using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.IO;

​

namespace testapp

{

    class Program

    {

        static void Main(string[] args)

        {

           string json = @"

            {

                ""ID"": {

                    ""type"": ""integer"",

                    ""title"": ""ID Display Name""

                },

                ""TITLE"": {

                    ""type"": ""string"",

                    ""title"": ""Title Display name""

                },

                ""NAME"": {

                    ""type"": ""string"",

                    ""title"": ""Name""

                },

                ""CUSTOM_123"": {

                    ""type"": ""string"",

                    ""title"": ""CUSTOM_123"",

                    ""formLabel"": ""CUSTOM_123 Display Name""

                }

            }";

            List<Field> result = JsonConvert.DeserializeObject<List<Field>>(json, new JobInfoConverter());

            Console.WriteLine(result.Count);

        }

​

​

​

        public class Field

        {

            public string title { get; set; }

            public string type { get; set; }

        }

​

        public class JobInfoConverter : JsonConverter

        {

            public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

            {

                try

                {

                    List<Field> result = new List<Field>();

                    var content = JObject.Load(reader);

                    foreach (var prop in content.Properties())

                    {

                        var parsedValue = prop.Value.ToObject<Field>();

                        if (prop.Name.StartsWith("CUSTOM_"))

                        {

                            parsedValue.title = prop.Value["formLabel"].ToString();

                        }

                        result.Add(parsedValue);

​

                    }

                    return result;

                }

                catch (Exception ex)

                {

                    return null;

                }

            }

​

            public override void WriteJson(JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer) => throw new NotImplementedException();

​

            public override bool CanConvert(Type objectType)

            {

                return true;

            }

​

            public override bool CanWrite => true;

​

        }

    }

}

​