Enum转换为list、获取Enum类型的Description、

朱雀 2022-02-25 10:48 239阅读 0赞

### 一、创建EnumHelper类 ###

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Linq;
    
    namespace Common.EnumHepler
    {
        public static class EnumHelper
        {
            private static string GetEnumDescription<TEnum>(this TEnum eunmObj)
            {
                //获取枚举对象的枚举类型  
                var type = eunmObj.GetType();
                //通过反射获取该枚举类型的所有属性  
                var fieldInfos = type.GetFields();
    
                foreach (var field in fieldInfos)
                {
                    //不是参数obj,就直接跳过  
                    if (field.Name != eunmObj.ToString())
                    {
                        continue;
                    }
                    //取出参数obj的自定义属性  
                    if (!field.IsDefined(typeof(DescriptionAttribute), true)) continue;
                    var descriptionAttribute = field.GetCustomAttributes(typeof(DescriptionAttribute),
                        true)[0] as DescriptionAttribute;
                    if (descriptionAttribute != null)
                        return descriptionAttribute.Description;
                }
                return eunmObj.ToString();
            }
    
            /// <summary>
            /// 枚举转Dictionary
            /// </summary>
            /// <typeparam name="TEnum"></typeparam>
            /// <returns></returns>
            public static IList<EnumResult> EnumToDictionary<TEnum>()
            {
                var enumType = typeof(TEnum);
    
                return (from object obj in Enum.GetValues(enumType)
                        select new EnumResult
                        {
                            Text = GetEnumDescription(obj),
                            Value = (int)obj
                        }).ToList();
            }
    
            /// <summary>
            /// 获取枚举描述
            /// </summary>
            /// <param name="eunmObj"></param>
            /// <returns></returns>
            public static string GetDescription(this Enum eunmObj)
            {
                return GetEnumDescription(eunmObj);
            }
        }
    
        public class EnumResult
        {
            public string Text { get; set; }
            public int Value { get; set; }
        }
    }

### 二、调用 ###

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Linq;
    using Common.EnumHepler;
    
    namespace API.Controllers
    {
        
        public class EnumController 
        {
           
            public void GetDescription()
            {
                string manDesc = EnumHelper.GetDescription(Sex.man);
                //manDesc = "男"
                string womamDesc = EnumHelper.GetDescription(Sex.womam);
                //womamDesc = "女"
            }
            
            public void EnumToDictionary()
            {
                IList<EnumResult> obj = EnumHelper.EnumToDictionary<Sex>();
            }
        }
    
    
        public enum Sex
        {
            [Description("男")]
            man = 1,
            [Description("女")]
            womam
        }
    }

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