Listing1: Page Navigation with Windows Phone and Windows 8

Repository class with Load method to retrieve FlickrImages.

public class Repository
{
    private FlickrImage[] Images { get; set; }

    public async Task<IEnumerable<FlickrImage>> Load()
    {
        if (Images != null) return Images;

        var request = HttpWebRequest.CreateHttp("http://api.flickr.com/services/feeds/photos_public.gne?format=xml&t
ags=wp7");
#if WINDOWS_PHONE
        request.AllowReadStreamBuffering = true;
#endif
        var resp = await request.GetResponseAsync();

        using (var strm = resp.GetResponseStream())
        {
            var xml = XElement.Load(strm);

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


            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();

            return Images;
        }
    }
}

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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