c# switch支持哪些类型

C# 中的 switch 语句支持以下几种类型：

1. 字符串（string）：这是最常用的 switch 类型，可以对字符串进行比较。

string input = "apple"; switch (input) { case "apple": Console.WriteLine("It's an apple."); break; case "banana": Console.WriteLine("It's a banana."); break; default: Console.WriteLine("Unknown fruit."); break; } 

2. 整数（int、short、byte、sbyte）：可以对整数进行比较，支持范围检查。

int number = 2; switch (number) { case 1: Console.WriteLine("Number is one."); break; case 2: Console.WriteLine("Number is two."); break; case 3: Console.WriteLine("Number is three."); break; default: Console.WriteLine("Number is not 1, 2, or 3."); break; } 

3. 枚举（enum）：可以对枚举值进行比较。

enum Color { Red, Green, Blue } Color color = Color.Red; switch (color) { case Color.Red: Console.WriteLine("Color is red."); break; case Color.Green: Console.WriteLine("Color is green."); break; case Color.Blue: Console.WriteLine("Color is blue."); break; default: Console.WriteLine("Unknown color."); break; } 

4. 布尔值（bool）：可以对布尔值进行比较。

bool isRaining = true; switch (isRaining) { case true: Console.WriteLine("It's raining."); break; case false: Console.WriteLine("It's not raining."); break; default: Console.WriteLine("Unknown weather."); break; } 

5. 字节（byte）、短整型（short）、长整型（long）：这些数值类型也可以用于 switch 语句。

byte value = 1; switch (value) { case 1: Console.WriteLine("Value is one."); break; case 2: Console.WriteLine("Value is two."); break; default: Console.WriteLine("Value is not 1 or 2."); break; } 

6. 自定义类型：通过实现 IEquatable<T> 接口和重写 Equals() 方法，自定义类型也可以用于 switch 语句。

public class Person { public string Name { get; set; } public override bool Equals(object obj) { if (obj == null || GetType() != obj.GetType()) return false; Person person = (Person)obj; return string.Equals(Name, person.Name); } public override int GetHashCode() { return Name.GetHashCode(); } } Person person = new Person { Name = "Alice" }; switch (person) { case Person p when p.Name == "Alice": Console.WriteLine("It's Alice."); break; case Person p when p.Name == "Bob": Console.WriteLine("It's Bob."); break; default: Console.WriteLine("Unknown person."); break; }