深入理解C#之枚举

   enum sex : byte　　//显示指定枚举的底层数据类型
    { 
        male,
        female,　　//此逗号可以省略
    };　　　　　　  //此分号可以省略

enum Week
    { 
        Monday = 1,
        Tuesday = 2,
        Wednesday = 3,
        Sunday = 0,
　　　　 Everyday = 1　　//成员的值可以设置成一样的，但是成员不行
    }
　　Console.WriteLine((int)Week.Monday);　　//获取值

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Enum.GetName(typeof(Man),1));  //还是 刘备 (由值获取名字)
            string[] array1 = Enum.GetNames(typeof(Man));
            Console.WriteLine(array1[1]);   //关羽
            Array array2 = Enum.GetValues(typeof(Man));
            Console.WriteLine(array2.GetValue(1));  //还是关羽
            Type t = Enum.GetUnderlyingType(typeof(Man));
            Console.WriteLine(t);       //输出 Int32
            //由值获取内容
            int i = 1;
            string Name = Enum.Parse(typeof(Man), i.ToString()).ToString();     //此时 Name="刘备"
            Console.WriteLine(Name);
            //由值获取内容
            string Name2 = "关羽";
            int j = Convert.ToInt32(Enum.Parse(typeof(Man), Name2));     //此时 j=2
            Console.WriteLine(j);
            Console.ReadKey();
        }
    }
    enum Man
    { 
        刘备 = 1,
        关羽 = 2,
        张飞 = 3
    }

  class Program
    {
        static void Main(string[] args)
        {
            var man = Week.白 | Week.美;  //赋值为101    计算方法001或上100,结果是101
            Console.WriteLine((int)man);
            if ((man & Week.白) == Week.白)       //101 man 
            {                                    //001 白 逐位相与，
                Console.WriteLine("此人白");      //001 如果结果是白，就可以反推出man包含 白
            }
            else
            {
                Console.WriteLine("此人黑");
            }
            Console.ReadKey();
        }
    }
    [System.Flags]
    public enum Week
    { 
        白 = 1,  //001
        富 = 2,  //010
        美 = 4,  //100
    }

select * from Table1 where Tag & 1 = 1　　//Tag是列名
select * from Table1 where  Tag | 1 = Tag

namespace MvcStart.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult GetSexList()
        {
            Dictionary<string, int> Sexlist = new Dictionary<string, int>();
            string[] keys = Enum.GetNames(typeof(sex));
            Array values = Enum.GetValues(typeof(sex));
            for (int i = 0; i < keys.Length; i++)
            {
                Sexlist.Add(keys[i], (int)values.GetValue(i));
            }
            return View(Sexlist);
        }
    }
    public enum sex
    { 
        male = 1,
        female = 2,
        other = 3
    }
}

@model Dictionary<string, int>
<select>
    @foreach(var item in @Model)
    {
        <option value="@item.Value">@item.Key</option>
    }
</select>

<select>
        <option value="1">male</option>
        <option value="2">female</option>
        <option value="3">other</option>
</select>

public static class GetDescription
    {
        /// <summary>
        /// 获取描述信息
        /// </summary>
        /// <param name="en"></param>
        /// <returns></returns>
        public static string description(this Enum en)
        {
            Type type = en.GetType();
            MemberInfo[] memInfo = type.GetMember(en.ToString());
            if (memInfo != null && memInfo.Length > 0)
            {
                object[] attrs = memInfo[0].GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), false);
                if (attrs != null && attrs.Length > 0)
                    return ((DescriptionAttribute)attrs[0]).Description;
            }
            return en.ToString();
        }
    }
    public enum Sex
    {
        [Description("男")]
        man = 1,
        [Description("女")]
        woman = 2,
        [Description("其他")]
        other = 3
    }