async Task <SyndicationFeed> ReadFromWebWithAlternative()
{
// including user agent, otherwise FB rejects the request
var _Client = new HttpClient();
var _UserAgent = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)";
_Client.DefaultRequestHeaders.Add("user-agent", _UserAgent);
// fetch as string to avoid error
var _Uri = new Uri(this.SourceUrl);
var _Response = await _Client.GetAsync(_Uri);
var _String = await _Response.Content.ReadAsStringAsync();
// convert to xml (will validate, too)
var _XmlDocument = new Windows.Data.Xml.Dom.XmlDocument();
_XmlDocument.LoadXml(_String);
// manually fill feed from xml
var _Feed = new Windows.Web.Syndication.SyndicationFeed();
_Feed.LoadFromXml(_XmlDocument);
return(_Feed);
}
public async void Run(IBackgroundTaskInstance taskInstance)
{
Logger.Log("Starting task");
//it is an async work that could take long, we need to get a deferral...
var deferral = taskInstance.GetDeferral();
try
{
CachedFileController fileController = new CachedFileController();
fileController.NotifyMessage += (o,message) =>
{
ShowNotificationBadge(message);
};
var asyncDownload= fileController.DownloadFileAsync();
asyncDownload.Progress = (o, p) =>
{
taskInstance.Progress = (uint)(p.BytesReceived * 100 / (p.TotalBytesToReceive ?? (50 * 1024)));
};
await asyncDownload;
//now count feed posts
var file = await fileController.GetFileAsync();
XmlDocument doc = new XmlDocument();
doc.LoadXml(file);
SyndicationFeed feed = new SyndicationFeed();
feed.LoadFromXml(doc);
ShowNotificationBadge(feed.Items.Count);
}
catch (Exception ex)
{
Logger.Log("Download File Exception: {0}", ex.Message);
ShowNotificationBadge("error");
ShowNotificationBadge(0);
}
finally
{
Logger.Log("End Task");
deferral.Complete();
}
}
/// <summary>
/// The timer callback for periodic updates
/// </summary>
/// <param name="state">A reference to the IoC <see cref="Container"/></param>
private async void Callback(object state)
{
var container = state as Container;
if (container == null)
{
return;
}
var viewModel = container.ResolveNamed<NewsViewModel>(NewsViewModel.Name);
if (viewModel == null)
{
return;
}
var url = string.Empty;
lock (m_Lock)
{
url = string.Format("http://www.reddit.com/r/{0}/new/.rss", m_Subreddit);
}
var feed = new SyndicationFeed();
var client = new HttpClient();
var rssString = await client.GetStringAsync(url);
var xmlDocument = new XmlDocument();
xmlDocument.LoadXml(rssString);
feed.LoadFromXml(xmlDocument);
DispatcherHelper.RunOnUIThread(() =>
{
viewModel.FeedItems = feed.Items;
});
}
