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Decimal.Increment 运算符

2013/12/13

Decimal 操作数增加 1。

Namespace:  System
程序集:  mscorlib(位于 mscorlib.dll 中)

public static decimal operator ++(
	decimal d
)

参数

d
类型: System.Decimal
Decimal 操作数。

返回值

类型: System.Decimal
d 增加 1 后的值。

异常条件
OverflowException

返回值小于 MinValue 或大于 MaxValue

下面的代码示例对几个 Decimal 值应用 Increment 运算符。


// Example of the decimal increment, decrement, unary negation, and 
// unary plus operators.
using System;

class Example
{
   // Get the exception type name; remove the namespace prefix.
   public static string GetExceptionType(Exception ex)
   {
      string exceptionType = ex.GetType().ToString();
      return exceptionType.Substring(
          exceptionType.LastIndexOf('.') + 1);
   }

   // Display the argument and the incremented and decremented values.
   public static void DecIncrDecrUnary(System.Windows.Controls.TextBlock outputBlock, decimal argument)
   {
      decimal toBeIncr = argument;
      decimal toBeDecr = argument;

      outputBlock.Text += String.Format("{0,-26}{1}", "decimal argument: ",
          argument) + "\n";

      // Catch the exception if the increment operator throws one.
      outputBlock.Text += String.Format("{0,-26}", "argument ++");
      try
      {
         toBeIncr++;
         outputBlock.Text += String.Format("{0}", toBeIncr) + "\n";
      }
      catch (Exception ex)
      {
         outputBlock.Text += String.Format("{0}", GetExceptionType(ex)) + "\n";
      }

      // Catch the exception if the decrement operator throws one.
      outputBlock.Text += String.Format("{0,-26}", "argument --");
      try
      {
         toBeDecr--;
         outputBlock.Text += String.Format("{0}", toBeDecr) + "\n";
      }
      catch (Exception ex)
      {
         outputBlock.Text += String.Format("{0}", GetExceptionType(ex)) + "\n";
      }

      outputBlock.Text += "\n";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.Text += String.Format("This example of the decimal increment, " +
          "decrement, unary negation, \nand unary plus operators " +
          "generates the following output. It \ndisplays the " +
          "results of the operators on several decimal values.\n") + "\n";

      // Create objects to compare with the reference.
      DecIncrDecrUnary(outputBlock, 0.000000123M);
      DecIncrDecrUnary(outputBlock, new decimal(123000000, 0, 0, false, 9));
      DecIncrDecrUnary(outputBlock, -new decimal(123000000, 0, 0, false, 9));
      DecIncrDecrUnary(outputBlock, +decimal.MaxValue);
      DecIncrDecrUnary(outputBlock, -decimal.MaxValue);
      DecIncrDecrUnary(outputBlock, +7.5000000000000000000000000001M);
   }
}

/*
This example of the decimal increment, decrement, unary negation,
and unary plus operators generates the following output. It
displays the results of the operators on several decimal values.

decimal argument:         0.000000123
argument ++               1.000000123
argument --               -0.999999877

decimal argument:         0.123000000
argument ++               1.123000000
argument --               -0.877000000

decimal argument:         -0.123000000
argument ++               0.877000000
argument --               -1.123000000

decimal argument:         79228162514264337593543950335
argument ++               OverflowException
argument --               79228162514264337593543950334

decimal argument:         -79228162514264337593543950335
argument ++               -79228162514264337593543950334
argument --               OverflowException

decimal argument:         7.5000000000000000000000000001
argument ++               8.500000000000000000000000000
argument --               6.5000000000000000000000000001
*/


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受以下版本支持: 8.0, 7.1, 7.0

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