What are filters in ASP.NET MVC and how do I use them?

What are filters in ASP.NET MVC and how do I use them?

Filters in ASP.NET MVC are attributes that allow you to run code before or after an action method executes. They can be used for tasks like authentication, logging, and error handling.

Can you give me an example of a custom action filter?

Sure! You can create a custom action filter by inheriting from the ActionFilterAttribute class and overriding the OnActionExecuting method. Here's a simple example:

public class MyCustomFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        // Your custom logic here
    }
}

How do I apply this filter to a controller?

You can apply the filter to a controller by decorating the controller class or specific action methods with the [MyCustomFilter] attribute. For example:

[MyCustomFilter]
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }
}

What are the different types of filters available in ASP.NET MVC?

ASP.NET MVC provides several types of filters: Action Filters, Authorization Filters, Result Filters, and Exception Filters. Each serves a different purpose in the request processing pipeline.