using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Threading.Tasks;

using System.Net.Http;

​

using System.Text.Json;

using System.Text.Json.Serialization;

​

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

​

//https://stackoverflow.com/questions/72015973/system-text-json-in-refit-cant-handle-null-response-from-api

​

    public class MyClass

    {

    }

​

    public class Program

    {

        public static async Task Test()

        {

            var json = "";

            var myClassFromNewtonsoft = Newtonsoft.Json.JsonConvert.DeserializeObject<MyClass>(json);

            Console.WriteLine($"Successfully deserialized JSON {json} into {typeof(MyClass)} using Newtonsoft, value {(myClassFromNewtonsoft == null ? "is null" : " is {myClassFromNewtonsoft}")}.");

​

            var stream = new MemoryStream(Encoding.UTF8.GetBytes(json));

​

            var myClass = await JsonSerializer.DeserializeAsync<MyClass>(stream, new JsonSerializerOptions

                                            {

                                                PropertyNamingPolicy = JsonNamingPolicy.CamelCase

                                            });

            Console.WriteLine($"Successfully deserialized JSON {json} into {typeof(MyClass)} using System.Text.Json, value {(myClass == null ? "is null" : " is {myClass}")}.");

        }

        private static async Task<T> GetWithSystemTextJson<T>(string uri, HttpClient httpClient)

        {

            using var httpResponse = await httpClient.GetAsync(uri, HttpCompletionOption.ResponseHeadersRead);

​

            httpResponse.EnsureSuccessStatusCode(); 

​

            var stream = await httpResponse.Content.ReadAsStreamAsync();

            return await System.Text.Json.JsonSerializer.DeserializeAsync<T>(stream, 

                                                                             new System.Text.Json.JsonSerializerOptions 

                                                                             { 

                                                                                 PropertyNameCaseInsensitive = true 

                                                                             });

        }

        public static async Task Main(string[] args)

        {

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

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

            Console.WriteLine();

​

            try

            {

                await Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​