protected void AddWeakEventListener(INotifyPropertyChanged source, PropertyChangedEventHandler handler)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
PropertyChangedEventListener listener = new PropertyChangedEventListener(source, handler);
propertyChangedListeners.Add(listener);
PropertyChangedEventManager.AddListener(source, listener, "");
}
protected void RemoveWeakEventListener(INotifyPropertyChanged source, PropertyChangedEventHandler handler)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
PropertyChangedEventListener listener = propertyChangedListeners.LastOrDefault(l =>
l.Source == source && l.Handler == handler);
if (listener != null)
{
propertyChangedListeners.Remove(listener);
PropertyChangedEventManager.RemoveListener(source, listener, "");
}
}
