private void SaveChanges()
{
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
dbContext.Attach(this.data);
dbContext.SaveChanges();
}
}
private void LoadAlbums()
{
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
dbContext
.Attach(this.data)
.Collection(artist => artist.Albums)
.Load();
}
}
private void LoadSongs()
{
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
dbContext
.Attach(this.data)
.Collection(album => album.Songs)
.Load();
}
}
private bool LoadFavorite()
{
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
return(dbContext
.Attach(this.data)
.Collection(artist => artist.Albums)
.Query()
.GroupJoin(dbContext.Songs, album => album.AlbumId, song => song.SongId, (album, songs) => songs)
.All(songs => songs.All(song => song.Favorite)));
}
}
private bool LoadFavorite()
{
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
return(this.anySongs &&
dbContext
.Attach(this.data)
.Collection(album => album.Songs)
.Query()
.All(song => song.Favorite));
}
}
private void FavoriteAllSongs(bool favorite)
{
this.LoadSongs();
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
foreach (Song song in this.data.Songs)
{
song.Favorite = favorite;
dbContext
.Attach(song)
.Property(_song => _song.Favorite)
.IsModified = true;
}
dbContext.SaveChanges();
}
}
private void FavoriteAllSongs(bool favorite)
{
this.LoadAlbums();
using (MusicLibraryContext dbContext = new MusicLibraryContext())
{
foreach (Album album in this.data.Albums)
{
List <Song> songs = dbContext.Songs.Where(song => song.AlbumId == album.AlbumId).ToList();
foreach (Song song in songs)
{
song.Favorite = favorite;
dbContext
.Attach(song)
.Property(_song => _song.Favorite)
.IsModified = true;
}
}
dbContext.SaveChanges();
}
}