using System;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            {

              ""StatusMessage"": [

                ""Record processed successfully""

              ],

              ""StatCode"": [

                ""200""

              ],

              ""MSCaseNumber"": [

                ""500""

              ],

              ""MSAccountNumber"": [

                ""001""

              ]

            }";

​

        var dto = JsonConvert.DeserializeObject<ResultDTO>(json, new StringArrayToStringConverter());

        Console.WriteLine($"StatCode: {dto.StatCode}");

        Console.WriteLine($"StatusMessage: {dto.StatusMessage}");

        Console.WriteLine($"MSCaseNumber: {dto.MSCaseNumber}");

        Console.WriteLine($"MSAccountNumber: {dto.MSAccountNumber}");

    }

}

​

public class ResultDTO

{

    public string MSAccountNumber { get; set; }

    public string MSCaseNumber { get; set; }

    public string StatusMessage { get; set; }

    public string StatCode { get; set; }

}

​

class StringArrayToStringConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return objectType == typeof(string);

    }

​

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

    {

        if (reader.TokenType == JsonToken.Null) return null;

        if (reader.TokenType == JsonToken.String) return (string)reader.Value;

        if (reader.TokenType == JsonToken.StartArray)

        {

            JArray array = JArray.Load(reader);

            string value = (string)array.Children<JValue>().FirstOrDefault();

            return value;

        }

        throw new JsonException("Unexpected token type: " + reader.TokenType);

    }

​

    public override bool CanWrite => false;

​

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        throw new NotImplementedException();

    }

}

​