using System;

using Newtonsoft.Json;

using System.Collections.Generic;

​

​

​

public class Program

{

    public static void Main()

    {

        string json = @"{

                          ""user_id"": ""something_name"",

                          ""devices"": {

                            """": {

                              ""sessions"": [

                                {

                                  ""connections"": [

                                    {

                                      ""ip"": ""225.225.225.225"",

                                      ""user_agent"": ""something"",

                                      ""last_seen"": 1504266816737

                                    }

                                  ]

                                }

                              ]

                            }

                          }

                        }";

​

​

        Console.WriteLine("Deserializing json...");

        RootObject o = JsonConvert.DeserializeObject<RootObject>(json, new JsonSerializerSettings

        {

            MissingMemberHandling = MissingMemberHandling.Ignore, 

            NullValueHandling = NullValueHandling.Ignore //these settings are not important here

        });

        Console.WriteLine("Success!");

        foreach (var dev in o.devices)

        {

            Console.WriteLine("  Device Key   #: {0}", dev.Key);

            Console.WriteLine("  Device Value #: {0}", dev.Value);

            Console.WriteLine("            IP #: {0}", dev.Value.sessions[0].connections[0].ip);

        }

    }

}

​

public class RootObject

{public string user_id { get; set; }

    public Dictionary<string, Devices> devices { get; set; }

}

public class Devices

{

    public List<Session> sessions { get; set; }

}

public class Session

{

    public List<Connections> connections { get; set; }

}

public class Connections

{

    public string ip { get; set; }

    public string user_agent { get; set; }

    public long last_seen { get; set; }

}