Got here from Gabriel’s site — needed the Google Map bounding box thing sorted.

Anyway, it seems as though your coupling is still rather high since you are specifically linking the event.

I have used a slightly different mechanism I borrowed from the ESB world. I use a front-end message bus and objects can subscribe to specific messages they are interested in.

Another trick to avoid having to check for event listeners is to use an empty listener:

public event SelectedImageChangedHandler ImageSelectionChanged = delegate { };

Then you know you always have one — so now you can just raise the event.

I have an example application utilising many different techniques should you be interested:

http://www.ebenroux.co.za/page/Abacus.aspx

The plan is to extend it to demonstrate various enterprise-level techniques and technologies.

Regards,
Eben