BackgroundTasks.BackgroundAudioTask.PlaybackList_CurrentItemChanged C# (CSharp) Method

        void PlaybackList_CurrentItemChanged(MediaPlaybackList sender, CurrentMediaPlaybackItemChangedEventArgs args)
        {
            // Get the new item
            var item = args.NewItem;
            Debug.WriteLine("PlaybackList_CurrentItemChanged: " + (item == null ? "null" : GetTrackId(item).ToString()));

            // Update the system view
            UpdateUVCOnNewTrack(item);

            // Get the current track
            string currentTrackId = null;
            if (item != null)
                currentTrackId = item.Source.CustomProperties[TrackIdKey] as string;

            // Notify foreground of change or persist for later
            if (foregroundAppState == AppState.Active)
                MessageService.SendMessageToForeground(new TrackChangedMessage(currentTrackId));
            else
                ApplicationSettingsHelper.SaveSettingsValue(TrackIdKey, currentTrackId?.ToString());
        }