ASP.NET Core | Filters

Filters provide the capability to run the code before or after the specific stage in request processing pipeline, it could be either MVC app or Web API service. Filters performs the tasks like Authorization, Caching implementation, Exception handling etc. ASP.NET Core also provide the option to create custom filters. There are 5 types of filters supported in ASP.NET Core Web apps or services.

  • Authorization filters run before all or first and determine the user is authorized or not.
  • Resource filters are executed after authorization. OnResourceExecuting filter runs the code before rest of filter pipeline and OnResourceExecuted runs the code after rest of filter pipeline.
  • Action filters run the code immediately before and after the action method execution. Action filters can change the arguments passed to method and can change returned result.
  • Exception filters used to handle the exceptions globally before wrting the response body
  • Result filters allow to run the code just before or after successful execution of action results.

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