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 System.Text.Json;

using System.Text.Json.Serialization;

​

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

​

//https://stackoverflow.com/questions/59581708/system-text-json-serialization-against-an-anonymous-object

​

    public interface IMyInterface

    {

        //string Foo { get; set; }

    }

​

    public class ClassBase : IMyInterface

    {

        public string Foo { get; set; }

    }

​

    public class Class1 : ClassBase

    {

        public string Bar1 { get; set; }

    }

​

    public class Class2 : ClassBase

    {

        public string Bar2 { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var items = new List<object>() { new Class1 { Foo = "foo1", Bar1 = "Bar1" }, new Class2 { Foo = "foo1", Bar2 = "Bar2" } };

            int totalCount = 1;

            int min = 2;

            int max = 3;

​

            var root = new

            {

                totalCount,

                min,

                max,

                items,

            };

            var json = JsonSerializer.Serialize<object>(root, new JsonSerializerOptions { WriteIndented = true,  });

            Console.WriteLine(json);

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

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

            Console.WriteLine("System.Text.Json version: " + typeof(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;

        }

    }

​