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/70895894/persist-formatting-of-original-document-with-jsondocument

​

    class TestClass

    {

        public static void Test()

        {

            var json1 = GetJson();

            using var jdoc = JsonDocument.Parse(json1);

            var json2 = jdoc.RootElement.GetRawText();

            Console.WriteLine("JSON generated using JsonElement.GetRawText():");

            Console.WriteLine(json2);

            Assert.AreEqual(json1, json2);

            using (var stream = new MemoryStream())

            {

                var writer = new Utf8JsonWriter(stream);

                jdoc.WriteTo(writer);

                writer.Flush();

                var json3 = Encoding.UTF8.GetString(stream.GetBuffer(), 0, checked((int)stream.Length));

                Console.WriteLine("JSON generated using Utf8JsonWriter:");

                Console.WriteLine(json3);

            }           

        }   

        static string GetJson() => @"{

    ""glossary"": {

        ""title"":                ""example glossary"",

""title"": ""example glossary"",

                ""GlossDiv"": {

""title"":""S"",

            ""GlossList"": {

                ""GlossEntry"": {

                    ""ID"": ""SGML"",

                        ""SortAs"": ""SGML"",

                    ""GlossTerm"": ""Standard Generalized Markup Language"",

                    ""Acronym"": ""SGML"",

                                 ""Abbrev"": ""ISO 8879:1986"",

                    ""GlossDef"": {

   ""para"": ""A meta-markup language, used to create markup languages such as DocBook."",

                        ""GlossSeeAlso"": [""GML"", ""XML""]

                    },

""GlossSee"":                          ""markup""

                }

            }

        }

    }

}";

    }

​

    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.Location.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

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

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

                return assemblyPath[netCoreAppIndex + 1];

            return "";

        }

    }

​