基于JSON.NET为Enum实现数据与界面分离

　　　　在日常做项目过程中，一直很烦恼枚举值显示问题。当添加，修改，删除枚举值时，都要去修改界面原先的中文表述，很是麻烦。今天针对Enum做相应的扩展，并实现Newtonsoft.Json（JSON.NET）JsonConverter个性化定制，使数据与界面分离，此方法适用于依赖Json数据结构传输数据的应用开发，例如：web 开发。

1、首先，实现Localization属性标签

 [AttributeUsage(AttributeTargets.Field)]    public class LocalizationAttribute : Attribute    {        public LocalizationAttribute(string showValue)        {            ShowValue = showValue;        }        public string ShowValue { get; set; }    }

2、实现JsonConverter，将原先enum转换结果改成｛Value:[int],ShowValue:[string]｝

 public class EnumLocalizationConverter : JsonConverter    {        public override bool CanConvert(Type objectType)        {            return objectType.IsEnum;        }        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)        {            try            {                var value = serializer.Deserialize<EnumLocalization>(reader);                return Enum.Parse(objectType, value.Value.ToString());            }            catch            {            }                        return Enum.Parse(objectType, serializer.Deserialize(reader).ToString());        }        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)        {            var type = value.GetType();            var fieldName = type.GetEnumName(value);            if (fieldName != null)            {                var localozation = type.GetField(fieldName).GetCustomAttribute<LocalizationAttribute>();                serializer.Serialize(writer, new { Value = value, ShowValue = localozation.ShowValue });            }            else            {                serializer.Serialize(writer, new EnumLocalization() { Value = value, ShowValue = string.Empty });            }        }    }

    public class EnumLocalization    {        public object Value { get; set; }        public string ShowValue { get; set; }    }

3、实现Enum静态扩展功能（获取标记上的文本）

    public static class EnumLocalizationExtensions    {        public static string ToLocalizationString(this Enum _this)        {            var type = _this.GetType();            return type.GetField(_this.ToString()).GetCustomAttribute<LocalizationAttribute>().ShowValue;        }        public static IDictionary<int, string> GetLocalizations(this Enum _this)        {            var type = _this.GetType();            var arr = type.GetEnumValues();            Dictionary<int, string> dict = new Dictionary<int, string>();            foreach (int i in arr)            {                var enumValue = Enum.Parse(type, i.ToString()) as Enum;                dict.Add(i, enumValue.ToLocalizationString());            }            return dict;        }    }

4、使用

   public enum LogType    {        [Localization("登录")]        Login = 1,        [Localization("退出")]        Exit = 2,        [Localization("添加")]        Add = 3,        [Localization("删除")]        Delete = 4,        [Localization("修改")]        Edit = 5,        [Localization("测试")]        Test = 6,        [Localization("异常")]        Exception = 7    }

  public class Log    {        public int Id { get; set; }        public UserModel User { get; set; }        [JsonConverter(typeof(EnumLocalizationConverter))]        public LogType Type { get; set; }        public Guid UId { get; set; }        public string Summary { get; set; }        public string Clientip { get; set; }        public string ServerName { get; set; }        public DateTime CreateDT { get; set; }    }