ThreadPool and Dispatcher sharing Stream?

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Im trying to do this:

C#

using (var albm = isoStore.CreateFile("shared/media/" + dlSongInfo.id + "-NP"))
                        {
                            Deployment.Current.Dispatcher.BeginInvoke(() =>
                             {
                                 BitmapImage image = new BitmapImage();
                                 image.SetSource(e.Result);
                                 WriteableBitmap wb = new WriteableBitmap(image);

                                 wb.SaveJpeg(albm, 358, 358, 0, 100);
                             });
                        }

But it said that the stream is closed when doing the SaveJpeg. I guess that because there in different threads it can't access it? How can I achieve this. Or is is an alternative way of writing a bitmap image from a stream without needing to use a UI thread?

P.S. This is execute on a ThreadPool.

Posted 26-Aug-12 6:39am

Zumicts

Updated 26-Aug-12 6:40am

v2

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Tekahe · Accepted Answer · 2012-08-26T18:00:00

The using statement disposes your object before (in most cases) your Delegate gets executed. On single core machines you could see a race here, because sometimes it could work but mostly it won't. Simply don't put all this in a using statement but instead create the albm object normally and dispose it in the delegate you're calling.

C#

var albm = isoStore.CreateFile("shared/media/" + dlSongInfo.id + "-NP"));
Deployment.Current.Dispatcher.BeginInvoke(() => {
  try {
    BitmapImage image = new BitmapImage();
    image.SetSource(e.Result);
    WriteableBitmap wb = new WriteableBitmap(image);
    wb.SaveJpeg(albm, 358, 358, 0, 100);
  } finally {
    albm.Dispose();
  }
});