WriteableBitmap crashes background tasks.

Question

I'm attempting to create custom tile images, but when I instantiate a WriteableBitmap within my BackgroundTask it crashes. Any idea why?

Answer 1

That's because the WriteableBitmap is a UI object in task that has no UI.  I don't believe you are going to be able to do this.  What exactly are you doing that requires a WB?

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
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Answer 2

Thanks for the response.

I was attempting to use WB to write a dynamic bitmap to LocalStorage and use it as a tile image. I just discovered the UI thread was required for WriteableBitmap :(

However, I figured out how save my pixel data using the following as a guide: http://msdn.microsoft.com/en-us/library/windows/apps/jj709935.aspx

Answer 3

You can use Deployment.Current.Dispatcher.BeginInvoke in a background task to call an Action or a Delegate that does all the work with a WriteableBitmap.