JSON.net (de)serialize untyped property

Question

Suppose I have a class like this:

public class Example {
    public int TypedProperty { get; set; }
    public object UntypedProperty { get; set; }
}
         


        

Answer 1

Lookup SerializeWithJsonConverters.htm and ReadingWritingJSON. Call: JsonConvert.SerializeObject(example, new ObjectConverter());

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

public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
  throw new NotImplementedException();
}

public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
  Example e = (Example)value;

  writer.WriteStartObject();

  writer.WritePropertyName("TypedProperty");
  writer.WriteValue(e.TypedProperty);

  writer.WritePropertyName("UntypedProperty");
  writer.WriteStartObject();

  writer.WritePropertyName("$type");
  writer.WriteValue(e.UntypedProperty.GetType().FullName);

  writer.WritePropertyName("$value");
  writer.WriteValue(e.UntypedProperty.ToString());

  writer.WriteEndObject();

  writer.WriteEndObject();
}
}