using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            [

                {

                    ""id"": ""OUHDm"",

                    ""title"": ""My most recent drawing. Spent over 100 hours."",

                    ""link"": ""http://i.imgur.com/OUHDm.jpg"",

                    ""is_album"": false

                },

                {

                    ""id"": ""lDRB2"",

                    ""title"": ""Imgur Office"",

                    ""link"": ""http://alanbox.imgur.com/a/lDRB2"",

                    ""is_album"": true,

                    ""images_count"": 3,

                    ""images"": [

                        {

                            ""id"": ""24nLu"",

                            ""link"": ""http://i.imgur.com/24nLu.jpg""

                        },

                        {

                            ""id"": ""Ziz25"",

                            ""link"": ""http://i.imgur.com/Ziz25.jpg""

                        },

                        {

                            ""id"": ""9tzW6"",

                            ""link"": ""http://i.imgur.com/9tzW6.jpg""

                        }

                    ]

                }

            ]";

​

        List<GalleryItem> items = JsonConvert.DeserializeObject<List<GalleryItem>>(json, new GalleryItemConverter());

​

        foreach (GalleryItem item in items)

        {

            Console.WriteLine("id: " + item.id);

            Console.WriteLine("title: " + item.title);

            Console.WriteLine("link: " + item.link);

            if (item.is_album)

            {

                GalleryAlbum album = (GalleryAlbum)item;

                Console.WriteLine("album images (" + album.images_count + "):");

                foreach (GalleryImage image in album.images)

                {

                    Console.WriteLine("    id: " + image.id);

                    Console.WriteLine("    link: " + image.link);

                }

            }

            Console.WriteLine();

        }

    }

}

​

public class GalleryItemConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return typeof(GalleryItem).IsAssignableFrom(objectType);

    }

​

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

    {

        JObject jo = JObject.Load(reader);

​

        // Using a nullable bool here in case "is_album" is not present on an item

        bool? isAlbum = (bool?)jo["is_album"];

​

        GalleryItem item;

        if (isAlbum.GetValueOrDefault())

        {

            item = new GalleryAlbum();

        }

        else

        {

            item = new GalleryImage();

        }

​

        serializer.Populate(jo.CreateReader(), item);

​

        return item;

    }

​

    public override bool CanWrite

    {

        get { return false; }

    }

​

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

    {

        throw new NotImplementedException();

    }

}

​

//[JsonConverter(typeof(GalleryItemConverter))]

public abstract class GalleryItem

{

    public string id { get; set; }

    public string title { get; set; }

    public string link { get; set; }

    public bool is_album { get; set; }

}

​

public class GalleryImage : GalleryItem

{

    // ...

}

​

public class GalleryAlbum : GalleryItem

{

    public int images_count { get; set; }

    public List<GalleryImage> images { get; set; }

}

​