switch表达式在表达式上下文中提供了类似switch的语义。
switch是一个选择语句，根据与匹配表达式的模式匹配，从候选列表中选择一个单独的switch部分来执行。
如果一个单独的表达式需要与三个或更多条件进行测试，通常使用switch语句作为if-else结构的替代方案。
示例
新的switch写法
var message = c switch{
Fruits.Red => "The Fruits is red",
Fruits.Green => "The Fruits is green",
Fruits.Blue => "The Fruits is blue"
};
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示例 1
class Program{
public enum Fruits { Red, Green, Blue }
public static void Main(){
Fruits c = (Fruits)(new Random()).Next(0, 3);
switch (c){
case Fruits.Red:
Console.WriteLine("The Fruits is red");
break;
case Fruits.Green:
Console.WriteLine("The Fruits is green");
break;
case Fruits.Blue:
Console.WriteLine("The Fruits is blue");
break;
default:
Console.WriteLine("The Fruits is unknown.");
break;
}
var message = c switch{
Fruits.Red => "The Fruits is red",
Fruits.Green => "The Fruits is green",
Fruits.Blue => "The Fruits is blue"
};
System.Console.WriteLine(message);
Console.ReadLine();
}
}
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输出
The Fruits is green
The Fruits is green
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