CTTDNUG ASP.NET MVC

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Introduction to ASP.NET MVC Barry Gervin, Partner [email protected] @bgervin ObjectSharp.com/blogs/Barry

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CTTDNUG ASP.NET MVC

Transcript of CTTDNUG ASP.NET MVC

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Introduction to ASP.NET MVCBarry Gervin, [email protected]@bgervinObjectSharp.com/blogs/Barry

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Objectives

• Why do we need something else?– What’s wrong with Web Forms?

• “How To” build ASP.NET MVC– How does this compare? Help?

• What should I beware of?

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Agenda

• WebForms• MVC• ASP.NET MVC– Tenets

• WebForms Vs. MVC• Walkthrough Real Application• Testing MVC• Extensibility

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ASP.NET WEB FORMS

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ASP.NET Then…

CachingCaching ModulesModules

HandlersHandlersIntrinsicsIntrinsics

PagesPages ControlsControls

GlobalizationGlobalization

ProfileProfile

Master PagesMaster Pages

MembershipMembershipRolesRoles

Etc.Etc.

ASP.NET

One web applicationframework to rule them all…

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WebFormsASPX Page

User/Custom/ServerControls

Master Page

User/Custom/ServerControls

Model

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QUICK DEMOPages, Events and Postbacks

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Page Controller

ASPX Page

ASP.NET

Response

Request

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Master Page

Control

Control

No real role responsibility…

UIPresentation LogicBusiness LogicData Access

Who does what?How and when?

Control

ControlPage

Control

Control

Control

Control

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Control abstractions can be negative…

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It isn't easy enough to test…It isn't easy enough to test…

Logic UI

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WebForms are great, but options are

good…

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ASP.NET MVC

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ASP.NET Now…

ASP.NETDynamic Data

ASP.NETWebForms

ASP.NETMVC

Presentation

RuntimeASP.NET

Core

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So how does ASP.NET MVC

differ?

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MVC = Model-View-Controller

ControllerController(Input)(Input)

ModelModel(Logic)(Logic)

ViewView(Presentation)(Presentation)

Separation of concerns!

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ASP.NET MVC

Model

ASPX Page

User/Custom/ServerControls

Master Page

User/Custom/ServerControls

Controller

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How does MVC look?

Request

View

Controller

Response

ControllerHandles input(HTTP requests)

ViewVisually representsthe model

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Framework Goals

• Alternative

• Frictionless Testability

• Tight control over <markup>

• Leverage the benefits of ASP.NET

• Routable Urls to Controllers to Views

• Conventions and guidance

• Modular and Extensible

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Project Structure

Routes

Views/Master

Views/Master

Models

Controllers

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ASP.NET MVC DEMORoutes, Controllers & Views

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ASP.NET MVC doesn’t have…

• Postbacks• View state• Control state• Server-side form• Page/Control lifecycle

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ASP.NET MVC still has…• Web designer• Master pages• User controls• Membership/Roles/Profile• Globalization• Caching• HTTP intrinsics:– HttpContext– HttpRequest– HttpResponse– Etc.

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Routing

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mysite.com/object/action/parameter

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Clean URLs

Don’t settle for…

/Products.aspx?CategoryID=123

When you can easily have…

/Product/Puppies

Or whatever else makes sense…

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protected void Application_Start(object sender, EventArgs e) {

RouteTable.Routes.Add("SearchRoute", new Route("search/{searchterm}", new WebFormRouteHandler("~/search.aspx")));

RouteTable.Routes.Add("UserRoute", new Route("users/{username}", new WebFormRouteHandler("~/users.aspx")));

} .... protected void Page_Load(object sender, EventArgs e) {

string searchterm= Page.RouteData.Values["searchterm"] as string; Response.Write(searchterm); }... <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="<%$RouteUrl:SearchTerm=Bob%>">Link to search</asp:HyperLink>

Routing

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Controller Conventions• Controller– Must…

• Be suffixed with “Controller”• Implement IController (or inherit from Controller)

• Action– Must…

• Be Public• Return ActionResult or void

– Can’t…• Be generic• Have a NonActionAttribute• Have out/ref parameters

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REAL WORLD WALKTHROUGHSayITFirst.ca

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Extensibility Pipeline

ControllerBuilder

ControllerFactory

Controller

ViewEngine

ViewLocator

View

ControllerActionInvoker

ActionResult*

ActionFilters

* ViewResult

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Action Results

• ActionResult– ContentResult– EmptyResult– JsonResult– RedirectResult– RedirectToRouteResult– ViewResult

ControllerController

ActionInvoker

ActionResult

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Action Filters• IActionFilter– Controller– ActionFilterAttribute

1. OnActionExecuting2. [Action Method Executed]3. OnActionExecuted4. OnResultExecuting5. [Action Result Executed]6. OnResultExecuted

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Controller Factory

• IControllerFactory– DefaultControllerFactory

ControllerBuilder

ControllerFactory

Controller

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View Engine

• IViewEngine– WebFormViewEngine

• IViewLocator– ViewLocator

• WebFormViewLocator

ViewEngine

ViewLocator

ViewActionResult*

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ASP.NET MVC 2

• A good number of new features including:– Client-side validation based on the model’s

validation metadata– Areas to better organize an application– Model validation providers to hook in alternative

validation logic when model binding– Metadata providers to allow for alternative

sources of metadata for model objects

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Microsoft.com/web

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Web Platform Installer

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NerdDinner (nerddinner.com)

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Professional ASP.NET MVC 1.0,

a.k.a. The “Gang of Foreheads” Book

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ASP.NET MVC in Action

@ManningBooks

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Pro ASP.NET MVC Framework

(Highest rating on Amazon.com)

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The Official ASP.NET MVC SiteASP.NET/MVC

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You’ve Been Haacked (Phil Haack) Haacked.com

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Scott Hanselman’s BlogHanselman.com

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ObjectSharp.com

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ResourcesMicrosoft Starting Points•http://microsoft.com/web•http://asp.net/mvc•http://codeplex.com/MVCContrib•http://aspnet.codeplex.com

Community Starting Points•http://channel9.msdn.com/tags/asp.net+mvc•http://haacked.com/•http://stackoverflow.com

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Summary

• Web Forms vs. MVC• 101 How-To• Real World ASP.NET MVC• Testability