在 C# 中计算 Switch 语句中的表达式 [英] Evaluate Expressions in Switch Statements in C#

问题描述

我必须在 switch 语句中实现以下内容:

I have to implement the following in a switch statement:

switch(num)
{
  case 4:
    // some code ;
    break;
  case 3:
    // some code ;
    break;
  case 0:
    // some code ;
    break;
  case < 0:
    // some code ;
    break;
}

是否有可能让 switch 语句计算 case <0?如果没有，我该怎么做?

Is it possible to have the switch statement evaluate case < 0? If not, how could I do that?

推荐答案

注意:下面的答案写于 2009 年.开关模式是在 C# 7 中引入的.

Note: the answer below was written in 2009. Switch patterns were introduced in C# 7.

您不能 - switch/case 仅适用于单个值.如果要指定条件，则需要一个if":

You can't - switch/case is only for individual values. If you want to specify conditions, you need an "if":

if (num < 0)
{
    ...
}
else
{
    switch(num)
    {
        case 0: // Code
        case 1: // Code
        case 2: // Code
        ...
    }
}

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