Binding a parent to an event of a child (list)

triplea posted on Thursday, July 19, 2007

I have seen a couple of posts wherein it was mentioned that if a parent needs to act when a child is modified, its good practice to capture the modification event of the child from the parent and act then.
In my case I have something like: Customer (Editable Root) - Orders (Child list of Order objects). I need to set a value on Customer when a specific Order type is added.
In the Initialize() method of Customer I added this: this._orders.ListChanged += <event handler> as well as override the OnListChanged on Orders. Although OnListChanged is fired, the event handler of _orders.ListChanged never does. Makes me wonder what I have done wrong here...

RockfordLhotka replied on Friday, July 20, 2007

If you override OnListChanged, you must call base.OnListChanged or you will have prevented the event from being raised.