BitmapImage SetSource Crashing/Freezing App

问题

I am trying to set the image from a stream. However when I set the source from the background thread and use a dispatcher it freezes the app completely. The stream is not null, I have verified that.

I am using the taglib api to get the stream of the album picture of an mp3 file. I've tried everything.

async void Background(object sender, MediaPlayerDataReceivedEventArgs e)
{         
   IRandomAccessStream AlbumArtStream = await Media.GetAlbumArt(MediaFile.Name, await MediaFile.OpenStreamForReadAsync());

   await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
   {
        ViewModel.NewAlbumArt = new BitmapImage();
        NewAlbumArt.SetSource(AlbumArtStream);
   }
}

回答1:

Like in comment - to prevent freezing your app, call SetSoruceAsync:

async void Background(object sender, MediaPlayerDataReceivedEventArgs e)
{         
   IRandomAccessStream AlbumArtStream = await Media.GetAlbumArt(MediaFile.Name, await MediaFile.OpenStreamForReadAsync());

   await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
   {
      ViewModel.NewAlbumArt = new BitmapImage();
      await NewAlbumArt.SetSourceAsync(AlbumArtStream);
   }
}

You may read more at MSDN:

Setting an image source by calling the asynchronous SetSourceAsync method rather than the similar SetSource method avoids blocking the UI thread. ...

来源：https://stackoverflow.com/questions/23925350/bitmapimage-setsource-crashing-freezing-app