Hands-On RESTful Web Services with ASP.NET Core 3

Introduction to filters

Filters come in handy when we wish to build cross-cutting concepts in the MVC stack of ASP.NET Core. They are useful when we wish to implement features such as authorization or caching. ASP.NET Core provides some out-of-the-box filter types. Each of these can be used for a specific purpose in our service:

Filter type	Type description
Authorization	This kind of filter is related to the authorization of users. It is the first filter that's executed in the filter pipeline and can short-circuit the pipeline of requests.
Resource	Resource filters run immediately after authorization filters and after the rest of the pipeline has completed. They're useful when we wish to implement caching or for performance implementations. ...