using System;

​

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

            TestParent classeSerialize = new();

            ClasseEnfant maClasseEnfant = new()

            {

                Teste = "OK",

            };

            classeSerialize.ClasseAbstraite = maClasseEnfant;

​

            string result = JsonConvert.SerializeObject(classeSerialize, Formatting.Indented);

            Console.WriteLine(result);

            Console.WriteLine();

​

            JsonSerializerSettings settings = new()

            {

                TypeNameHandling = TypeNameHandling.All,

            };

            result = JsonConvert.SerializeObject(classeSerialize, Formatting.Indented, settings);

            Console.WriteLine("Avec Type :");

            Console.WriteLine(result);

            Console.ReadLine();

    }

​

    public class TestParent

    {

        public ClasseAbstract ClasseAbstraite { get; set; }

    }

​

    public abstract class ClasseAbstract

    {

        public abstract string Teste { get; set; }

    }

​

    public class ClasseEnfant : ClasseAbstract

    {

        private string field;

        public override string Teste

        {

            get { return field; }

            set { field = value; }

        }

        public bool OkOuPas

        {

            get { return true; }

        }

    }

}