using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

​

using System.Text.Json;

using System.Text.Json.Serialization;

​

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

​

//https://stackoverflow.com/questions/75260285/what-is-the-purpose-of-the-inputtype-parameter-of-jsonserializer-serialize

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    public class Base

    {

        public string BaseProperty { get; set; }

    }

​

    public class Derived : Base

    {

        public string DerivedProperty { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

​

            Console.WriteLine("Serializing with typeof(Base):");

​

            var value = new Derived { BaseProperty = "hello", DerivedProperty = "there" };

            var json = JsonSerializer.Serialize(value, typeof(Base));

            Console.WriteLine(json);

​

            Console.WriteLine("\nSerializing with typeof(Derived):");

            Console.WriteLine(JsonSerializer.Serialize(value, typeof(Derived)));

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            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;

            }

        }

    }

​