using System;

using JsonSubTypes;

using Newtonsoft.Json;

​

        [JsonConverter(typeof(JsonSubtypes))]

        [JsonSubtypes.KnownSubTypeWithProperty(typeof(Example123), "123Configuration")]

        public abstract class ExampleBase

        {

        }

​

        public class Example123: ExampleBase

        {

            [JsonProperty("123Configuration", Required = Required.Always)]

            public Example123Config Configuration123{ get; set; }

        }

​

        public class Example123Config

        {

            public string Id { get; set; }

            public string Name { get; set; }

        }

​

public class Program

{

    public static void Main()

    {

            var root = JsonConvert.DeserializeObject<ExampleBase>("{\"123Configuration\": {\n\"Id\": \"1\",\n\"Name\": \"NameValue\"}}");

            Console.WriteLine(root.GetType());

    }

}