使用c#反序列化json数据以获得图像

我在wikipediaapi上请求获得3个图像url，这样我就可以在代码中使用这张图片。我使用urlhttps://en.wikipedia.org/w/api.php?action=query&prop=imageinfo&format=json&iiprop=url&iiurlwidth＝400&title=文件%3Luftbild%20Flensburg%20Schleswig-Holstein%20Zentrum%20Stadthafen%20Foto%202012%20Wolfgang%20Pehlemann%20Steinberg Ostsee%20IMG%206187.jpg%7文件%3Hafen%20St%20Marien%20Flesburg2007.jpg文件%3Nordertor%20im%20Schnee%20（Flensburg%2C%20Januar%202014）。jpg获取三张图像。我从json2csharp得到了以下json文件。

         public class Imageinfo
         {
            public string thumburl { get; set; }
            public int thumbwidth { get; set; }
            public int thumbheight { get; set; }
            public string url { get; set; }
            public string descriptionurl { get; set; }
        }
         public class Pageval1
         {
            public int ns { get; set; }
            public string title { get; set; }
            public string missing { get; set; }
            public string imagerepository { get; set; }
            public List<Imageinfo> imageinfo { get; set; }
         }
        public class Imageinfo2
        {
            public string thumburl { get; set; }
            public int thumbwidth { get; set; }
            public int thumbheight { get; set; }
            public string url { get; set; }
            public string descriptionurl { get; set; }
        }
        public class Pageval2
        {
            public int ns { get; set; }
            public string title { get; set; }
            public string missing { get; set; }
            public string imagerepository { get; set; }
            public List<Imageinfo2> imageinfo { get; set; }
        }
        public class Imageinfo3
        {
            public string thumburl { get; set; }
            public int thumbwidth { get; set; }
            public int thumbheight { get; set; }
            public string url { get; set; }
            public string descriptionurl { get; set; }
        }
        public class Pageval3
        {
            public int ns { get; set; }
            public string title { get; set; }
            public string missing { get; set; }
            public string imagerepository { get; set; }
            public List<Imageinfo3> imageinfo { get; set; }
        }
        public class Pages
    {
        public List<Pageval1> pageval1 { get; set; }
        public List<Pageval2> pageval2 { get; set; }
        public List<Pageval3> pageval3 { get; set; }
    }

 class Image
 {
    public static PictureBox Image1 = new PictureBox();
    public static PictureBox Image2 = new PictureBox();
    public static PictureBox Image3 = new PictureBox();
    public static void Load_Image1()
    {
      using (WebClient wc = new WebClient())
      {
        var client = new WebClient();
        var uri = ("https://en.wikipedia.org/w/api.php?action=query&prop=imageinfo&format=json&iiprop=url&iiurlwidth=400&titles=File%3ALuftbild%20Flensburg%20Schleswig-Holstein%20Zentrum%20Stadthafen%20Foto%202012%20Wolfgang%20Pehlemann%20Steinberg-Ostsee%20IMG%206187.jpg%7CFile%3AHafen%20St%20Marien%20Flensburg2007.jpg%7CFile%3ANordertor%20im%20Schnee%20(Flensburg%2C%20Januar%202014).JPG");
        var response = client.DownloadString(new Uri(uri));
        var responseJson = JsonConvert.DeserializeObject<RootObject>(response);
        var firstKey1 = responseJson.query.pages.First().Key;
        string image1 = responseJson.query.pages[firstKey1].pageval1.First().imageinfo.First().thumburl;
        String image2 = responseJson.query.pages[firstKey1].pageval2.First().imageinfo.First().thumburl;
        String image3 = responseJson.query.pages[firstKey1].pageval3.First().imageinfo.First().thumburl;
        Image1.SizeMode = PictureBoxSizeMode.StretchImage;
        Image2.SizeMode = PictureBoxSizeMode.StretchImage;
        Image3.SizeMode = PictureBoxSizeMode.StretchImage;
        Image1.LoadAsync(image1);
        Image2.LoadAsync(image2);
        Image3.LoadAsync(image3);


      }
   }
  }

 }

我想从每个图片信息中获取缩略图。但我不知道如何继续使用这些类来序列化json，然后获得图像。