Closed Issue: ApiControllerActionSelector's GetActionMapping should not return action descriptors for NonAction decorated methods. [1220]

This currently causes a problem for attribute routing in the scenario of DefaultRoute attribute usage. When DefaultRoute attribute is used we automatically add routes for all the actions which do not have explicit route templates on them.

Attribute routing internally uses GetActionMapping which is currently returning NonAction decorated methods too which is causing them to be added into the routes.
Comments: Verified