C#枚举

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C#中的枚举也称为枚举。它用于存储一组命名常量，如季节、天、月、大小等。枚举常量也称为枚举数。C#中的枚举可以在类和结构内部或外部声明。

枚举常量具有默认值，从0开始逐个递增。但是无涯教程可以更改默认值。

要记住的要点

枚举有固定的常量集
枚举提高了安全性
枚举可以遍历

C#枚举示例

让无涯教程看一个简单的C#枚举示例。

复制代码

using System;
public class EnumExample
{
    public enum Season { WINTER, SPRING, SUMMER, FALL }  

    public static void Main()
    {
        int x = (int)Season.WINTER;
        int y = (int)Season.SUMMER;
        Console.WriteLine("WINTER = {0}", x);
        Console.WriteLine("SUMMER = {0}", y);
    }
}

WINTER = 0
SUMMER = 2

更改起始索引的C#枚举示例

复制代码

using System;
public class EnumExample
{
    public enum Season { WINTER=10, SPRING, SUMMER, FALL }  

    public static void Main()
    {
        int x = (int)Season.WINTER;
        int y = (int)Season.SUMMER;
        Console.WriteLine("WINTER = {0}", x);
        Console.WriteLine("SUMMER = {0}", y);
    }
}

WINTER = 10
SUMMER = 12

C#枚举天数示例

复制代码

using System;
public class EnumExample
{
    public enum Days { Sun, Mon, Tue, Wed, Thu, Fri, Sat };

    public static void Main()
    {
        int x = (int)Days.Sun;
        int y = (int)Days.Mon;
        int z = (int)Days.Sat;
        Console.WriteLine("Sun = {0}", x);
        Console.WriteLine("Mon = {0}", y);
        Console.WriteLine("Sat = {0}", z);
    }
}

Sun = 0
Mon = 1
Sat = 6

C#枚举示例：使用getNames()遍历所有值

复制代码

using System;
public class EnumExample
{
    public enum Days { Sun, Mon, Tue, Wed, Thu, Fri, Sat };

    public static void Main()
    {
        foreach (string s in Enum.GetNames(typeof(Days)))
        {
            Console.WriteLine(s);
        }
    }
}

Sun
Mon
Tue
Wed
Thu
Fri
Sat

C#枚举示例：使用getValues()遍历所有值

复制代码

using System;
public class EnumExample
{
    public enum Days { Sun, Mon, Tue, Wed, Thu, Fri, Sat };

    public static void Main()
    {
        foreach (Days d in Enum.GetValues(typeof(Days)))
        {
            Console.WriteLine(d);
        }
    }
}

Sun
Mon
Tue
Wed
Thu
Fri
Sat

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