protected async override void OnNavigatedFrom(NavigationEventArgs e)
{
await Task.Run(() =>
{
Cancellation.Cancel();
ExitLocker.WaitOne();
ExitLocker.Dispose();
ExitLocker = null;
Cancellation.Dispose();
Cancellation = null;
});
Windows.ApplicationModel.Core.CoreApplication.LeavingBackground -= CoreApplication_LeavingBackground;
Windows.ApplicationModel.Core.CoreApplication.EnteredBackground -= CoreApplication_EnteredBackground;
if (Capture != null)
{
await Capture.ClearEffectsAsync(MediaStreamType.VideoPreview);
if (Capture.CameraStreamState == Windows.Media.Devices.CameraStreamState.Streaming)
{
await Capture.StopPreviewAsync();
}
Capture = null;
}
MediaCaptureProvider.Dispose();
CaptureControl.Source = null;
CosmeticsList.Clear();
CosmeticsList = null;
StayAwake.RequestRelease();
StayAwake = null;
}
private async void CoreApplication_EnteredBackground(object sender, EnteredBackgroundEventArgs e)
{
var Deferral = e.GetDeferral();
await Capture.ClearEffectsAsync(MediaStreamType.VideoPreview);
await Capture.StopPreviewAsync();
Capture = null;
MediaCaptureProvider.Dispose();
CaptureControl.Source = null;
StayAwake.RequestRelease();
Deferral.Complete();
}