using System;

using System.Collections.Generic;

using System.Dynamic;

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

public class Program

{

    public static void Main()

    {

        var obj = new SomeClass{InterfaceMember = "xyz", X = 3 };

        string serializedData = JsonConvert.SerializeObject(obj);

        dynamic t = JsonConvert.DeserializeObject<SomeClass2>(serializedData);

        var X = t.X;

        Console.WriteLine("X: " + X);

    }

    public class SomeClass: ISomeInterface

    {

        public int X { get; set; }

        public string InterfaceMember { get; set; }

    }

​

    public interface ISomeInterface

    {

        string InterfaceMember { get; set; }

    }

​

    public class SomeClass2 : DynamicObject, ISomeInterface

    {

        private Dictionary<string, object> dictionary = new Dictionary<string, object>();

        public string InterfaceMember {get;set;}

​

        public override bool TryGetMember(GetMemberBinder binder, out object result)

        {

            return dictionary.TryGetValue(binder.Name, out result);

        }

​

        public override bool TrySetMember(SetMemberBinder binder, object value)

        {

            dictionary[binder.Name] = value;

            return true;

        }

    }

}