295.999m, 4294967296m,
                           4294967296m, 2147483647.999m, 2147483648m,
                           -0.999m, -1m, -2147483648.999m, -2147483649m };

      foreach (var value in values) {
         try {
            int number = Decimal.ToInt32(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
//      OverflowException: 4294967295.999
//      OverflowException: 4294967296
//      OverflowException: 4294967296
//      2147483647.999 --> 2147483647
//      OverflowException: 2147483648
//      -0.999 --> 0
//      -1 --> -1
//      -2147483648.999 --> -2147483648
//      OverflowException: -2147483649

open System

let values = 
    [ 123m; Decimal(123000, 0, 0, false, 3uy)
      123.999m; 4294967295.999m; 4294967296m
      4294967296m; 2147483647.999m; 2147483648m
      -0.999m; -1m; -2147483648.999m; -2147483649m ]

for value in values do
    try
        let number = Decimal.ToInt32 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
//      OverflowException: 4294967295.999
//      OverflowException: 4294967296
//      OverflowException: 4294967296
//      2147483647.999 --> 2147483647
//      OverflowException: 2147483648
//      -0.999 --> 0
//      -1 --> -1
//      -2147483648.999 --> -2147483648
//      OverflowException: -2147483649

Module Example
   Public Sub Main()
      Dim values() As Decimal = { 123d, New Decimal(123000, 0, 0, false, 3), 
                                  123.999d, 4294967295.999d, 4294967296d,
                                  4294967296d, 2147483647.999d, 2147483648d, 
                                  -0.999d, -1d, -2147483648.999d, -2147483649d }

      For Each value In values
         Try
            Dim number As Integer = Decimal.ToInt32(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
'       OverflowException: 4294967295.999
'       OverflowException: 4294967296
'       OverflowException: 4294967296
'       2147483647.999 --> 2147483647
'       OverflowException: 2147483648
'       -0.999 --> 0
'       -1 --> -1
'       -2147483648.999 --> -2147483648
'       OverflowException: -2147483649
'

注解

返回值是小数值的整型部分;小数位数被截断。

还可以使用Explicit赋值运算符将值转换为 Decimal 32 位整数。 由于运算符执行缩小转换，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

• Int32