What is action filter attribute in MVC?

ASP.NET MVC provides Action Filters for executing filtering logic either before or after an action method is called. Action Filters are custom attributes that provide declarative means to add pre-action and post-action behavior to the controller’s action methods.

What are action filters in MVC with example?

Filters in ASP.NET MVC

Filter Type	Interface	Description
Action	IActionFilter	These Runs before and after the action method.
Result	IResultFilter	Runs before and after the action result are executed.
Exception	IExceptionFilter	Runs only if another filter, the action method, or the action resultthrows an exception.

Which attribute is used to derive the action filter?

You can create a custom action filter in two ways, first, by implementing the IActionFilter interface and the FilterAttribute class. Second, by deriving the ActionFilterAttribute abstract class.

Which filter execute first in MVC?

Authentication filters are new addition from MVC 5. These filters kick in first in the request life cycle and perform the authentication logic. Authorization filters are executed after the Authentication filters successfully executed and authorizes users roles to ensure current user has access to request resource.

What are the types of action filters in MVC?

The ASP.NET MVC framework supports four different types of filters:

• Authorization filters – Implements the IAuthorizationFilter attribute.
• Action filters – Implements the IActionFilter attribute.
• Result filters – Implements the IResultFilter attribute.
• Exception filters – Implements the IExceptionFilter attribute.

What is output caching in MVC?

The output cache enables you to cache the content returned by a controller action. Output caching basically allows you to store the output of a particular controller in the memory. Hence, any future request coming for the same action in that controller will be returned from the cached result.

Which filter is executed last in MVC?

Exception Filters − Exception filters are the last type of filter to run. You can use an exception filter to handle errors raised by either your controller actions or controller action results.

What is ViewBag and ViewData in MVC?

ViewData and ViewBag are used for the same purpose — to transfer data from controller to view. ViewData is nothing but a dictionary of objects and it is accessible by string as key. ViewBag is very similar to ViewData. ViewBag is a dynamic property (dynamic keyword which is introduced in . net framework 4.0).

How can use HandleError attribute in MVC?

We can register HandleError attribute as a global error handling filter. Open Global. asax file and add the code, given below: protected void Application_Start()…config file and add the following line of code:

How do filters work in MVC?

Filters are used to inject extra processing logic in the MVC request-response pipeline. You have seen in my previous article in the section of “Pipeline in MVC”, the HTTP request comes to “Routing” then goes to “Controller Initialization” then “Action Execution” and the “Result Execution” comes into action to render the view.

What is an action filter?

Action filters allow pre and post processing logic to be applied to an action method. Action filters are generally used to apply cross-cutting concerns such as logging, caching, authorization etc. Action filter can be registered as other filters at global, controller or action method level.

What is MVC pipeline?

Routing is the first step in ASP.NET MVC pipeline. typically, it is a pattern matching system that matches the incoming request to the registered URL patterns in the Route Table.