What are ASP.NET MVC filters and how do they work?

What are ASP.NET MVC filters and how do they work?

ASP.NET MVC filters are attributes that allow you to run code before or after specific stages in the request processing pipeline. They can be used for tasks like authentication, logging, and error handling.

Can you explain the different types of filters available in ASP.NET MVC?

Sure! There are several types of filters: Authorization filters, Action filters, Result filters, and Exception filters. Each serves a different purpose in the request lifecycle.

How do I create a custom filter in ASP.NET MVC?

To create a custom filter, you need to implement one of the filter interfaces, such as IActionFilter or IAuthorizationFilter, and then override the appropriate methods.

Can filters be applied globally or just to specific actions?

Yes, filters can be applied globally by registering them in the FilterConfig class, or they can be applied to specific actions or controllers using attributes.

What are some common use cases for using filters?

Common use cases include logging requests, handling exceptions, enforcing authorization, and modifying the response before it is sent to the client.