#define TESTING

​

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 System.Globalization;

​

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/60995986/nested-jobjects-getting-serialized-as-empty-arrays

​

    public class ForeignJsonNetContainerConverter : ForeignJsonNetBaseConverter

    {

        static readonly string [] Names = new []

        {

            "Newtonsoft.Json.Linq.JObject",

            "Newtonsoft.Json.Linq.JArray",

            "Newtonsoft.Json.Linq.JConstructor",

            "Newtonsoft.Json.Linq.JRaw",

        };

        protected override IReadOnlyCollection<string> TypeNames { get { return Names; } }

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

        {

            var json = value.ToString();

            // Fix indentation

            using (var stringReader = new StringReader(json))

            using (var jsonReader = new JsonTextReader(stringReader))

            {

                writer.WriteToken(jsonReader);

            }

        }

    }

​

    public class ForeignJsonNetValueConverter : ForeignJsonNetBaseConverter

    {

        static readonly string [] Names = new []

        {

            "Newtonsoft.Json.Linq.JValue",

        };

        protected override IReadOnlyCollection<string> TypeNames { get { return Names; } }

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

        {

            var underlyingValue = ((dynamic)value).Value;

            if (underlyingValue == null)

            {

                writer.WriteNull();

            }

            else

            {

                // JValue.ToString() will be wrong for DateTime objects, we need to serialize them instead.

                serializer.Serialize(writer, underlyingValue);

            }

        }

    }

​

    public abstract class ForeignJsonNetBaseConverter : JsonConverter

    {

        protected abstract IReadOnlyCollection<string> TypeNames { get; }

        public override bool CanConvert(Type objectType)

        {

            if (objectType.IsPrimitive)

                return false;

#if !TESTING                

            // Do not use the converter for Native JToken types, only non-native types with the same name(s).

            if (objectType == typeof(JToken) || objectType.IsSubclassOf(typeof(JToken)))

                return false;

#endif              

            var fullname = objectType.FullName;

            if (TypeNames.Contains(fullname))

                return true;

            return false;

        }

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

​

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

        {

            throw new NotImplementedException();

        }

    }

​

    //

​

    public class JobSummary {

        public Job Job { get; set; }    

    }

​

    public class Job {

        public Status Status { get; set; }

    }

​

    public class Status {

        public object JobOutput { get; set; }

        public int Progress { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var summary = new JobSummary

            {

                Job = new Job

                {

                    Status = new Status

                    {

                        Progress = 100,

                        JobOutput = new JToken []

                        {

                            JObject.FromObject(new { Count = 0 }),

                            JArray.FromObject(new [] { new { Count = 0 }}),

                            JValue.CreateNull(),

                            new JValue(new DateTime(2020, 4, 2, 16, 10, 10, DateTimeKind.Utc)),

                            new JValue("hello"),

                            new JValue(1.0101m),

                            new JRaw(@"[[{""aa"":""bb""}]]"),

                        },

                    },

                },

            };

            var settings = new JsonSerializerSettings

            {

                Converters = 

                {

                    new ForeignJsonNetContainerConverter(), new ForeignJsonNetValueConverter()

                },

            };

            var json = JsonConvert.SerializeObject(summary, Formatting.Indented, settings);

            Console.WriteLine(json);

        }   

    }

​

    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;

            }

        }

    }

​