public static MvcHtmlString AlbumTitle(this HtmlHelper helper,Album album)
{
var urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
var container = new TagBuilder("div");
var albumTitle = new TagBuilder("a");
var artistTitle = new TagBuilder("a");
albumTitle.MergeAttribute("href", urlHelper.Action("Detail", "Album", new { id = album.Id }));
albumTitle.MergeAttribute("class", "list-item-AlbumTitle");
albumTitle.SetInnerText(album.Name);
artistTitle.MergeAttribute("href", urlHelper.Action("Albums", "Artist", new { id = album.Artist.Id }));
artistTitle.SetInnerText(album.Artist.Name);
container.InnerHtml = albumTitle.ToString() + " by " + artistTitle.ToString();
return MvcHtmlString.Create(container.ToString());
}
private void RemoveSongs(Album oldAlbum, IEnumerable<Song> newSongs)
{
var removeIds = new List<int>();
foreach (var oldSong in oldAlbum.Songs)
{
var newSong = newSongs.FirstOrDefault(song => song.Id == oldSong.Id);
if (newSong == null)
{
var dbSong = db.Songs.FirstOrDefault(song => song.Id == oldSong.Id);
if (dbSong != null)
{
removeIds.Add(oldSong.Id);
}
}
}
removeIds.ForEach(id => db.Songs.Remove(db.Songs.Find(id)));
}
private void UpdateSongs(Album oldAlbum,IEnumerable<Song> newSongs)
{
foreach (var oldSong in oldAlbum.Songs)
{
var newSong = newSongs.FirstOrDefault(song => song.Id == oldSong.Id);
if (newSong != null)
{
oldSong.Name = newSong.Name;
oldSong.Length = newSong.Length;
oldSong.SongNumber = newSong.SongNumber;
}
}
RemoveSongs(oldAlbum, newSongs);
InsertNewSongs(oldAlbum, newSongs);
}
private void InsertNewSongs(Album oldAlbum,IEnumerable<Song> newSongs)
{
foreach (var newSong in newSongs)
{
if (newSong.Id<=0 || !oldAlbum.Songs.Any(oldSong => oldSong.Id == newSong.Id))
{
oldAlbum.Songs.Add(newSong);
}
}
}