ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides what about INotifyCollectionChanging?

Question

I want to be able to add a range and get updated for the entire bulk.

I also want to be able to cancel the action before it\'s done (i.e. collection changing besides

Answer 1

I think AddRange is better implemented like so:

public void AddRange(IEnumerable collection)
{
    foreach (var i in collection) Items.Add(i);
    OnCollectionChanged(
        new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}

It saves you a list copy. Also if you want to micro-optimise you could do adds for up to N items and if more than N items where added do a reset.