/// <summary>
/// Cleans up all weak event delegates. Must be done on a regular basis.
/// </summary>
protected static void GarbageCollect()
{
int idx = 0;
lock (_syncObj)
{
int max;
bool needCleanup = false;
while (idx < (max = _delegates.Count))
{
max = Math.Min(max, idx + NUM_PASS);
for (; idx < max; idx++)
{
WeakReference wp = _delegates[idx];
WeakEventMulticastDelegate wemd = (WeakEventMulticastDelegate)wp.Target;
if (wemd == null)
{
needCleanup = true;
continue;
}
wemd.GarbageCollectHandlers();
}
Monitor.PulseAll(_syncObj); // Interrupt the work to let other threads work
}
if (needCleanup)
{
ICollection <WeakReference> oldDelegates = _delegates;
_delegates = new List <WeakReference>(oldDelegates.Count);
foreach (WeakReference p in oldDelegates)
{
if (p.Target != null)
{
_delegates.Add(p);
}
}
}
}
}