Converting Windows Phone to Windows 8: Listing 1

The WebClient class, which downloads the XML feed as a string.

public class MainPageViewModel
{
    public ObservableCollection<FlickrImage> FlickrImages { get; private set; }

    public MainPageViewModel()
    {
        FlickrImages = new ObservableCollection<FlickrImage>();
    }

    public void Load()
    {

        var wc = new WebClient();
        wc.DownloadStringCompleted += DownloadFlickrCompleted;
        wc.DownloadStringAsync(new Uri("http://api.flickr.com/services/feeds/photos_public.gne?format=xml&tags=wp7"));
    }

    private void DownloadFlickrCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        if (e.Error == null)
        {
            var xml = XElement.Parse(e.Result);

            var ns = XNamespace.Get("http://www.w3.org/2005/Atom");


            var images = (from entry in xml.Descendants(ns.GetName("entry"))
                            let title = entry.Element(ns.GetName("title"))

                            from links in entry.Descendants(ns.GetName("link"))
                            let rel=links.Attribute("rel")
                            where rel.Value == "enclosure"

                            let href = links.Attribute("href")
                            select new FlickrImage
                                        {
                                            ImageUrl = href.Value,
                                            Title = title.Value
                                        }).ToArray();

            foreach (var img in images)
            {
                FlickrImages.Add(img);
            }
        }
    }

    public class FlickrImage
    {
        public string ImageUrl { get; set; }
        public string Title { get; set; }
    }
}

About the Author

Nick Randolph runs Built to Roam, a consulting company that specializes in training, mentoring and assisting other companies build mobile applications. With a heritage in rich client applications for both the desktop and a variety of mobile platforms, Nick currently presents, writes and educates on the Windows Phone platform.

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