Tim Van Wassenhove

Virtually every Silverlight application will fetch resources at one point or another. In case you’re using the WebClient you have probably written the following in your xxxCompletedEventHandler:

if (e.Error != null && !e.Cancelled)
{
 // do something with the result
}

Anyway, i don’t like repetition so i captured the conditions in a method:

public static class ExtensionMethods
{
 public static bool HasResult(this AsyncCompletedEventArgs e)
 {
  if (e.Error != null) return false;
  if (e.Cancelled) return false;
  return true;
 }
}

And now we can write our code as:

if (e.HasResult())
{
 // do something with the result
}

Apart from saving a couple of keystrokes this also allows us to easily add another condition to determine the success of the operation.