BackgroundAudioTask.MyBackgroundAudioTask.OnCanceled C# (CSharp) Method

        private void OnCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
        {
            // You get some time here to save your state before process and resources are reclaimed
            Debug.WriteLine("MyBackgroundAudioTask " + sender.Task.TaskId + " Cancel Requested...");
            try
            {
                // immediately set not running
                backgroundTaskStarted.Reset();

                // save state
                ApplicationSettingsHelper.SaveSettingsValue(ApplicationSettingsConstants.TrackId, GetCurrentTrackId() == null ? null : GetCurrentTrackId().ToString());
                ApplicationSettingsHelper.SaveSettingsValue(ApplicationSettingsConstants.Position, BackgroundMediaPlayer.Current.Position.ToString());
                ApplicationSettingsHelper.SaveSettingsValue(ApplicationSettingsConstants.BackgroundTaskState, BackgroundTaskState.Canceled.ToString());
                ApplicationSettingsHelper.SaveSettingsValue(ApplicationSettingsConstants.AppState, Enum.GetName(typeof(AppState), foregroundAppState));

                // unsubscribe from list changes
                if (playbackList != null)
                {
                    playbackList.CurrentItemChanged -= PlaybackList_CurrentItemChanged;
                    playbackList = null;
                }

                // unsubscribe event handlers
                BackgroundMediaPlayer.MessageReceivedFromForeground -= BackgroundMediaPlayer_MessageReceivedFromForeground;
                smtc.ButtonPressed -= smtc_ButtonPressed;
                smtc.PropertyChanged -= smtc_PropertyChanged;

                BackgroundMediaPlayer.Shutdown(); // shutdown media pipeline
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.ToString());
            }
            deferral.Complete(); // signals task completion.
            Debug.WriteLine("MyBackgroundAudioTask Cancel complete...");
        }