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.Buffers;

​

using System.Text.Json;

using System.Text.Json.Serialization;

​

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

​

//https://stackoverflow.com/questions/62996999/convert-object-to-system-text-json-jsonelement

//https://stackoverflow.com/questions/58138793/system-text-json-jsonelement-toobject-workaround

​

    public static partial class JsonExtensions

    {

        public static JsonDocument JsonDocumentFromObject<TValue>(TValue value, JsonSerializerOptions options = default) 

            => JsonDocumentFromObject(value, typeof(TValue), options);

​

        public static JsonDocument JsonDocumentFromObject(object value, Type type, JsonSerializerOptions options = default)

        {

            var bytes = JsonSerializer.SerializeToUtf8Bytes(value, type, options);

            return JsonDocument.Parse(bytes);

        }

​

        public static JsonElement JsonElementFromObject<TValue>(TValue value, JsonSerializerOptions options = default)

            => JsonElementFromObject(value, typeof(TValue), options);

​

        public static JsonElement JsonElementFromObject(object value, Type type, JsonSerializerOptions options = default)

        {

            using var doc = JsonDocumentFromObject(value, type, options);

            return doc.RootElement.Clone();

        }

    }

​

    public class MyClass

    {

        public string Data { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            using var doc = JsonExtensions.JsonDocumentFromObject(new MyClass { Data = "value" });

            Console.WriteLine(doc.RootElement);

            var element = JsonExtensions.JsonElementFromObject(new MyClass { Data = "value" });

            Console.WriteLine(element);

        }   

    }

​

    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;

        }

    }

​