Hi,I'm reading an rss feed every 10th second, but on some occations I receive a Unexpexted end of file, although I'm 100% certain that the rss is valid. I'm using the sample code for ArcGIS API for WPF 2.4. Does anyone have an idea of what the problem is, and how I can resolve it? The code is included below:
private void Fetch_Click(object sender, RoutedEventArgs e)
{
if (FeedLocationTextBox.Text != String.Empty)
{
LoadRSS(FeedLocationTextBox.Text.Trim());
DispatcherTimer UpdateTimer = new System.Windows.Threading.DispatcherTimer();
UpdateTimer.Interval = new TimeSpan(0, 0, 0, 0, 60000);
UpdateTimer.Tick += (evtsender, args) =>
{
LoadRSS(FeedLocationTextBox.Text.Trim());
};
UpdateTimer.Start();
}
}
protected void LoadRSS(string uri)
{
WebClient wc = new WebClient();
wc.OpenReadCompleted += wc_OpenReadCompleted;
Uri feedUri = new Uri(uri, UriKind.Absolute);
wc.OpenReadAsync(feedUri);
}
private void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error != null)
{
FeedLocationTextBox.Text = "Error in Reading Feed. Try Again later!!";
return;
}
// Optional, use LINQ to query GeoRSS feed.
//UseLinq(e.Result); return;
using (Stream s = e.Result)
{
SyndicationFeed feed;
List<SyndicationItem> feedItems = new List<SyndicationItem>();
GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
graphicsLayer.ClearGraphics();
using (XmlReader reader = XmlReader.Create(s))
{
feed = SyndicationFeed.Load(reader);
foreach (SyndicationItem feedItem in feed.Items)
{
SyndicationElementExtensionCollection ec = feedItem.ElementExtensions;
string x = "";
string y = "";
string magnitude = feedItem.Title.Text;
foreach (SyndicationElementExtension ee in ec)
{
XmlReader xr = ee.GetReader();
switch (ee.OuterName)
{
case ("lat"):
{
y = xr.ReadElementContentAsString();
break;
}
case ("long"):
{
x = xr.ReadElementContentAsString();
break;
}
}
}
if (!string.IsNullOrEmpty(x))
{
Graphic graphic = new Graphic()
{
Geometry = new MapPoint(Convert.ToDouble(x, System.Globalization.CultureInfo.InvariantCulture),
Convert.ToDouble(y, System.Globalization.CultureInfo.InvariantCulture),
new SpatialReference(4326)),
Symbol = LayoutRoot.Resources["QuakePictureSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol
};
graphic.Attributes.Add("MAGNITUDE", magnitude);
graphicsLayer.Graphics.Add(graphic);
}
}
}
Thanks.
