private void RemoveListener(INotifyPropertyChanged source, string propertyName, IWeakEventListener listener, EventHandler <PropertyChangedEventArgs> handler)
{
using (WriteLock)
{
HybridDictionary dict = (HybridDictionary)this[source];
if (dict != null)
{
ListenerList list = (ListenerList)dict[propertyName];
if (list != null)
{
// make sure list is ready for writing
if (ListenerList.PrepareForWriting(ref list))
{
dict[propertyName] = list;
}
// remove a listener from the list
if (handler != null)
{
ListenerList <PropertyChangedEventArgs> hlist = (ListenerList <PropertyChangedEventArgs>)list;
hlist.RemoveHandler(handler);
}
else
{
list.Remove(listener);
}
// when the last listener goes away, remove the list
if (list.IsEmpty)
{
dict.Remove(propertyName);
}
}
if (dict.Count == 0)
{
StopListening(source);
Remove(source);
}
dict.Remove(AllListenersKey); // invalidate list of all listeners
_proposedAllListenersList = null;
}
}
}
private void RemoveListener(object source, object target, Delegate handler)
{
object sourceKey = (source != null) ? source : StaticSource;
using (Table.WriteLock)
{
ListenerList list = (ListenerList)Table[this, sourceKey];
if (list != null)
{
// make sure list is ready for writing
if (ListenerList.PrepareForWriting(ref list))
{
Table[this, sourceKey] = list;
}
// remove the target from the list of listeners
if (handler != null)
{
list.RemoveHandler(handler);
}
else
{
list.Remove((IWeakEventListener)target);
}
// after removing the last listener, stop listening
if (list.IsEmpty)
{
Table.Remove(this, sourceKey);
StopListening(source);
}
}
}
}
