從json轉換爲Enum和Newtonsoft C＃

Question

我怎樣才能將json反序列化爲C＃中的枚舉列表？

我寫了下面的代碼：

//json "types" : [ "hotel", "spa" ] 

    public enum eType 
    { 
     [Description("hotel")] 
     kHotel, 
     [Description("spa")] 
     kSpa 
    } 

    public class HType 
    { 
     List<eType> m_types; 

     [JsonProperty("types")] 
     public List<eType> HTypes { 
     get 
      { 
       return m_types; 
      } 
      set 
      { 
      // i did this to try and decide in the setter 
      // what enum value should be for each type 
      // making use of the Description attribute 
      // but throws an exception 
      } 

}}

 //other class 

       var hTypes = JsonConvert.DeserializeObject<HType>(json); 

Answer 1

定製轉換器可能會有幫助。

var hType = JsonConvert.DeserializeObject<HType>(
          @"{""types"" : [ ""hotel"", ""spa"" ]}", 
          new MyEnumConverter()); 

---

public class HType 
{ 
    public List<eType> types { set; get; } 
} 

public enum eType 
{ 
    [Description("hotel")] 
    kHotel, 
    [Description("spa")] 
    kSpa 
} 

public class MyEnumConverter : JsonConverter 
{ 
    public override bool CanConvert(Type objectType) 
    { 
     return objectType == typeof(eType); 
    } 

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) 
    { 
     var eTypeVal = typeof(eType).GetMembers() 
         .Where(x => x.GetCustomAttributes(typeof(DescriptionAttribute)).Any()) 
         .FirstOrDefault(x => ((DescriptionAttribute)x.GetCustomAttribute(typeof(DescriptionAttribute))).Description == (string)reader.Value); 

     if (eTypeVal == null) return Enum.Parse(typeof(eType), (string)reader.Value); 

     return Enum.Parse(typeof(eType), eTypeVal.Name); 
    } 

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) 
    { 
     throw new NotImplementedException(); 
    } 
}