using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

​

    // https://stackoverflow.com/questions/29719509/json-net-throws-stackoverflowexception-when-using-jsonconvert

​

    [JsonConverter(typeof(FJson))]

    public class A

    {

        public A()

        {

            this.b = new B();

        }

​

        public int id { get; set; }

        public string name { get; set; }

​

        [JsonConverter(typeof(BConverter))]

        public B b { get; set; }

    }

​

    public class B

    {

        public string name { get; set; }

    }

​

    public static partial class JsonExtensions

    {

        public static JToken DefaultFromObject(this JsonSerializer serializer, object value)

        {

            if (value == null)

                return JValue.CreateNull();

            var dto = Activator.CreateInstance(typeof(DefaultSerializationDTO<>).MakeGenericType(value.GetType()), value);

            var root = JObject.FromObject(dto, serializer);

            return root["Value"].RemoveFromLowestPossibleParent() ?? JValue.CreateNull();

        }

​

        public static object DefaultToObject(this JToken token, Type type, JsonSerializer serializer = null)

        {

            var oldParent = token.Parent;

            var dtoToken = new JObject(new JProperty("Value", token));

            var dtoType = typeof(DefaultSerializationDTO<>).MakeGenericType(type);

            var dto = (IHasValue)(serializer ?? JsonSerializer.CreateDefault()).Deserialize(dtoToken.CreateReader(), dtoType);

            if (oldParent == null)

                token.RemoveFromLowestPossibleParent();

            return dto == null ? null : dto.GetValue();

        }

​

        interface IHasValue

        {

            object GetValue();

        }

​

        [JsonObject(NamingStrategyType = typeof(DefaultNamingStrategy), IsReference = false)]

        class DefaultSerializationDTO<T> : IHasValue

        {

            public DefaultSerializationDTO(T value) { this.Value = value; }

​

            public DefaultSerializationDTO() { }

            [JsonConverter(typeof(NoConverter)), JsonProperty(ReferenceLoopHandling = ReferenceLoopHandling.Serialize)]

            public T Value { get; set; }

            object IHasValue.GetValue() { return Value; }

        }

        public static TJToken RemoveFromLowestPossibleParent<TJToken>(this TJToken node) where TJToken : JToken

        {

            if (node == null)

                return null;

            JToken toRemove;

            var property = node.Parent as JProperty;

            if (property != null)

            {

                // Also detach the node from its immediate containing property -- Remove() does not do this even though it seems like it should

                toRemove = property;

                property.Value = null;

            }

            else

            {

                toRemove = node;

            }

            if (toRemove.Parent != null)

                toRemove.Remove();

            return node;

        }

    }

​

    public class NoConverter : JsonConverter

    {

        // NoConverter taken from this answer https://stackoverflow.com/a/39739105/3744182

        // To https://stackoverflow.com/questions/39738714/selectively-use-default-json-converter

        // By https://stackoverflow.com/users/3744182/dbc

        public override bool CanConvert(Type objectType)  { throw new NotImplementedException(); /* This converter should only be applied via attributes */ }

​

        public override bool CanRead { get { return false; } }

​

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

​

        public override bool CanWrite { get { return false; } }

​

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

    }

​

    public class FJson : JsonConverter

    {

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            JToken t = serializer.DefaultFromObject(value);

            // Remainder as before

            if (t.Type != JTokenType.Object)

            {

                t.WriteTo(writer);

                return;

            }

​

            JObject o = (JObject)t;

            writer.WriteStartObject();

            WriteJson(writer, o);

            writer.WriteEndObject();

        }

​

        private void WriteJson(JsonWriter writer, JObject value)

        {

            foreach (var p in value.Properties())

            {

                if (p.Value is JObject)

                    WriteJson(writer, (JObject)p.Value);

                else

                    p.WriteTo(writer);

            }

        }

​

        public override object ReadJson(JsonReader reader, Type objectType,

           object existingValue, JsonSerializer serializer)

        {

            throw new NotImplementedException();

        }

​

        public override bool CanConvert(Type objectType)

        {

            return true; // works for any type

        }

    }

​

    public sealed class BConverter : JsonConverter

    {

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            var obj = (JObject)serializer.DefaultFromObject(value);

            obj["BConverterCalled"] = true;

            obj.WriteTo(writer);

        }

​

        public override bool CanConvert(Type objectType)

        {

            throw new NotImplementedException();

        }

​

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            throw new NotImplementedException();

        }

    }

​

    public class TestClass

    {

        public static void Test()

        {

            A a = new A();

            a.id = 1;

            a.b.name = "value";

​

            var settings = new JsonSerializerSettings

            {

                // Ensure a custom naming strategy doesn't mess up DTO serialization.

                ContractResolver = new CamelCasePropertyNamesContractResolver()

            };

            var jsonFormatted = JsonConvert.SerializeObject(a, Formatting.Indented, settings);

            Console.WriteLine(jsonFormatted);

            var json = JsonConvert.SerializeObject(a, Formatting.None, settings);

            Assert.IsTrue(json == "{\"id\":1,\"name\":null,\"name\":\"value\",\"BConverterCalled\":true}");

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​