private void UpdateSongGenres(string[] selectedGenres, Song songToUpdate)
{
if (selectedGenres == null)
{
songToUpdate.SongGenres = new List <SongGenre>();
return;
}
var selectedGenresHS = new HashSet <string>(selectedGenres);
var songGenres = new HashSet <int>
(songToUpdate.SongGenres.Select(c => c.Genre.GenreID));
foreach (var genre in repository.Genres())
{
if (selectedGenresHS.Contains(genre.GenreID.ToString()))
{
if (!songGenres.Contains(genre.GenreID))
{
songToUpdate.SongGenres.Add(new SongGenre {
SongID = songToUpdate.SongID, GenreID = genre.GenreID
});
}
}
else
{
if (songGenres.Contains(genre.GenreID))
{
SongGenre SongGenreToRemove = songToUpdate.SongGenres.FirstOrDefault(i => i.GenreID == genre.GenreID);
repository.DeleteSongGenre(SongGenreToRemove);
}
}
}
}