ton asp connections ams304 mvc

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AMS304: Introduction to the

ASP.NET Model View Controller (MVC) Framework

Scott Hanselman Eilon Lipton

Microsoft [email protected] [email protected]



INTRO

MVC



Goodness

Maintain Clean Separation of ConcernsEasy Testing

Red/Green TDDHighly maintainable applications by default

Extensible and Pluggable

Support replacing any component of thesystem



Goodness

Enable clean URLs and HTMLSEO and REST friendly URL structures

Great integration within ASP.NETSupport both static and dynamic languages



What¶ s th e Poin t?

This is not Web Forms 4.0It¶s about alternatives. Car vs. Motorcycle.

Simple or as complex as you likeExtend it, add IOC. Or not. If the shoe pinches, don¶twear it.

Fundamental

Part of System.Web and isn¶t going anywhere.Plays Well With Others

Feel free to use NHibernate for Models, Brail for Views and Whatever for Controllers. Be Happy.



A Littl e M ore De ta il

ModelModel

Controller Controller ViewView

Browser requests /Products/Route is determinedController is activated

Method on Controller is invokeController does some stuff Renders View, passing in

custom ViewDataURLs are rendered,pointing to other Controllers



Ev en M ore De ta il ± R eques t F low

Y ou can futz at each stepin the process

R eques t R eques t

URLURLRoutingRouting

RouteRoute RouteRouteHandler Handler

HttpHttpHandler Handler Controller Controller

ViewViewFactoryFactory ViewView

R esponseR esponse



Demo ± He lloMVC

Wor ldDon¶t fall asleep, it¶ll be worth it.



HO W IT WORKS

MVC



B a sic C on tro ller H a nd ling

Scenarios, Goals and DesignURLs route to controller ³actions´, not pages ±mark actions in Controller.

Controller executes logic, chooses view.[ControllerAction]public void ShowPost(int id) {

Post p = PostRepository.GetPostById(id);

if (p != null) {RenderView("showpost", p);} else {

RenderView("nosuchpost", id);}

}



B a sic V iews

Scenarios, Goals and Design: Are for rendering/output.

Pre-defined and extensible rendering helpers

Can use .ASPX, .ASCX, .MASTER, etc.Can replace with other view technologies:

Template engines (NVelocity, Brail, «).Output formats (images, RSS, JSON, «).Mock out for testing.

Controller sets data on the ViewLoosely typed or strongly typed data



U R L R ou ting ± Pre tty U RI sDevelopers adds Routes to a global RouteTableMapping creates a RouteData - a bag of key/values

protected void Application_Start(object sender, EventArgs e){

RouteTable.Routes.Add(new Route {Url = "Blog/bydate/[year]/[month]/[day]",Defaults = new { controller="blog", action="showposts" },Validation = new { year=@"\d{1,4}", month= @"\d{1,2}",

day = @"\d{1,2}"} });

RouteTable.Routes.Add(new Route {Url = "[controller]/[action]/[id]",RouteHandler = typeof(MvcRouteHandler) });

}



Demo ±R

ou tingThe route less travelled«



HO W TO T E ST IT

MVC



In terf a ces a nd T DD

Mockable IntrinsicsIHttpContext, IHttpResponse, IHttpRequest

ExtensibilityIController IControllerFactoryIRouteHandler IViewIViewFactory



T es ting C on tro ller A c tions

No requirement to mock out full ASP.NET runtime.[TestMethod]public void ShowPostsDisplayPostView() {

TestPostRepository repository = new TestPostRepository();TestViewFactory viewFactory = new TestViewFactory();

BlogController controller = new BlogController( );controller.ShowPost(2);

Assert.AreEqual("showpost", viewFactory.LastRequestedView);Assert.IsTrue(repository.GetPostByIdWasCalled);

Assert.AreEqual(2, repository.LastRequestedPostId);}



C on tro ller F a c tor y

Scenarios, Goals and Design:Hook creation of controller instance

Dependency Injection.Object Interception.

public interface IControllerFactory {IController CreateController(IHttpContext context,

RouteData routeData,Type controllerType);

}

protected void Application_Start(object s, EventArgs e) {ControllerBuilder.Current.SetDefaultControllerFactory(

typeof(MyControllerFactory));}



V iew F a c tor y

Scenarios, Goals and Design:Mock out views for testingReplace ASPX with other technologies

public interface IViewFactory {IView CreateView(IHttpContext context,

RouteData routeData,string viewName, string layoutName,object viewData);

}

Inside controller class:ViewFactory = new XmlViewFactory(...);

RenderView("foo", myData);



Demo ±T

DDWasn¶t this demo technically

supposed to be first?



Demo ± D yn a mic D ata C on tro ls

Not DDE. Scared you, didn¶t I?



Demo ±Im a geGenIt¶s your thing.

Do what you wanna do.



Demo ± R ub y V iew E ngine& P yth on C on tro ller

It¶s a kinder, gentler Microsoft.No seriously. Hug?



Demo ± XM

L-R

PC

SOAP is for dorks.



C onc lusion

This is not Web Forms 4.0It¶s about alternatives. Car vs. Motorcycle.

Simple or as complex as you likeExtend it, add IOC. Or not. If the shoe pinches, don¶twear it.

Fundamental

Part of System.Web and isn¶t going anywhere.Plays Well With Others

Feel free to use NHibernate for Models, Brail for Views and VB for Controllers. Be Happy.



Y our Feedb a ck is Impor ta n t

Please fill out a session evaluation form andeither put them in the basket near the exit

or drop them off at the conferenceregistration desk.

Thank you!

ton asp connections ams304 mvc

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