How to serialize object to json with type info using Newtonsoft.Json?

Question

I want to have a property with type name in JSON when I serialize objects of certain types. I wrote a converter:

public class TypeInfoConverter : JsonConvert         


        

Answer 1

var jsonSerializerSettings = new JsonSerializerSettings() { 
    TypeNameHandling = TypeNameHandling.All
};
var json = JsonConvert.SerializeObject(instance, jsonSerializerSettings);

http://james.newtonking.com/json/help/index.html?topic=html/SerializationSettings.htm

Answer 2

Have you tried creating a new instance of JsonSerializer, then copying all the converters from the original serializer except the converter that causes the infinite recursion?

public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
    JsonSerializerSettings settings = new JsonSerializerSettings
    {
        Converters = serializer.Converters.Where(s => !(s is TypeInfoConverter)).ToList()
        // also copy any other custom settings from the serializer you wish to pass through
        DateFormatHandling = serializer.DateFormatHandling,
        MissingMemberHandling = serializer.MissingMemberHandling,
        NullValueHandling = serializer.NullValueHandling,
        Formatting = serializer.Formatting
    };
    var localSerializer = JsonSerializer.Create(settings);

    var jObject = JObject.FromObject(value, localSerializer);
    jObject.AddFirst(new JProperty("Type", value.GetType().Name));
    jObject.WriteTo(writer);
}

Answer 3

public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) 
    var converters = serializer.Converters.Where(x => !(x is TypeInfoConverter)).ToArray();

    var jObject = JObject.FromObject(value);
    jObject.AddFirst(new JProperty("Type", value.GetType().Name));
    jObject.WriteTo(writer, converters);
}