C# Enum枚举类型操作扩展类

使用示例：

using System.ComponentModel;

namespace SchoolEnterpriseManageSys.Enum
{
    /// <summary>
    /// 申报级别
    /// </summary>
    public enum ReportLevel : int
    {
        /// <summary>
        /// 校
        /// </summary>
        [Description("校")]
        School = 2,
        /// <summary>
        /// 省
        /// </summary>
        [Description("省")]
        Province = 4,
        /// <summary>
        /// 部
        /// </summary>
        [Description("部")]
        Ministry = 8

    }
}

 获取枚举Description值：EnumExtensions.GetDescription(...)

using System;
using System.ComponentModel.DataAnnotations;

namespace SchoolEnterpriseManageSys.Project.Dto
{
    public class BeAssociatedProjectDto
    {
        public Guid Id { get; set; }
        /// <summary>
        /// 类型
        /// </summary>
        public Enum.ProjectType Type { get; set; }
        public string TypeText
        {
            get
            {
                return Utilities.EnumHelper.EnumExtensions.GetDescription(this.Type);
            }
        }
        /// <summary>
        /// 类型标识
        /// </summary>
        public Guid ProjectTypeId { get; set; }
        /// <summary>
        /// 项目编号
        /// </summary>
        [StringLength(32)]
        public string Number { get; set; }
        /// <summary>
        /// 项目名称
        /// </summary>
        [StringLength(32)]
        public string ProjectName { get; set; }
        /// <summary>
        /// 关联项目标识 
        /// </summary>
        public Guid? RelateProjectId { get; set; }
        /// <summary>
        /// 创建时间
        /// </summary>
        public DateTime CreateTime { get; set; }
    }
}

 以下是源代码  

1、ArrayExtensions.cs

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

namespace UUT.TeamCenter.Utility.EnumHelper
{
    /// <summary>
    /// 数组，队列对象的列表类
    /// </summary>
    public static class ArrayExtensions
    {
        /// <summary>
        /// 扩展 Dictionary 根据Value反向查找Key的方法
        /// </summary>
        public static T1 Get<T1, T2>(this IEnumerable<KeyValuePair<T1, T2>> list, T2 t2)
        {
            foreach (KeyValuePair<T1, T2> obj in list)
                if (obj.Value.Equals(t2)) return obj.Key;
            return default(T1);
        }

        /// <summary>
        /// 扩展数组方法 可以在前或者后插入一个对象
        /// </summary>
        /// <param name="obj">要插入的对象</param>
        /// <param name="place">位置 after/before</param>
        /// <returns></returns>
        public static IEnumerable<T> Inject<T>(this IEnumerable<T> list, T obj, ArrayInjectPlace place = ArrayInjectPlace.Top)
        {
            T[] list2 = new T[list.Count() + 1];
            int index = 0;
            foreach (T t in list)
            {
                list2[place == ArrayInjectPlace.Bottom ? index : index + 1] = t;
            }
            list2[place == ArrayInjectPlace.Bottom ? list.Count() : 0] = obj;
            return list2;
        }

        /// <summary>
        /// 将数组合并成为一个字符串
        /// </summary>
        public static string Join<T>(this IEnumerable<T> list, char? c = ',')
        {
            return list.Join(c.ToString());
        }

        public static string Join<T>(this IEnumerable<T> list, string split)
        {
            return string.Join(split, list);
        }
        /// <summary>
        /// 按指定条件过滤数组
        /// </summary>
        /// <param name="ac">默认为过滤重复</param>
        public static IEnumerable<T> Filter<T>(this IEnumerable<T> list, ArrayFilterRule filterRule = ArrayFilterRule.NoRepeater)
        {
            List<T> list2 = new List<T>();
            foreach (T t in list)
            {
                if (!list2.Contains(t)) list2.Add(t);
            }
            return list2;
        }
        /// <summary>
        /// 合并数组 并且去除重复项
        /// </summary>
        /// <param name="converter">要比较的字段</param>
        public static List<T> Merge<T, TOutput>(this IEnumerable<T> objList, Converter<T, TOutput> converter, params IEnumerable<T>[] objs)
        {
            List<T> list = objList.ToList();
            foreach (var obj in objs)
            {
                list.AddRange(obj.ToList().FindAll(t => !list.Exists(t1 => converter(t1).Equals(converter(t)))));
            }
            return list;
        }



        /// <summary>
        /// 获取数组的索引项。 如果超出则返回类型的默认值
        /// </summary>
        public static T GetIndex<T>(this IEnumerable<T> list, int index)
        {
            if (list == null || index >= list.Count() || index < 0) return default(T);
            return list.ToArray()[index];
        }

        /// <summary>
        /// 把数组所有元素，按照“参数=参数值”的模式用“＆”字符拼接成字符串
        /// </summary>
        /// <typeparam name="TKey"></typeparam>
        /// <typeparam name="TValue"></typeparam>
        /// <param name="list"></param>
        public static string ToQueryString<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> list)
        {
            return list.ToList().ConvertAll(t => string.Format("{0}={1}", t.Key, t.Value)).Join("&");
        }

        /// <summary>
        /// 除去数组中的空值和指定名称的参数并以字母a到z的顺序排序
        /// </summary>
        /// <param name="filter">过滤规则 默认做为空判断</param>
        public static IEnumerable<KeyValuePair<TKey, TValue>> Filter<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> list, Func<TKey, TValue, bool> filter = null)
        {
            if (filter == null)
            {
                filter = (key, value) =>
                {
                    return !string.IsNullOrEmpty(key.ToString()) && value != null;
                };
            }
            foreach (var item in list)
            {
                if (filter(item.Key, item.Value))
                    yield return new KeyValuePair<TKey, TValue>(item.Key, item.Value);
            }
        }

        /// <summary>
        /// 不包含指定的Key
        /// </summary>
        public static IEnumerable<KeyValuePair<TKey, TValue>> Filter<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> list, params TKey[] filter)
        {
            return list.Filter((key, value) =>
            {
                return !string.IsNullOrEmpty(key.ToString()) && value != null && !filter.Contains(key);
            });
        }

        /// <summary>
        /// 按照Key从小大大拍列
        /// </summary>
        /// <typeparam name="TKey"></typeparam>
        /// <typeparam name="TValue"></typeparam>
        /// <param name="list"></param>
        public static void Sort<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> list)
        {
            list = list.ToList().OrderBy(t => t.Key);
        }

        /// <summary>
        /// 获取父级的继承树（最多支持32级）
        /// 包括自己
        /// </summary>
        /// <typeparam name="TValue">主键类型</typeparam>
        /// <param name="obj">要查找的数组对象</param>
        /// <param name="id">当前对象的主键值</param>
        /// <param name="value">主键字段</param>
        /// <param name="parent">父级字段</param>
        /// <returns></returns>
        public static List<T> GetParent<T, TValue>(this List<T> obj, TValue id, Func<T, TValue> value, Func<T, TValue> parent)
        {
            int count = 0;
            T t = obj.Find(m => value.Invoke(m).Equals(id));
            List<T> list = new List<T>();
            while (t != null)
            {
                if (count > 32) break;
                list.Add(t);
                t = obj.Find(m => value.Invoke(m).Equals(parent.Invoke(t)));
                count++;
            }
            return list;
        }

        /// <summary>
        /// 获取子集列表（包括自己）
        /// </summary>
        public static void GetChild<T, TValue>(this List<T> obj, TValue id, Func<T, TValue> value, Func<T, TValue> parent, ref List<T> list)
        {
            if (list == null) list = new List<T>();
            var objT = obj.Find(t => value.Invoke(t).Equals(id));
            if (objT != null)
            {
                list.Add(objT);
                foreach (T t in obj.FindAll(m => parent.Invoke(m).Equals(id)))
                {
                    obj.GetChild(value.Invoke(t), value, parent, ref list);
                }
            }
        }

        /// <summary>
        /// 获取树形结构的子集执行方法
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="TValue"></typeparam>
        /// <param name="obj">当前对象</param>
        /// <param name="id">当前父节点</param>
        /// <param name="value">获取主键的委托</param>
        /// <param name="parent">获取父值的委托</param>
        /// <param name="action">委托执行的方法 int 为当前的深度</param>
        /// <param name="depth">当前的深度</param>
        public static void GetTree<T, TValue>(this List<T> obj, TValue id, Func<T, TValue> value, Func<T, TValue> parent, Action<T, int> action, int depth = 0)
        {
            foreach (T t in obj.FindAll(m => parent.Invoke(m).Equals(id)))
            {
                action.Invoke(t, depth + 1);
                obj.GetTree(value.Invoke(t), value, parent, action, depth + 1);
            }
        }


    }
    /// <summary>
    /// 数组过滤规则
    /// </summary>
    public enum ArrayFilterRule
    {
        /// <summary>
        /// 过滤重复
        /// </summary>
        NoRepeater
    }

    /// <summary>
    /// 插入数组的位置
    /// </summary>
    public enum ArrayInjectPlace
    {
        /// <summary>
        /// 在顶部插入
        /// </summary>
        Top,
        /// <summary>
        /// 在尾部追加
        /// </summary>
        Bottom
    }
}

2、EnumExtensions.cs

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

namespace EnumHelper
{
    /// <summary>
    /// 枚举扩展
    /// </summary>
    public static class EnumExtensions
    {
        private static ConcurrentDictionary<Enum, string> _concurrentDictionary = new ConcurrentDictionary<Enum, string>();
        private static ConcurrentDictionary<Type, Dictionary<string, string>> _concurrentDicDictionary = new ConcurrentDictionary<Type, Dictionary<string, string>>();
        /// <summary>
        /// 锁对象
        /// </summary>
        private static object objLock = new object();

        /// <summary>
        /// 获取枚举的描述信息(Descripion)。
        /// 支持位域，如果是位域组合值，多个按分隔符组合。
        /// </summary>
        public static string GetDescription(this Enum @this)
        {
            return _concurrentDictionary.GetOrAdd(@this, (key) =>
            {
                var type = key.GetType();
                var field = type.GetField(key.ToString());
                //如果field为null则应该是组合位域值，
                return field == null ? key.GetDescriptions() : GetDescription(field);
            });
        }
        /// <summary>
        /// 获取枚举的说明
        /// </summary>
        /// <param name="split">位枚举的分割符号（仅对位枚举有作用）</param>
        public static string GetDescriptions(this Enum em, string split = ",")
        {
            var names = em.ToString().Split(',');
            string[] res = new string[names.Length];
            var type = em.GetType();
            for (int i = 0; i < names.Length; i++)
            {
                var field = type.GetField(names[i].Trim());
                if (field == null) continue;
                res[i] = GetDescription(field);
            }
            return string.Join(split, res);
        }
        private static string GetDescription(FieldInfo field)
        {
            var att = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute), false);
            return att == null ? field.Name : ((DescriptionAttribute)att).Description;
        }

        /// <summary>
        /// 把枚举转换成为列表
        /// </summary>
        public static List<EnumObject> ToList(this Type type)
        {
            List<EnumObject> list = new List<EnumObject>();
            foreach (object obj in Enum.GetValues(type))
            {
                list.Add(new EnumObject((Enum)obj));
            }
            return list;
        }

        /// <summary>
        /// 构造UTable枚举json样式 eg.{"Resource":{"value":0,"name":"Resource","text":"自有资源"},"New":{"value":1,"name":"New","text":"业务费用"}}
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public static Dictionary<string, EnumModel> GetEnumList(this Type type)
        {
            Dictionary<string, EnumModel> list = new Dictionary<string, EnumModel>();
            foreach (object obj in Enum.GetValues(type))
            {
                list.Add(((Enum)obj).ToString(), new EnumModel((Enum)obj));
            }
            return list;
        }

        ///<summary>  
        /// 获取枚举值+描述  
        ///</summary>  
        ///<param name="enumType">Type,该参数的格式为typeof(需要读的枚举类型)</param>  
        ///<returns>键值对</returns>  
        public static Dictionary<string, string> GetEnumItemValueDesc(Type enumType)
        {
            Dictionary<string, string> dic = new Dictionary<string, string>();
            Type typeDescription = typeof(DescriptionAttribute);
            FieldInfo[] fields = enumType.GetFields();
            string strText = string.Empty;
            string strValue = string.Empty;
            foreach (FieldInfo field in fields)
            {
                if (field.FieldType.IsEnum)
                {
                    strValue = ((int)enumType.InvokeMember(field.Name, BindingFlags.GetField, null, null, null)).ToString();
                    object[] arr = field.GetCustomAttributes(typeDescription, true);
                    if (arr.Length > 0)
                    {
                        DescriptionAttribute aa = (DescriptionAttribute)arr[0];
                        strText = aa.Description;
                    }
                    else
                    {
                        strText = field.Name;
                    }
                    dic.Add(strValue, strText);
                }
            }

            return dic;


        }

        /// <summary>
        /// 获取枚举类型键值对
        /// </summary>
        /// <param name="em"></param>
        /// <returns></returns>
        public static Dictionary<string, string> GetEunItemValueAndDesc(Type em)
        {
            return _concurrentDicDictionary.GetOrAdd(em, (key) =>
            {
                var type = key.GetType();
                if (_concurrentDicDictionary.ContainsKey(key))
                    return _concurrentDicDictionary[key];
                else
                    return GetEnumItemValueDesc(em);
            });
        }
        ///<summary>  
        /// 获取枚举项+描述  
        ///</summary>  
        ///<param name="enumType">Type,该参数的格式为typeof(需要读的枚举类型)</param>  
        ///<returns>键值对</returns>  
        public static Dictionary<string, string> GetEnumItemDesc(Type enumType)
        {
            Dictionary<string, string> dic = new Dictionary<string, string>();
            FieldInfo[] fieldinfos = enumType.GetFields();
            foreach (FieldInfo field in fieldinfos)
            {
                if (field.FieldType.IsEnum)
                {
                    Object[] objs = field.GetCustomAttributes(typeof(DescriptionAttribute), false);
                    dic.Add(field.Name, ((DescriptionAttribute)objs[0]).Description);
                }
            }
            return dic;
        }
        /// <summary>  
        /// 获取枚举项描述信息 例如GetEnumDesc(Days.Sunday)  
        /// </summary>  
        /// <param name="en">枚举项 如Days.Sunday</param>  
        /// <returns></returns>  
        public static string GetEnumDesc(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(DescriptionAttribute), false);
                if (attrs != null && attrs.Length > 0)
                    return ((DescriptionAttribute)attrs[0]).Description;
            }
            return en.ToString();
        }

        /// <summary>
        /// 将注释转换成枚举值，匹配不上返回Null
        /// </summary>
        /// <param name="type"></param>
        /// <param name="strDescription"></param>
        /// <returns></returns>
        public static int? GetEnumValByDescription(this Type type, string strDescription)
        {
            int? enumVal = null;
            foreach (object obj in Enum.GetValues(type))
            {
                Enum nEnum = (Enum)obj;
                if (nEnum.GetDescription() == strDescription)
                {
                    enumVal = (int)Convert.ChangeType(nEnum, typeof(int));
                }
            }
            return enumVal;
        }
    }
}

3、EnumModel.cs

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

namespace UUT.TeamCenter.Utility.EnumHelper
{
    public struct EnumModel
    {
        public EnumModel(Enum um)
        {
            this.value = (int)Convert.ChangeType(um, typeof(int));
            this.name = um.ToString();
            this.text = um.GetDescription();
        }
        public int value { get; set; }
        public string name { get; set; }
        public string text { get; set; }
    }
}

4、EnumObject.cs

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

namespace UUT.TeamCenter.Utility.EnumHelper
{
    /// <summary>
    /// 枚举、类型的值
    /// </summary>
    public struct EnumObject
    {
        public EnumObject(Enum um, string picture = null)
        {
            this.ID = (int)Convert.ChangeType(um, typeof(int));
            this.Name = um.ToString();
            this.Description = um.GetDescription();
            this.Picture = picture;
        }

        public EnumObject(int id, string name)
        {
            this.ID = id;
            this.Name = this.Description = name;
            this.Picture = null;
        }

        public EnumObject(int id, string name, string description, string picture)
        {
            this.ID = id;
            this.Name = name;
            this.Description = description;
            this.Picture = picture;
        }

        public int ID;

        public string Name;

        public string Description;

        public string Picture;
    }
}