What is an action filter Result executing pair?
PICTURE THIS: ASYNC / PROMISE
Call fetchPromise pending
NetworkWait off stack
Then / awaitUse the JSON
Simple meaning
OnActionExecutionAsync wraps the action
WHY — Filters instead of guessing?
Why interviewers care about Filters:
Filters questions separate people
who only read docs from people who shipped.
Keep it short, concrete,
and tied to .NET MVC work.
Stay structured
Name the idea, why it exists, then one short example.
Close cleanly
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Define it
OnActionExecutionAsync wraps the action
- 2result filters wrap the
executed IActionResult.
- 3Timing and response shaping
use these hooks.
- 4Order matters when multiple
filters apply.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Say this line
“Timing and response shaping use these hooks.”
Break into beats
Timingandresponseshapingusethese
Speaking order
2987408337471632900
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
OnActionExecutionAsync wraps the action result filters wrap the executed IActionResult.