private async void AllMusic_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
MusicCollection.AddRange(e.NewItems.Cast <LocalMusic>());
// ArtistCollection.AddRange(e.NewItems.Cast<LocalMusic>());
AlbumCollection.AddRange(e.NewItems.Cast <LocalMusic>());
break;
case NotifyCollectionChangedAction.Remove:
foreach (LocalMusic item in e.OldItems)
{
MusicCollection.Remove(item);
// ArtistCollection.Remove(item);
AlbumCollection.Remove(item);
}
await ArtistCollection.AddRangeAsync(AllMusic.GroupBy(x => x.ArtistsName?.FirstOrDefault() ?? "未知艺术家").ToDictionary(x => x.Key, x => x.ToArray())
.Select(x =>
new LocalArtist
{
Name = x.Key,
PicPath = x.Value.First().Id3Pic,
LocalMusics = x.Value
}));
break;
case NotifyCollectionChangedAction.Replace:
break;
case NotifyCollectionChangedAction.Move:
break;
case NotifyCollectionChangedAction.Reset:
MusicCollection.Clear();
ArtistCollection.Clear();
AlbumCollection.Clear();
break;
default:
throw new ArgumentOutOfRangeException();
}
}