Chimney.MPD.ChimneyMPDClient.AddIdToPlaylist C# (CSharp) 메소드

        public async Task<string> AddIdToPlaylist(string file)
        {
            if (string.IsNullOrEmpty(file)) return string.Empty;

            int qId = await Send(MPDKeyWords.Client.Playlist.ADDID, 
                new List<string>(),
                new List<string>() { file } );

            string response = await Response(qId);

            if (response.EndsWith(MPDKeyWords.Response.OK_LINEBREAK))
            {
                var list = await MPDKeyWords.Response.Encode(response);

                if (list.Count > 0)
                    return list.FirstOrDefault().FirstOrDefault().Value;
            }
            return string.Empty;
        }