using System;

using System.Text.Json;

​

public class Program

{

    public static void Main()

    {

        // Problematic test case

        Console.WriteLine("Case 1: Derived class");

        try

        {

            var obj = JsonSerializer.Deserialize("{}", typeof(DerivedTestClass));

            Console.WriteLine("obj: " + obj.ToString());

        }

        catch (JsonException e)

        {

            // Is not been thrown

            Console.WriteLine(e.Message);

        }

​

        // Second test case for reference

        Console.WriteLine("\nCase 2: Base class");

        try

        {

            var obj = JsonSerializer.Deserialize("{}", typeof(TestClass));

            Console.WriteLine("obj: " + obj.ToString());

        }

        catch (JsonException e)

        {

            // Is thrown as expected

            Console.WriteLine(e.Message);

        }

    }

​

    private class TestClass

    {

        public required string StringValue { get; set; }

        public required int IntegerValue { get; set; }

    }

​

    private class DerivedTestClass : TestClass

    {

        public override string ToString()

        {

            return $"StringValue: '{StringValue}', IntegerValue: '{IntegerValue}'";

        }

    }

}