static public bool HandleException(Exception exception, TextBox outputField, MainPage rootPage)
{
SyndicationErrorStatus status = SyndicationError.GetStatus(exception.HResult);
if (status != SyndicationErrorStatus.Unknown)
{
outputField.Text += "The response content is not valid. " +
"Please make sure to use a URI that points to an Atom feed.\r\n";
}
else
{
WebErrorStatus webError = WebError.GetStatus(exception.HResult);
if (webError == WebErrorStatus.Unauthorized)
{
outputField.Text += "Incorrect username or password.\r\n";
}
else if (webError == WebErrorStatus.Unknown)
{
// Neither a syndication nor a web error.
return(false);
}
}
rootPage.NotifyUser(exception.Message, NotifyType.ErrorMessage);
return(true);
}
public async static Task <string> GetFeedTitleAsync()
{
string response = String.Empty;
SyndicationFeed feed = new SyndicationFeed();
SyndicationClient client = new SyndicationClient();
try
{
feed = await client.RetrieveFeedAsync(
new Uri("http://www.apress.com/index.php/dailydeals/index/rss"));
response = feed.GetXmlDocument(SyndicationFormat.Rss20).GetXml();
}
catch (Exception ex)
{
SyndicationErrorStatus status = SyndicationError.GetStatus(ex.HResult);
if (status == SyndicationErrorStatus.InvalidXml)
{
response += "Invalid XML!";
}
if (status == SyndicationErrorStatus.Unknown)
{
response = ex.Message;
}
}
return(response);
}
private async void GetFeed_Click(object sender, RoutedEventArgs e)
{
outputField.Text = "";
// By default 'FeedUri' is disabled and URI validation is not required. When enabling the text box
// validating the URI is required since it was received from an untrusted source (user input).
// The URI is validated by calling Uri.TryCreate() that will return 'false' for strings that are not valid URIs.
// Note that when enabling the text box users may provide URIs to machines on the intrAnet that require
// the "Home or Work Networking" capability.
Uri uri;
if (!Uri.TryCreate(FeedUri.Text.Trim(), UriKind.Absolute, out uri))
{
rootPage.NotifyUser("Error: Invalid URI.", NotifyType.ErrorMessage);
return;
}
SyndicationClient client = new SyndicationClient();
client.BypassCacheOnRetrieve = true;
// Although most HTTP servers do not require User-Agent header, others will reject the request or return
// a different response if this header is missing. Use SetRequestHeader() to add custom headers.
client.SetRequestHeader("User-Agent", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)");
rootPage.NotifyUser("Downloading feed...", NotifyType.StatusMessage);
outputField.Text = "Downloading feed: " + uri.ToString() + "\r\n";
try
{
currentFeed = await client.RetrieveFeedAsync(uri);
rootPage.NotifyUser("Feed download complete.", NotifyType.StatusMessage);
DisplayFeed();
}
catch (Exception ex)
{
SyndicationErrorStatus status = SyndicationError.GetStatus(ex.HResult);
if (status == SyndicationErrorStatus.InvalidXml)
{
outputField.Text += "An invalid XML exception was thrown. " +
"Please make sure to use a URI that points to a RSS or Atom feed.";
}
if (status == SyndicationErrorStatus.Unknown)
{
WebErrorStatus webError = WebError.GetStatus(ex.HResult);
if (webError == WebErrorStatus.Unknown)
{
// Neither a syndication nor a web error. Rethrow.
throw;
}
}
rootPage.NotifyUser(ex.Message, NotifyType.ErrorMessage);
}
}
public async Task InitializePlaybackList()
{
// string uri = "https://channel9.msdn.com/Feeds/RSS"; //"http://www.xamarinpodcast.com/rss";
string uri = "http://www.xamarinpodcast.com/rss";
Uri _feedUri;
if (!Uri.TryCreate(uri, UriKind.Absolute, out _feedUri))
{
return;
}
var client = new SyndicationClient {
BypassCacheOnRetrieve = true
};
try
{
var _currentFeed = await client.RetrieveFeedAsync(_feedUri);
var title = _currentFeed.Title;
foreach (var item in _currentFeed.Items)
{
// Display title.
var displayTitle = item.Title?.Text ?? "(no title)";
if (item.Links.Count > 1)
{
var linkUri = item.Links[1].Uri;
var artUriString = item.ElementExtensions.FirstOrDefault(e => e.NodeName == "image")?.AttributeExtensions.FirstOrDefault(a => a.Name == "href")?.Value;
if (string.IsNullOrEmpty(artUriString))
{
artUriString = item.ElementExtensions.LastOrDefault(e => e.NodeName == "thumbnail")?.AttributeExtensions.FirstOrDefault(a => a.Name == "url")?.Value;
}
Uri artUri = null;
if (artUriString != null)
{
artUri = new Uri(artUriString);
}
var media = new MediaModel(linkUri)
{
Title = displayTitle, ArtUri = artUri
};
playlistView.Items.Add(media);
playbackList.Items.Add(media.MediaPlaybackItem);
}
}
}
catch (Exception ex)
{
SyndicationErrorStatus status = SyndicationError.GetStatus(ex.HResult);
if (status == SyndicationErrorStatus.InvalidXml)
{
Debug.WriteLine("An invalid XML exception was thrown. " +
"Please make sure to use a URI that points to a RSS or Atom feed.");
}
if (status == SyndicationErrorStatus.Unknown)
{
WebErrorStatus webError = WebError.GetStatus(ex.HResult);
if (webError == WebErrorStatus.Unknown)
{
// Neither a syndication nor a web error. Rethrow.
throw;
}
}
Debug.WriteLine(ex.Message);
}
// Subscribe for changes
playbackList.CurrentItemChanged += PlaybackList_CurrentItemChanged;
// Loop
playbackList.AutoRepeatEnabled = true;
playlistView.SelectedIndex = -1;
}
