如何在 C# 8.0 中编写新的 Switch 表达式?
在表达式上下文中,switch 表达式提供了类似于 switch 的语义
switch 是一个选择语句,它根据与匹配表达式的模式匹配,从候选列表中选择单个 switch 部分来执行。
如果一个单独的表达式要针对三个或更多条件进行测试,则通常将 switch 语句用作 if-else 结构的替代方法。
示例
编写 Switch 的新方法
var message = c switch{ Fruits.Red => "The Fruits is red", Fruits.Green => "The Fruits is green", Fruits.Blue => "The Fruits is blue" };
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(); } }
输出
The Fruits is green The Fruits is green
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