Basics of ASP.NET MVC 3: Part-III (Dependency Injection)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using Microsoft.Practices.Unity;
using MVC3Demo.Models;
using MVC3Demo.Controllers;
using MVC3Demo.Factories;

namespace MVC3Demo
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
    // visit http://go.microsoft.com/?LinkId=9394801

    public class MvcApplication : System.Web.HttpApplication
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
        }

        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Product", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );

        }

        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            RegisterGlobalFilters(GlobalFilters.Filters);
            RegisterRoutes(RouteTable.Routes);
            RegisterType();
        }
        private void RegisterType()
        {
            UnityContainer container = new UnityContainer();
            container.RegisterType<IProductModel, ProductModel>();
            container.RegisterType<IController, ProductController>("Product");

            UnityControllerFactory factory = new UnityControllerFactory(container);

            ControllerBuilder.Current.SetControllerFactory(factory);

        }
    }
}