Inside ASP.NET MVC Framework

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Inside ASP.NET MVC framework Alexander Beletsky, E-conomic http://beletsky.net @alexbeletsky

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ASP.NET MVC is cool! Why?

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Hey, it's open source ● See what happens behind the curtain ● Improve your knowledge ● Learn from best ● Super fun

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ASP.NET or ASP.NET MVC ? Have you heard such question?

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ASP.NET is foundation ● Request processing engine ● Pushing request thought pipeline ● Pipeline consists of Modules ● And ends with Handler

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MvcHanlder - heart of ASP.NET MVC ● Implements IHttpAsyncHandler, IHttpHandler ● Creates the ControllerFactory ● Execute the controller

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Show me the code

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Who is responsible for calling MvcHander?

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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

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Route = URL + Constraints + IRouteHanlder

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Show me the code

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ControllerBuilder & ControllerFactory ● ControllerBuilder creates ControllerFactory ● ControllerFactory creates Controller

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Difference in MVC2 and MVC3 ● MVC2 ControllerBuilder creates factory "directly" ● MVC3 ControllerBuilder uses SingleServiceResolver ● SingleServiceResolver depends on IDependencyResolver

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Show me the code

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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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Show me the code

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Controller Execution ● Get the name of the Action from Route ● Call ControllerActionInvoker to Invoke action

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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.

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Why use filters? ● DRY code ● AOP principles in action ● Better reuse ● Clean code ● MVC3 introduces global filters

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Show me the code

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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).

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

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THANK YOU! http://www.beletsky.net/search/label/InsideMVC twitter: @alexbeletsky