Sep 23, 2019 02:11 PM|mgebhard|LINK
Actions are designed to return response messages like JSON not action filters. Secondly, it is too late to modify the response the action executed filter because, by definition, the action completed which means it returned the response.
The standard pattern is querying to database from the action and return whatever formatted JSON message you like.
Perhaps you are facing a design issue? Can you explain how your application works and why you are using an action executed filter to solve this programming problem?