ChobiQ.DoubanFMAPICodePack.DoubanFMClient.DequeueToHistory C# (CSharp) Method

        private Song DequeueToHistory(PlayOperation operationType)
        {
            if (_playlist.Count > 0)
            {
                var song = _playlist.Dequeue();
                _history.AddSong(song, operationType);

                if (_playlist.Count == 1)
                {
                    PlaylistRequest request = new PlaylistRequest(
                        _status, _history, PlayOperation.PlayingLast,
                        CurrentChannel, CurrentSong);

                    var resp = request.GetResponse();

                    ExtractPlaylist(resp, false);
                }

                return song;
            }
            else
            {
                return null;
            }
        }