Decimal.Decrement(Decimal) 操作员

定义

Decimal 操作数减 1。

public:
 static System::Decimal operator --(System::Decimal d);
public:
 static System::Decimal operator --(System::Decimal d) = System::Numerics::IDecrementOperators<System::Decimal>::op_Decrement;
public static decimal operator -- (decimal d);
static member op_Decrement : decimal -> decimal
Public Shared op_Decrement (d As Decimal) As Decimal

参数

d
Decimal

要递减的值。

返回

d 减 1 所得的值。

实现

例外

返回值小于 Decimal.MinValue 或大于 Decimal.MaxValue

注解

方法 Decrement 定义值递减运算符的操作 Decimal 。 它启用如下代码:

using System;

public class Example
{
   public static void Main()
   {
      Decimal number = 1079.8m;
      Console.WriteLine("Original value:    {0:N}", number);
      Console.WriteLine("Decremented value: {0:N}", --number);
   }
}
// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80
let number = 1079.8m
printfn $"Original value:    {number:N}"
printfn $"Decremented value: {- -number:N}"

// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80

某些语言 ((如 Visual Basic) )缺少增量运算符,可以直接调用 Decrement 方法,如以下示例所示。

Module Example
   Public Sub Main()
      Dim number As Decimal = 1079.8d
      Console.WriteLine("Original value:    {0:N}", number)
      Console.WriteLine("Decremented value: {0:N}", Decimal.op_Decrement(number))
   End Sub
End Module
' The example displays the following output:
'       Original value:    1,079.80
'       Decremented value: 1,078.80

如果语言不支持自定义运算符,请改为调用 Subtract 方法,如以下示例所示。

using System;

public class Example
{
   public static void Main()
   {
      Decimal number = 1079.8m;
      Console.WriteLine("Original value:    {0:N}", number);
      Console.WriteLine("Decremented value: {0:N}", Decimal.Subtract(number, 1));
   }
}
// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80
open System

let number = 1079.8m
printfn $"Original value:    {number:N}"
printfn $"Decremented value: {Decimal.Subtract(number, 1):N}"

// The example displays the following output:
//       Original value:    1,079.80
//       Decremented value: 1,078.80
Module Example
   Public Sub Main()
      Dim number As Decimal = 1079.8d
      Console.WriteLine("Original value:    {0:N}", number)
      Console.WriteLine("Decremented value: {0:N}", Decimal.Subtract(number, 1))
   End Sub
End Module
' The example displays the following output:
'       Original value:    1,079.80
'       Decremented value: 1,078.80

适用于

另请参阅