using System;

using System.Collections.Generic;

using System.Dynamic;

using System.Text.Json;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        //ExpandoObject p = JsonConvert.DeserializeObject<ExpandoObject>(@"{""obj"":3}");

        ExpandoObject p = System.Text.Json.JsonSerializer.Deserialize<ExpandoObject>(@"{""obj"":3}");

        foreach (KeyValuePair<string, object> item in p)

        {

            Console.WriteLine(item);

        }

    }

}