switch表達式在表達式上下文中提供了類似switch的語意。
switch是一個選擇語句，根據與匹配表達式的模式匹配，從候選清單中選擇一個單獨的switch部分來執行。
如果一個單獨的表達式需要與三個或更多條件進行測試，通常會使用switch語句作為if-else結構的替代方案。
新的switch寫法
var message = c switch{
Fruits.Red => "The Fruits is red",
Fruits.Green => "The Fruits is green",
Fruits.Blue => "The Fruits is blue"
};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();
}
}The Fruits is green The Fruits is green
以上是如何在 C# 8.0 中寫出新的 Switch 表達式？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
