Quick Answer
Filters add cross-cutting behavior at specific pipeline stages: AuthorizationFilter (access control), ResourceFilter (caching, short-circuit), ActionFilter (pre/post action execution — logging, validation), ResultFilter (transform result), ExceptionFilter (handle exceptions per action). Scope: global, per-controller, per-action. Ordered by scope and then IOrderedFilter priority.
Answer
Filters plug into the MVC and Razor Pages lifecycle at well-defined points.
Common use cases:
Authorization checks.
Logging and diagnostics.
Caching and response shaping.
Exception handling and error translation.
Pre/post action logic such as measuring execution time.
S
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Verified Answer
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