Routing , Action , Filters in MVC Asp.Net : Part 2

Routing

• It is the process of directing the http request to a proper controller & to its action.
• It is implemented by System.Web.Routing

Actions

• Action/Action Methods are responsible to execute & generate response.
• Action are the ultimate request destination in MVC application

Filters

• They are custom classes that provide both i.e. pre-action and post-action behaviour to controller action methods.

There are 4 types of filter in Mvc Asp.Net

• Authorization Filter
• Action Filter
• Result Filter
• Exception Filter

Authorization Filter

• It is the filter whose attribute is used to allow or restrict the action to the user depending on its role or rights.
• Attributes are : [Authorize]
• Methods :
• void OnAuthorization(AuthorizationContext filterContext);

Action Filter

• It is used to implement logic before and after controller action executes.
• Attributes : [OutputCache] , [Authorize] , [HandleError] , [RequireHttpsAttribute]
• Method
• void OnActionExecuted(ActionExecutedContext filterContext);
• void OnActionExecuting(ActionExecutingContext filterContext);

Result Filter

• It contains logic that is executed before and after a view result is executed.
• The view result can be modified before you want to render it to the browser.

Exception Filter

• Exception filter are last type in filters,
• It is used to handle error either by controller action or controller action result.
• It can be also used to log error