private void OnPhotoCameraInitialized(object sender, CameraOperationCompletedEventArgs e) { int width = Convert.ToInt32(_photoCamera.PreviewResolution.Width); int height = Convert.ToInt32(_photoCamera.PreviewResolution.Height); _luminance = new PhotoCameraLuminanceSource(width, height); _reader = new QRCodeReader(); Dispatcher.BeginInvoke(() => { _previewTransform.Rotation = _photoCamera.Orientation; _timer.Start(); }); }