Inside ASP.NET MVC framework

Inside ASP.NET MVC framework

Alexander Beletsky, E-conomichttp://beletsky.net

@alexbeletsky

ASP.NET MVC is cool!Why?

Hey, it's open source

• See what happens behind the curtain• Improve your knowledge• Learn from best• Super fun

ASP.NET or ASP.NET MVC  ?

Have you heard such question?

ASP.NET is foundation

• Request processing engine• Pushing request thought pipeline• Pipeline consists of Modules• And ends with Handler

MvcHanlder - heart of ASP.NET MVC

• Implements IHttpAsyncHandler, IHttpHandler• Creates the ControllerFactory• Execute the controller

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Who is responsible for calling MvcHander?

Here comes Routing

• Included in framework 3.5 SP1• Implements recomendations by Jakob Nielsen• Save us of URL re-writing module• Provides decoupling of URL and page

Route = URL + Constraints + IRouteHanlder

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ControllerBuilder & ControllerFactory

• ControllerBuilder creates ControllerFactory• ControllerFactory creates Controller

Difference in MVC2  and MVC3

• MVC2 ControllerBuilder creates factory "directly"• MVC3 ControllerBuilder uses SingleServiceResolver• SingleServiceResolver depends on IDependencyResolver

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IDependencyResolver

• Bridge between ASP.NET MVC and IoC container• Very simple interface• Introduce extensibility for many entities

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Controller Execution

• Get the name of the Action from Route• Call ControllerActionInvoker to Invoke action

Filters

• Authorization filters – Implements the IAuthorizationFilter attribute.

• Action filters – Implements the IActionFilter attribute.• Result filters – Implements the IResultFilter attribute.• Exception filters – Implements the IExceptionFilter attribute.

Why use filters?

• DRY code• AOP principles in action• Better reuse• Clean code• MVC3 introduces global filters

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Action Results

• ViewResult - Represents HTML and markup.• EmptyResult - Represents no result.• RedirectResult - Represents a redirection to a new URL.• JsonResult - Represents a JavaScript Object Notation result

that can be used in an AJAX application.• JavaScriptResult - Represents a JavaScript script.• ContentResult - Represents a text result.• FileContentResult - Represents a downloadable file (with

the binary content).• FilePathResult - Represents a downloadable file (with a

path).• FileStreamResult - Represents a downloadable file (with a

file stream).

Action Result rendering

• Extract view name from Route• Find view associated with with Route & Action Result• Render the view

THANK YOU!

http://www.beletsky.net/search/label/InsideMVCtwitter: @alexbeletsky