Event Handlers synchronization

Question

I have a loop:

List<FrameworkElement> list;
public void Foo(object sender, PrintPageEventArgs e)
{
  foreach(FrameworkElement fe in list)
  {
    fe.LayoutUpdated += FeLayoutUpdated;
    fe.UpdateLayout();
  }
  if(counter >= lista.Count)
    e.PageVisual = objectFromClass. // was DoSth()
}
int counter = 0;
void FeLayoutUpdated(object sender, EventArgs e)
{
  counter++
}

So I need DoSth() to be fired always when Foo() is fired and when all FrameworkElement objects from list will have it's Layout updated. I was trying to use some Thread class and also BackgroundWorker, but I couldn't reach desired behaviour, which is that main Thread is waiting for fe.UpdateLayout's to finish their jobs. I hope I made the main idea clear. Thanks for replies.

Answer 1

A quick solution to move after code in event handler such as

void FeLayoutUpdated(object sender, EventArgs e)
{
  counter++;
  if(counter >= lista.Count)
    DoSth();
}

Answer 2

Is there a reason why this:-

public void Foo(List<FrameworkElement> list) 
{ 
  foreach(FrameworkElement fe in list) 
  { 
    fe.UpdateLayout(); 
  } 
  DoSth(); 
}

Doesn't work for you? (Note Foo should be called on the main UI thread).