Remove an item from an ObservableCollection in a CollectionChanged event handler

Question

I\'m hoping to be able to reject some items after they have been added to an ObservableCollection. I am not able to subclass the ObservableCollection or use any sort of view, s

Answer 1

if you really want to modify a collection you are going to want to iterate through a copy of the collection. its because you are trying to modify the collection in the foreach loop thats causing you grief.

example

var copy = new ObservableCollection(collection)
foreach(var item in copy)
{
    if(item.Name == "Fred")
    {
        collection.Remove(item);
    }

}

that said, I agree with Anurag that you shouldn't be doing this type of thing with an observablecollection and certainly not inside a CollectionChanged Event.