Filters in ASP.NET MVC enable you to run code before or after a particular stage in the execution pipeline. They can be configured globally per-controller or per-action.
There are different kinds of filters, and each filter is executed at a different stage in the pipeline. For example, action filters are executed when the action method is executed.
Let us use a simple example to see how an action filter (a type of filter) works.
I have created a simple controller, DateController, where I am just displaying the time. In this action method, I am using a predefined action filter by the name of ResponseCache, that caches the response for the duration specified in seconds. In the following code snippet, we have mentioned the duration as 600 seconds. So, the response will be cached for 10 minutes.
public class DateController : Controller {
[ResponseCache(Duration = 600)]
public IActionResult Index() {
return Content(DateTime.Now.ToShortTimeString());
}
...