How can I tell if a WPF bitmap image has failed to load?

Question

I'm using the following code to load an image from file into a bitmap image class to display to the user at a particular size:

 BitmapImage resized = new BitmapImage(); FileStream fs = new FileStream(ImageSource, FileMode.Open); MemoryStream ms = new MemoryStream(); fs.CopyTo(ms); fs.Close(); resized.BeginInit(); resized.CacheOption = BitmapCacheOption.OnDemand; resized.DecodePixelHeight = (int)(_imageBaseHeight * zoomRate); resized.DecodePixelWidth = (int)(_imageBaseWidth * zoomRate); resized.StreamSource = ms; resized.EndInit(); ImageDisplay = resized;

The problem is that sometimes, on particularly large images, this will fail silently and display a blank image without raising an exception. Is there a flag that I can check after EndInit() to be sure the image has loaded?

HCL · Accepted Answer · 2011-08-08 13:45:35Z

3

Use the resized.DownloadFailed event to get informed.

answered Aug 8, 2011 at 13:45

HCL

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2 Comments

Dan Monego Over a year ago

Thanks! It looks like it's been happening on DecodeFailed. Is there a way to display messages to the user from these handlers? It looks like they both happen out of the UI thread.

HCL Over a year ago

@Dan: Use something like: Dispatcher.BeginInvoke(new Action(() => { /*Her comes your action*/ }), DispatcherPriority.ApplicationIdle);

Pic Mickael · Accepted Answer · 2015-06-04 02:03:10Z

0

You can also use the ImageFailed event.

answered Jun 4, 2015 at 2:03

Pic Mickael

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