Sunday, 23 February 2014

Areas in MVC



Areas was introduced in Asp.net MVC2 which allows us to organize models, views, and controllers into separate functional sections of the application, such as administration, billing, customer support, and so on. This is very helpful in a large web application, where all the controllers, views, and models have a single set of folders and that become difficult to manage.
Each MVC area has its own folder structure which allows us to keep separate controllers, views, and models. This also helps the multiple developers to work on the same web application without interfere to one another.

Registering Area
Before working with area, make sure you have registered your area with in the Application_Start method in Global.asax as shown below.
protected void Application_Start()
{
   //Register all application Areas
   AreaRegistration.RegisterAllAreas();

   WebApiConfig.Register(GlobalConfiguration.Configuration);
   FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
   RouteConfig.RegisterRoutes(RouteTable.Routes);
   BundleConfig.RegisterBundles(BundleTable.Bundles); 
}

Note: Always remember the order of registering the Areas must be on top, so that all of the settings, filters and routes registered for the applications will also apply on the Areas.

Creating Area
To add an area to an MVC application, right-click on the project item with in the Solution Explorer window and select Add>Area option as shown below.

Now a new prompt will appear, within give the name of the area like "Department" and click Add button. Now the new Department Area has been created as shown in below fig.
 
Now you have seen DepartmentAreaRegistration class has been created and in the RegisterArea method, a route for the area has been defined as shown below.
using System.Web.Mvc;

namespace Mvc4Area.Areas.Department
{
   public class DepartmentAreaRegistration : AreaRegistration
   {
      public override string AreaName
     {
        get { return "Department"; }
     }

     public override void RegisterArea(AreaRegistrationContext context)
    {
        context.MapRoute(
                 "Department_default",
                  "Department/{controller}/{action}/{id}",
                  new { action = "Index", id = UrlParameter.Optional }
                                );
     }
   }
}


Populating Area
Now you can create controllers, views, and models in the Department area like as below.





 
 

How to see view with in Areas
Now, let's see how to view your Index view with the help of Page Inspector as shown below.


 


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