Question

我有一个基类和派生类，我想自定义派生类的JSON序列化/反序列化，但要在基类中进行序列化/反序列化。我看不到如何用JsonConverter类来做到这一点。

示例类

    public class MyBase
    {
        public long id { get; set; }
        public virtual string name { get; set; }
        public string desc { get; set; }
        ...
    }


    [JsonConverter(typeof(MyDerivedSerializer))]
    public class MyDerived : myBase
    {
        public double rate { get; set; }
        public double temp { get; set; }
        ...
    }

    public class MyDerivedSerializer : JsonConverter
    {
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
          var baseS = value as MyBase;
          //??? How to get JSON for base class

          //Add items for derived class
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            while ((reader.TokenType != JsonToken.Null) && (reader.TokenType != JsonToken.EndObject))
            {
              JObject jo = JObject.Load(reader);
              JToken itemProps = jo["properties"];
              jo.Remove("properties");
              foreach (JToken c in itemProps.Children())
              {
                if (c.Type == JTokenType.Property)
                {
                  JProperty p = c as JProperty;
                  if (!jo.ContainsKey(p.Name))
                    jo[p.Name] = p.Value;
                }
              }
            }
            //now that the JSON is good, how do I put the data in a created derived object
            var x = Activator.CreateInstance(objectType);
            return x;             
        }

        public override bool CanConvert(Type objectType)
        {
          return true;
        }
    }

使用JSON的工具需要在名为“ properties”的子字段中的所有派生类属性，但是我无法更改派生类。因此，我只想使用JsonConveter来编辑JSON即可。

    {
        "id": 33,
        "name": "xSource",
        "desc": "Main source",
        ...
        "properties": {
            "rate": "3.21",
            "temp": "245.2"
            ...
        }

    }

Answer 1

您将需要清理一下，但是我把它吐了

{“ id”：1，“ name”：“ Name”，“ desc”：“ Desc”，“ properties”：{“ rate”：2.0，“ temp”：3.0}}

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        JToken t = JToken.FromObject((MyBase)value);
        JObject jo = (JObject)t;

        var baseProperties = 
      typeof(MyBase).GetProperties(System.Reflection.BindingFlags.Public
       | System.Reflection.BindingFlags.Instance
       | System.Reflection.BindingFlags.DeclaredOnly);

        var derivedProperties = 
 typeof(MyDerived).GetProperties(System.Reflection.BindingFlags.Public
 | System.Reflection.BindingFlags.Instance
 | System.Reflection.BindingFlags.DeclaredOnly);

      var derivedValues =   jo.Properties().Where(x => derivedProperties.Any(y => y.Name == x.Name));
        var baseValues = jo.Properties().Where(x => baseProperties.Any(y => y.Name == x.Name)).ToList();
        JObject o = new JObject(baseValues);
        o.Add(new JProperty("properties", new JObject(derivedValues)));

        o.WriteTo(writer);

    }

必须从类中删除装饰器，然后移到反序列化调用，就像获得stackoverflow一样。

var result = JsonConvert.SerializeObject(test, new KeysJsonConverter());

JsonConverter调用获取基类json并添加自定义

1 个答案: