Question

 var image = new BitmapImage();
     image.ImageFailed += (s, e) => {
       // ...
     };
     image.UriSource = new Uri("someurl", UriKind.Absolute);

In the documentation it’s mentioned that the ImageFailed event can be raised by:

• File not found.
• Invalid (unrecognized or unsupported) file format.
• Unknown file format decoding error after upload

Is it possible to detect which one of these conditions caused it inside the event?

Answer 1

Yes, since the event argument is a ExceptionRoutedEventArgs which have a ErrorException property, in which you can check for following exception types:

• SecurityException
• FileNotFoundException
• NotSupportedException
• COMException

Read the details on MSDN

Example:

var image = new BitmapImage();
image.ImageFailed += (s, e) => 
{
    if (e.ErrorException is FileNotFoundException)
         // File not found.
    else if (e.ErrorException is NotSupportedException)
        // Unknown file format decoding error after upload
    else
        // Really bad stuff happened!    
};