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What are Filters and why are they important?

Entry .NET Core
Quick Answer Filters run at specific points in the MVC pipeline — before/after model binding, action execution, result execution, and exception handling. Types: Authorization (runs first), Resource, Action, Result, Exception. Filters are cleaner than middleware for MVC-specific cross-cutting concerns like logging action parameters or adding response headers per action.

Answer

Filters are extensibility points in the MVC and Razor Pages pipeline that allow code to run before or after critical stages.

Types of filters include:

  • Authorization filters
  • Resource filters
  • Action filters
  • Exception filters
  • Result filters

They are ideal for cross-cutting concerns like logging, caching, auditing, authorization, and exception handling without polluting controller or page logic.

S
SugharaIQ Editorial Team Verified Answer

This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.

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Source: SugharaIQ

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