How does MEF determine the order of its imports?

Question

MEF allows you to import multiple parts via the use of the ImportMany attribute. How does it determine the order in which it retrieves the relevant exports and

Answer 1

You could have the rules import each other in order (using the Decorator pattern), but then each rule will need to know about the specific rule that precedes it, which probably isn't what you want.

MEF is there to help you discover the parts, what you do with them afterwards is up to you. If you want to sort the parts then go ahead, there's nothing wrong with that!