asp.net mvc getting started with this framework

1。asp.net mvc URL routing

• IIS determines the request should be handled by ASP.NET
• The MvcHandler uses IControllerFactory to obtain an instance of IController using the "controller" route data from the route {controller}/{action}/{id}.

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

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

        }

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

            RegisterRoutes(RouteTable.Routes);
        }

• The HomeController is found, and its Execute method is invoked
• The HomeController invokes the Index action
• The Index action adds some objects to the ViewData dictionary

        public ActionResult Index()
        {
            ViewData["Message"] = "Welcome to ASP.NET MVC!";

            return View();
        }

• ASP.NET renders the response to the browser.

  <h2><%= Html.Encode(ViewData["Message"]) %></h2>

2.Controller两种形式

        public ActionResult Index()
        {
            ViewData.Add("text", "Hello World2");

            return View();
        }

<h2><%=ViewData["text"]%></h2>

        public ActionResult Index()
        {
            return View((object)"Hello World3");
        }

 <h2><%=Model %> I'm strongly typed in a layout.</h2>