public bool Purge(bool purgeAll)
{
bool foundDirt = false;
if (!purgeAll)
{
// copy the keys into a separate array, so that later on
// we can change the dictionary while iterating over the keys
ICollection ic = _dict.Keys;
String[] keys = new String[ic.Count];
ic.CopyTo(keys, 0);
for (int i = keys.Length - 1; i >= 0; --i)
{
if (keys[i] == AllListenersKey)
{
continue; // ignore the special entry for now
}
// for each key, remove dead entries in its list
PropertyRecord pr = (PropertyRecord)_dict[keys[i]];
if (pr.Purge())
{
foundDirt = true;
}
// if there are no more entries, remove the key
if (pr.IsEmpty)
{
pr.StopListening(_type);
_dict.Remove(keys[i]);
}
}
if (foundDirt)
{
// if any entries were purged, invalidate the special entry
_dict.Remove(AllListenersKey);
_proposedAllListenersList = null;
}
if (IsEmpty)
{
StopListening();
}
}
else
{
// stop listening. List cleanup is handled by Purge()
foundDirt = true;
StopListening();
foreach (DictionaryEntry de in _dict)
{
PropertyRecord pr = (PropertyRecord)de.Value;
pr.StopListening(_type);
}
}
return(foundDirt);
}
public bool Purge(bool purgeAll)
{
bool foundDirt = false;
if (!purgeAll)
{
if (!MS.Internal.BaseAppContextSwitches.EnableWeakEventMemoryImprovements)
{
// copy the keys into a separate array, so that later on
// we can change the dictionary while iterating over the keys
ICollection ic = _dict.Keys;
String[] keys = new String[ic.Count];
ic.CopyTo(keys, 0);
for (int i = keys.Length - 1; i >= 0; --i)
{
if (keys[i] == AllListenersKey)
{
continue; // ignore the special entry for now
}
// for each key, remove dead entries in its list
PropertyRecord pr = (PropertyRecord)_dict[keys[i]];
if (pr.Purge())
{
foundDirt = true;
}
// if there are no more entries, remove the key
if (pr.IsEmpty)
{
pr.StopListening(_type);
_dict.Remove(keys[i]);
}
}
#if WeakEventTelemetry
_manager.LogAllocationRelay(ic.GetType(), 1, 12); // dict.Keys - Hashtable+KeyCollection
_manager.LogAllocationRelay(typeof(String[]), 1, 12 + ic.Count * 4); // keys
#endif
}
else
{
Debug.Assert(_toRemove.Count == 0, "to-remove list should be empty");
// enumerate the dictionary using IDE explicitly rather than
// foreach, to avoid allocating temporary DictionaryEntry objects
IDictionaryEnumerator ide = _dict.GetEnumerator() as IDictionaryEnumerator;
while (ide.MoveNext())
{
String key = (String)ide.Key;
if (key == AllListenersKey)
{
continue; // ignore the special entry for now
}
// for each key, remove dead entries in its list
PropertyRecord pr = (PropertyRecord)ide.Value;
if (pr.Purge())
{
foundDirt = true;
}
// if there are no more entries, remove the key
if (pr.IsEmpty)
{
pr.StopListening(_type);
_toRemove.Add(key);
}
}
// do the actual removal (outside the dictionary iteration)
if (_toRemove.Count > 0)
{
foreach (String key in _toRemove)
{
_dict.Remove(key);
}
_toRemove.Clear();
_toRemove.TrimExcess();
}
#if WeakEventTelemetry
Type enumeratorType = ide.GetType();
if (enumeratorType.Name.IndexOf("NodeEnumerator") >= 0)
{
_manager.LogAllocationRelay(enumeratorType, 1, 24); // ListDictionary+NodeEnumerator
}
else
{
_manager.LogAllocationRelay(enumeratorType, 1, 36); // Hashtable+HashtableEnumerator
}
#endif
}
if (foundDirt)
{
// if any entries were purged, invalidate the special entry
_dict.Remove(AllListenersKey);
_proposedAllListenersList = null;
}
if (IsEmpty)
{
StopListening();
}
}
else
{
// stop listening. List cleanup is handled by Purge()
foundDirt = true;
StopListening();
foreach (DictionaryEntry de in _dict)
{
PropertyRecord pr = (PropertyRecord)de.Value;
pr.StopListening(_type);
}
}
return(foundDirt);
}