枚举的简单使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class enumtest : System.Web.UI.Page
{
    enum Color        //枚举的使用例子
    {
        Red,
        Green,
        Blue = 10,
        Black
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = ColorValue(Color.Red);   //枚举默认输出为0
        Label2.Text = ColorValue(Color.Green); //枚举自动赋予比文本上位于它前面的成员大 1 的值,这里为1
        Label3.Text = ColorValue(Color.Blue); //枚举值为显示赋值,这里为10
        Label4.Text = ColorValue(Color.Black);//枚举枚举自动赋予比文本上位于它前面的成员大 1 的值,这里为11
    }
    static string ColorValue(Color c)
    {
        switch (c)
        {
            case Color.Red:
                return String.Format("Red = {0}", (int)c);
            case Color.Green:
                return String.Format("Green = {0}", (int)c);
            case Color.Blue:
                return String.Format("Blue = {0}", (int)c);
            case Color.Black:
                return String.Format("Black = {0}", (int)c);
            default:
                return "No color";
        }
    }
}