In the post Tutorial: Create your first C# Enterprise Architect addin in 10 minutes you can find a basic template that can be used to create C# add-ins for Enterprise Architect.

But this basic template is far from complete. The EA API provides a whole set of  “events” that can be used in an add-in.
To use one of these events you have to create a public operation in the add-in class that contains the signature of the event. EA will then call that operation at the appropriate time so you can execute your behavior.… Read more