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.Collections.ObjectModel;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using System.Text.Json;

​

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

​

//https://stackoverflow.com/questions/62033264/why-does-system-text-json-serialiser-not-serialise-this-generic-property-but-jso

​

public class A

{

    public string AProperty { get; set; } = "A";

}

​

public class A<T> : A where T : class, new()

{

    public T TObject { get; set; } = new T();

}

​

public class B

{

    public string BProperty { get; set; } = "B";

}

​

public class B<T> : B where T : class, new()

{

    public T TObject { get; set; } = new T();

}

​

public class C

{

    public string CProperty { get; set; } = "C";

}

​

    class TestClass

    {

        public static void Test()

        {

            var obj = new A<B<C>> { TObject = new B<C>() };

​

            //The following won't compile

            //'JsonSerializer' is an ambiguous reference between 'Newtonsoft.Json.JsonSerializer' and 'System.Text.Json.JsonSerializer'

            //var systemTextSerialized = JsonSerializer.Serialize(obj);

            var systemTextSerialized = System.Text.Json.JsonSerializer.Serialize(obj);

            var newtonsoftSerialized = JsonConvert.SerializeObject(obj);

            Console.WriteLine(systemTextSerialized);

            Console.WriteLine(newtonsoftSerialized);

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());

            Console.WriteLine("{0} version: {1}", typeof(Newtonsoft.Json.JsonSerializer).Assembly.GetName().Name,  typeof(Newtonsoft.Json.JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;

            var assemblyPath = assembly.CodeBase.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

            int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");

            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)

                return assemblyPath[netCoreAppIndex + 1];

            return null;

        }

    }

​