Additional information added to a delegate

Perhaps this question has been asked and solved many times, but I may be using the wrong terms, for I've not come up with an answer thus far.

So I have an ObservableCollection and I've used reflection to call the 'CollectionChanged' event handler.

It looks like this ('o' being the ObservableCollection in question, also obtained by reflection):

                EventInfo evi = o.GetType().GetEvent("CollectionChanged", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
                var eventHandler = new Action<object, NotifyCollectionChangedEventArgs>(
                    (s, a) => 
                    {
                        // Event code here
                    });

                 var del = Delegate.CreateDelegate(evi.EventHandlerType, eventHandler.Method);

                 evi.AddEventHandler(o, del);

The calling of this action is automated and is called on a change to the elements of the property 'o'. I can call message boxes and such like, but I wish to capture some kind of information inside this action. In particular, the class in which this all sits has an ID which is a simple int. I would like to capture this int and use it within the action. I can't seem to add any additional parameters due to the automated nature of it, so I'm not sure how to manage that.