Filters and Attributes

In the ASP.NET Core framework, filters and attributes are used to add additional functionality to controllers and action methods, such as authentication, authorization, caching, and exception handling.

• Filters are classes that implement one or more of the filter interfaces provided by the framework, such as IActionFilter, IResultFilter, IExceptionFilter, and IAuthorizationFilter. Filters can be applied to controllers, action methods, or globally to the entire application. They can be used to perform tasks such as logging, caching, and handling exceptions.

• Attributes are classes that derive from Attribute class, and are used to decorate controllers, action methods, or properties with additional metadata. For example, the Authorize attribute can be used to require that a user is authenticated before accessing a specific action method, and the ValidateAntiForgeryToken attribute can be used to protect against cross-site request forgery (CSRF) attacks.