using Newtonsoft.Json;  

​

public class Program

{

    public static void Main()

    {

        JsonConvert.DeserializeObject<Code>("{\"id\": \"aa\"}");

    }

}

​

public class Code

{

    [JsonProperty("id", Required = Required.Always)]

    public string id { get; set; }

​

    [JsonProperty("type", Required = Required.Always)]

    public string type { get; set; }

}