using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json1 = @"{

            'field1': 'A',

            'specifications': {

                'customfield_24020': 'HFE1'

            }

        }";

​

        DeserializeAndDump(json1);

​

        string json2 = @"{

            'field1': 'B',

            'specifications': {

                'customfield_21007': 'HFE2'

            }

        }";

​

        DeserializeAndDump(json2);

        string json3 = @"{

            'field1': 'C',

            'specifications': {

                'customfield_24020': 'HFE1111',

                'customfield_21007': 'HFE2222'

            }

        }";

​

        DeserializeAndDump(json3);

    }

    private static void DeserializeAndDump(string json)

    {

        var obj = JsonConvert.DeserializeObject<ClassToDeserialize>(json);

        Console.WriteLine("Vin: " + obj.Vin);

        Console.WriteLine("Specifications: " + obj.Specifications.CurrentStep);

        Console.WriteLine();

    }

}

​

​

public class Specifications

{

    [JsonProperty("customfield_24020")]

    public string CurrentStep { get; set; }

​

    [JsonProperty("customfield_21007")]

    private string CurrentStep2 { set { CurrentStep = value; } }

}

​

public class ClassToDeserialize

{

    [JsonProperty("field1")]

    public string Vin { get; set; }

​

    [JsonProperty("specifications")]

    public Specifications Specifications { get; set; }        

}