枚举的总结

直接上代码：

namespace EnumStudy
{
    public enum Days:byte//枚举继承什么类型就是什么类型
    {
        [Description("星期1")]
        Monday=1,
        [Description("星期2")]
        Tuesday,
        [Description("星期3")]
        Wednesday,
        [Description("星期4")]
        Thursday,
        [Description("星期5")]
        Friday,
        [Description("星期6")]
        Saturday,
        [Description("星期7")]
        Sunday,
    }


}

使用：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EnumStudy
{
    public class UseerEnum
    {
        public void Run()
        {
            //枚举转字符串
            string foo = Days.Saturday.ToString();//"Saturday"
            string foo1 = Enum.GetName(typeof(Days),6);//"Saturday"

            //字符串转枚举
            Enum.TryParse("Saturday",out Days bar);//true,bar=Days.Saturday
            Days day = (Days)Enum.Parse(typeof(Days), "Saturday");// Days.Saturday

            //枚举转数字
            byte foo2 = (byte)Days.Friday;//5

            //数字转枚举
            Days foo3=(Days)2;//Days.Tuesday

            //获取枚举所属类型
            Type foo4 = Enum.GetUnderlyingType(typeof(Days));

            //获取所有枚举成员
            Array foo5 = Enum.GetValues(typeof(Days));

            //获取所有枚举成员的字段名
            string[] foo6 = Enum.GetNames(typeof(Days));


            //默认值
            Days d = (Days)21;//不会报错
            Enum.IsDefined(typeof(Days), d);//false

            //枚举默认值永远为0
            var z = default(Days);

            //获取枚举描述
            string des = GetDescription(Days.Friday);

        }

        public  string GetDescription(Enum val)
        {
            var field = val.GetType().GetField(val.ToString());
            var customAttribute = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute));
            if (customAttribute == null) { return val.ToString(); }
            else { return ((DescriptionAttribute)customAttribute).Description; }
        }
    }
}