public static Playlist Deserialize(XElement xml)
{
Playlist playlist = null;
Guid id;
var idElement = xml.Descendants("Id").FirstOrDefault();
var nameElement = xml.Descendants("Name").FirstOrDefault();
var tracksElement = xml.Descendants("Tracks").FirstOrDefault();
if (null != nameElement &&
null != idElement &&
Guid.TryParse(idElement.Value, out id) &&
null != tracksElement)
{
playlist = new Playlist()
{
Name = nameElement.Value,
Id = id
};
foreach(var trackElement in tracksElement.Descendants("Track"))
{
playlist.Tracks.Add(Track.Deserialize(trackElement));
}
}
else
{
Debug.WriteLine("Playlist: Invalid track XML");
}
return playlist;
}
public async Task<Guid> StartNewPlaylist(string name, List<Track> tracks, bool persist)
{
await this.saveCurrentPlaylistToFile();
var newPlaylist = new Playlist(name, Guid.NewGuid());
newPlaylist.Tracks = new ObservableCollection<Track>(tracks);
this.CurrentPlaylist = newPlaylist;
await this.saveCurrentPlaylistToFile();
return newPlaylist.Id;
}
private async Task<Playlist> loadPlaylistFromFile(Guid playlistId)
{
Playlist playlist = null;
var fileName = playlistId.ToString() + ".playlist";
var folder = Windows.Storage.ApplicationData.Current.LocalFolder;
try
{
var playlistFile = await folder.GetFileAsync(fileName);
var xmlString = await FileIO.ReadTextAsync(playlistFile);
var xml = XElement.Parse(xmlString);
playlist = Playlist.Deserialize(xml);
}
catch(FileNotFoundException)
{
Debug.WriteLine("RadioLocalPresetManager: Playlist file not found - " + fileName);
}
catch(XmlException)
{
Debug.WriteLine("RadioLocalPresetManager: Playlist file was corrupt, deleting - " + fileName);
File.Delete(fileName);
}
return playlist;
}