juipnet/Infrastructure/Hncore.Infrastructure/Extension/EnumExtension.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;

namespace Hncore.Infrastructure.Extension
{
    public static class EnumExtension
    {
        public static Dictionary<int, string> ToDictionary<T>()
        {
            Dictionary<int, string> dic = new Dictionary<int, string>();
            string namestr = "";
            foreach (var e in Enum.GetValues(typeof(T)))
            {
                namestr = "";
               
                object[] objArrDisplay = e.GetType().GetField(e.ToString()).GetCustomAttributes(typeof(DisplayAttribute), true);//Display
                if (objArrDisplay.Any())
                {
                    var da = objArrDisplay[0] as DisplayAttribute;
                    namestr = da.Name;
                }
                else
                {
                    object[] objArrDescription = e.GetType().GetField(e.ToString()).GetCustomAttributes(typeof(DescriptionAttribute), true);//Description
                    namestr = objArrDescription.Any() ? (objArrDescription[0] as DescriptionAttribute).Description : e.ToString();
                }
               int value = Convert.ToInt32(e);
           


               // string str = item.GetDescription();
             //   int value = (int) item;

                dic.Add(value, namestr);
            }

            return dic;
        }
        #region 获取枚举的相关信息的集合
        /// <summary>
        /// 获取枚举的相关信息的集合
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public static List<EnumInfo> EnumToList<T>()
        {
            var list = new List<EnumInfo>();
            foreach (var e in Enum.GetValues(typeof(T)))
            {
                var m = new EnumInfo();
                object[] objArrDisplay = e.GetType().GetField(e.ToString()).GetCustomAttributes(typeof(DisplayAttribute), true);//Display
                if (objArrDisplay.Any())
                {
                    var da = objArrDisplay[0] as DisplayAttribute;
                    m.Name = da.Name;
                }
                else
                {
                    object[] objArrDescription = e.GetType().GetField(e.ToString()).GetCustomAttributes(typeof(DescriptionAttribute), true);//Description
                    m.Name = objArrDescription.Any() ? (objArrDescription[0] as DescriptionAttribute).Description : e.ToString();
                }
                m.Value = Convert.ToInt32(e);
                list.Add(m);
            }
            return list;
        }
        public class EnumInfo
        {
            public string Name { set; get; }

            public int Value { set; get; }
        }
        #endregion
        public static string GetDisplayName<T>(T enumValue)
        {
            object[] objArrDisplay = enumValue.GetType().GetField(enumValue.ToString())
                ?.GetCustomAttributes(typeof(DisplayAttribute), true);//Display
            if (objArrDisplay!=null&&objArrDisplay.Any())
            {
                var da = objArrDisplay[0] as DisplayAttribute;
                return  da?.Name;
            }
            return "";
        }
        
        /// <summary>
        /// 获取枚举上通过DisplayName、Description或Display柱注的名称
        /// 优先级为DisplayName>Description>Display
        /// </summary>
        /// <param name="e">枚举值</param>
        /// <returns>枚举名称</returns>
        /// 
        public static string GetEnumDisplayName(this Enum e)
        {
            try
            {
                Type t = e.GetType();
                FieldInfo fi = t.GetField(Enum.GetName(t, e));
                var dna = fi.GetCustomAttribute<DisplayNameAttribute>();
                if (dna != null)
                    return dna.DisplayName;
                var da = fi.GetCustomAttribute<DescriptionAttribute>();
                if (da != null)
                    return da.Description;
                var d = fi.GetCustomAttribute<DisplayAttribute>();
                if (d != null)
                    return d.Name;
            }
            catch (Exception ex)
            {
                return "获取枚举"+e.GetType().FullName+"名称错误："+ex.Message;
            }
            return "";
        }
        
        public static string ToHtmlSelectOptions<T>()
        {
            var dic = ToDictionary<T>();

            string str = "";

            foreach (var key in dic.Keys)
            {
                str += "<option value=\"" + key + "\">" + dic[key] + "</option>";
            }

            return str;
        }

        #region 判断值是否在枚举类型中存在

        /// <summary>
        /// 判断值是否在枚举中存在
        /// </summary>
        /// <param name="enumValue">需要判断的参数</param>
        /// <param name="enumType">枚举类型</param>
        /// <returns></returns>
        public static bool IsExist(this int enumValue, Type enumType)
        {
            return Enum.IsDefined(enumType, enumValue);
        }

        #endregion
    }
}