Creating BitmapImage on background thread WP7

问题

I'm receiving an UnauthorizedAccessException ("Invalid cross-thread access.") when running the following code on a background (threadpool) thread, is this expected behaviour?

 var uri = new Uri("resourcevault/images/defaultSearch.png", UriKind.Relative);
 var info = Application.GetResourceStream(uri);

 // this line throws exception....
 this.defaultSearchImage = new BitmapImage();

回答1:

The reason is because your background thread cannot directly be used to update the UI. Instead, you need to use a Dispatcher to marshal the data on to the UI thread. Something like this:

var uri = new Uri("resourcevault/images/defaultSearch.png", UriKind.Relative);
var info = Application.GetResourceStream(uri);

Dispatcher.BeginInvoke(() => {        
    this.defaultSearchImage = new BitmapImage();
});

来源：https://stackoverflow.com/questions/6518783/creating-bitmapimage-on-background-thread-wp7