在 .net 8中，switch 不需要再和传统的写法一样了，会更加的方便

创建一个 .net 8 控制台项目

switch 的写法没必要和以前一样

namespace SwitchTest
{internal class Program{static void Main(string[] args){int day = 3;var week = day switch{1 => "Monday",2 => "Tuesday",3 => "Wednesday",4 => "Thursday",5 => "Friday",_ => "oh shit"} ;Console.WriteLine(week);}}
}

运行：

如果将 day 设置为 30，在所有的选择中都找不到，那么结果就自动执行 _ 选项代码

namespace SwitchTest
{internal class Program{static void Main(string[] args){int day = 30;var week = day switch{1 => "Monday",2 => "Tuesday",3 => "Wednesday",4 => "Thursday",5 => "Friday",_ => "oh shit"} ;Console.WriteLine(week);}}
}

运行：

遍历枚举写法一样

namespace SwitchTest
{internal class Program{enum color { red, yellow, green }static void Main(string[] args){color myColos = color.red;string colosStr = myColos switch{color.red => "红",color.yellow => "黄",color.green => "绿",_ => throw new Exception()} ;Console.WriteLine(colosStr);}}
}

end