//Hacking asynchronous file IO just to make the interface consistent - there's not much performance benefit otheriwse
public override IAsyncResult BeginDownloadXml(Uri feeduri, AsyncCallback callback)
{
if (!this.PingFeed(feeduri))
{
throw new MissingFeedException(string.Format("Was unable to open local XML file {0}", feeduri.LocalPath));
}
return(FeedWorkerDelegate.BeginInvoke(feeduri, callback, new FeedTuple()));
}
