C# 如何在 switch 语句中添加“或”？
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How add "or" in switch statements?
提问by Ivan Prodanov
This is what I want to do:
这就是我想要做的：
switch(myvar)
{
case: 2 or 5:
...
break;
case: 7 or 12:
...
break;
...
}
I tried with "case: 2 || 5" ,but it didn't work.
我试过 "case: 2 || 5" ，但没有用。
The purpose is to not write same code for different values.
目的是不要为不同的值编写相同的代码。
采纳答案by Jose Basilio
By stacking each switch case, you achieve the OR condition.
通过堆叠每个开关案例，您可以实现 OR 条件。
switch(myvar)
{
case 2:
case 5:
...
break;
case 7:
case 12:
...
break;
...
}
回答by On Freund
case 2:
case 5:
do something
break;
回答by Dave Webb
You do it by stacking case labels:
您可以通过堆叠案例标签来实现：
switch(myvar)
{
case 2:
case 5:
...
break;
case 7:
case 12:
...
break;
...
}
回答by AnnaR
Case-statements automatically fall through if you don't specify otherwise (by writing break). Therefor you can write
如果您没有另外指定（通过写中断），案例陈述会自动失败。因此你可以写
switch(myvar)
{
case 2:
case 5:
{
//your code
break;
}
// etc... }
// 等等... }
回答by gimel
The example for switch statementshows that you can't stack non-empty cases, but should use gotos:
switch 语句的示例表明您不能堆叠非空cases，但应该使用gotos：
// statements_switch.cs
using System;
class SwitchTest
{
public static void Main()
{
Console.WriteLine("Coffee sizes: 1=Small 2=Medium 3=Large");
Console.Write("Please enter your selection: ");
string s = Console.ReadLine();
int n = int.Parse(s);
int cost = 0;
switch(n)
{
case 1:
cost += 25;
break;
case 2:
cost += 25;
goto case 1;
case 3:
cost += 50;
goto case 1;
default:
Console.WriteLine("Invalid selection. Please select 1, 2, or3.");
break;
}
if (cost != 0)
Console.WriteLine("Please insert {0} cents.", cost);
Console.WriteLine("Thank you for your business.");
}
}
