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Asp .net MVC 5 Features-Attribute based routing



Attribute based routing in MVC 5


we can define the route in the same place where action method is defined
Here we specified the route for the controller GetElectronicItems


[Route("Products/Electronics/{id}")]
     public ActionResult GetElectronicItems(string id)
     {
         ViewBag.Id = id;
          return View();
     }

To enable attribute based routing in RouteConfig.cs we need to add  the following in the RouteConfig file.

public static void RegisterRoutes(RouteCollection routes)
       {
           routes.MapMvcAttributeRoutes();
       }


Optional Parameter

We can also specify if there is any optional parameter in the URL pattern defined by the Route attribute with the “?” character.
[Route("Products/Electronics/{id?}")]
      public ActionResult GetElectronicItems(int? id) {
          ViewBag.Id = id; return View();
      }

Route constraints

We can specify the constraints like if parameter is int or string

[Route("Products/Electronics/{id:int}")]

Route Prefix

If we have multiple action methods in a controller all using the same prefix we can use RoutePrefix attribute on the controller instead of putting that prefix on every action method.
Like we can attach the following attribute on the controller
[RoutePrefix("Products")]
So now our Route attribute on our action method does not need to specify the common prefix

[Route("Electronics/{id}")]

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