private void AddSongToArtist(string artist, string album, Song song)
{
if (!Artists.ContainsKey(artist))
{
Artists.Add(artist, new Artist(artist));
}
Artists[artist].AddSong(album, song);
}
private Artist GetOrCreateArtist(string artist)
{
string key = artist ?? UnknownArtist;
if (!Artists.ContainsKey(key))
{
Artists[key] = new Artist(key);
}
return(Artists[key]);
}