public void Unregister(Track track)
{
if (track == null)
{
throw new ArgumentNullException("track");
}
else if (!m_tracks.Remove(track))
{
throw new ArgumentException("Track is not registered.");
}
}
public void Register(Track track)
{
if (track == null)
{
throw new ArgumentNullException("track");
}
else if (m_tracks.Contains(track))
{
throw new ArgumentException("Track has already been registered.");
}
m_tracks.Add(track);
}