public IEnumerable <LibraryItem> Expand(LibraryItem parent)
{
if (parent is Artist && m_ArtistExpansion.ContainsKey(parent))
{
return(m_ArtistExpansion[parent].ToList());
}
else if (parent is Album && m_AlbumExpansion.ContainsKey(parent))
{
return(m_AlbumExpansion[parent].ToList());
}
else if (parent is Genre && m_GenreExpansion.ContainsKey(parent))
{
return(m_GenreExpansion[parent].ToList());
}
else if (parent is GenreFilteredAlbum && m_GenreFilteredAlbumExpansion.ContainsKey(parent))
{
return(m_GenreFilteredAlbumExpansion[parent].ToList());
}
throw new Exception("Database.Expand(): cannot expand object: " + parent.ToString());
}
