Associate List<T>.Remove to an event in C#?

I have a Products:List<Product> class. I'd like to make it so that every time that I remove an item from that list, my program decreases a counter.

Is there a way to do it without overriding the Remove method or decreasing it manually? And if there is none, anybody knows where I can find the code for the Remove method?

Thanks!

I thought about associating the Remove method to an event, but I don't know how to do it without overriding it or creating another method with the Remove method and the event inside it. Excuse me for my ignorance, but I'm just getting开发者_运维问答 into OOP programming.

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You could use an ObservableCollection<Product>. It is in System.Collections.ObjectModel It will fire an event when the collection changed. The arguments of the event will tell you if it is an removal, an addition etc.

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List do not provide any event. So you might have to drive from this class and shadow the remove method to fire an event

public new bool Remove()
{
   bool removed = base.Remove();
   if(removed)
   {
       OnRemoved();
   }
   return removed;
}

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This would be a quick and dirty way to meet your requirement, but I think there might be more to what you're trying to achieve:

class Strings : List<String> {
    private Int32 _numberOfRemovals = 0;

    public Int32 NumberOfRemovals {
        get { return _numberOfRemovals; }
    }

    public new void Remove(String s) {
        base.Remove(s);
        _numberOfRemovals--;
    }
}