internal AutomationPeer[] GetAutomationRoots()
{
LayoutEventList.ListItem [] copy = AutomationEvents.CopyToArray();
AutomationPeer[] peers = new AutomationPeer[copy.Length];
int freeSlot = 0;
for (int i = 0; i < copy.Length; i++)
{
LayoutEventList.ListItem item = copy[i];
//store peer here in case if thread gets pre-empted between check for IsAlive and invocation
//and GC can run making something that was alive not callable.
AutomationPeer peer = null;
try
{
// this will return null if element is already GC'ed
peer = (AutomationPeer)(item.Target);
}
catch (InvalidOperationException) //this will happen if element is being resurrected after finalization
{
peer = null;
}
if (peer != null)
{
peers[freeSlot++] = peer;
}
}
return(peers);
}
private void fireAutomationEvents()
{
//no reentrancy. It may happen if one of handlers calls UpdateLayout synchronously
if (_inFireAutomationEvents)
{
return;
}
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordLayout, EventTrace.Level.Verbose, EventTrace.Event.WClientLayoutFireAutomationEventsBegin);
try
{
_inFireAutomationEvents = true;
_firePostLayoutEvents = false;
LayoutEventList.ListItem [] copy = AutomationEvents.CopyToArray();
for (int i = 0; i < copy.Length; i++)
{
LayoutEventList.ListItem item = copy[i];
//store peer here in case if thread gets pre-empted between check for IsAlive and invocation
//and GC can run making something that was alive not callable.
AutomationPeer peer = null;
try
{
// this will return null if element is already GC'ed
peer = (AutomationPeer)(item.Target);
}
catch (InvalidOperationException) //this will happen if element is being resurrected after finalization
{
peer = null;
}
if (peer != null)
{
peer.FireAutomationEvents();
// if handler dirtied the tree, go clean it again before calling other handlers
if (hasDirtiness)
{
break;
}
}
else
{
AutomationEvents.Remove(item);
}
}
}
finally
{
_inFireAutomationEvents = false;
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordLayout, EventTrace.Level.Verbose, EventTrace.Event.WClientLayoutFireAutomationEventsEnd);
}
}