Performing expensive operations on ObservableCollection.CollectionChanged

Question

In my model, I need to know when a particular collection changes, so I subscribe to the CollectionChanged ObservableCollection event. This works very well, except that the operation is quite expensive.

So, when is the client code:

foreach(Item i in longList)
{
    model.ObservableCollection.Add(i);
}

I perform an expensive operation for each iteration when all that matters is the result after adding the last element.

Is there a way to cancel the current event handler if another CollectionChanged event was raised while the first is still running - and then go on to handle the last event?

Answer 1

ObservableCollection . BeginUpdate EndUpdate() IsUpdating.

Answer 2

. , , - , .

, CollectionChanged, . , CollectionChanged, , "tick".