public void RegisterNotifyingObject(NotifyingObject obj)
{
Contract.Requires <ArgumentNullException>(obj != null);
RegisterNotifyingObject((INotifyPropertyChanging)obj);
RegisterNotifyingObject((INotifyPropertyChanged)obj);
}
public void RegisterNotifyingObject(NotifyingObject obj)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj), "Contract assertion not met: obj != null");
}
RegisterNotifyingObject((INotifyPropertyChanging)obj);
RegisterNotifyingObject((INotifyPropertyChanged)obj);
}