MVC || Routing || Default Routing

MVC Routing –

 

The default ASP.NET MVC routing rules are registered within the "RegisterRoutes" method of this class:

 

public void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}");   routes.MapRoute( "Default", // Route name – Line 1 "{controller}/{action}/{id}", // URL w/ params – Line 2 new { controller="Home", action="Index", id="" } // Param defaults – Line 3   ); }   protected void Application_Start() {     RegisterRoutes(RouteTable.Routes); }

 

 

Line 2 –

 

-          "controller" is the name of the controller class to instantiate,

-          "action" is the name of a public method to invoke on it, and

-          "id" is an optional parameter embedded within the URL that can be passed as an argument to the method

 

 

Line 3 –

 

-          A set of default values to use when the url request values in the format "controller/action/id" -  does not matches the rule defined in Line 2.

-          The Default route includes defaults for all three parameters.

 

-          If you don't supply a controller, then the controller parameter defaults to the value Home.

-          If you don't supply an action, the action parameter defaults to the value Index.

-          Finally, if you don't supply an id, the id parameter defaults to an empty string.

 

 

e.g.

 

/Dinners/Details/3	/Dinners	http://localhost
Controller = Dinners Action = Details Id = 3	Controller = Dinners Action = Index Id = ��	Controller = Home Action = Index Id = ��

 

 

This wil map to –

 

 

 

Controller Actions – Based on the Default routing

 

/Home /Home/Index /Home/Index/3  -- Here the Id is ignored	/Home/Index/3 /Home/Index  -- Error	/Home/Index/3 /Home/Index  -- Pass
[HandleError]     public class HomeController : Controller     {         public ActionResult Index()         {             return View();         }     }	[HandleError]     public class HomeController : Controller     {         public ActionResult Index(int id)         {             return View();         }     }	[HandleError]     public class HomeController : Controller     {         public ActionResult Index(int? id)         {             return View();         }     }

 

 

Hope this helps.

 

 

 

Thanks & Regards,

Arun Manglick || Senior Tech Lead