using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Dynamic;

​

using System.Text.Json;

using System.Text.Json.Serialization;

​

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

​

//https://stackoverflow.com/questions/71695324/is-it-possible-to-deserialize-json-string-into-dynamic-object-using-system-text

    class TestClass

    {

        public static void Test()

        {

            var jsonString = "{\"foo\": \"bar\"}";

            dynamic data = JsonSerializer.Deserialize<ExpandoObject>(jsonString);

            Console.WriteLine(data.GetType());

            Console.WriteLine($"data.foo={data.foo}, data.foo.GetType()={data.foo.GetType()}");         

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

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

            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;

            }

        }

    }

​