Harish Understanding Aspnet
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Harish Understanding Aspnet

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Harish Understanding Aspnet Harish Understanding Aspnet Presentation Transcript

  • Harish Ranganathan Application Platform Evangelist Microsoft India
  • AGENDA • HTTP Runtime • HTTP Context • IIS & ASP.NET Relation • Global.asax • HTTP Modules • Page Framework • HTTP Handlers • Best Practices
  • HTTP Runtime • A low-level HTTP processing infrastructure • Logical replacement for ISAPI filters/extensions • Ability to add, replace, or remove core pieces of the product • Benefits: Built-in thread pool, asynchronous support, access to ASP.NET intrinsic objects
  • HTTP Runtime
  • Http Runtime
  • IIS-ASP.NET Relation w3wp.exe (IIS 6.0) http.sys (Kernel Mode)
  • IIS-ASP.NET Relation Document types are mapped to ISAPI extensions in the IIS Manager
  • IIS – ASP.NET Relation
  • HTTP Pipeline HTTP IIS aspnet_isapi HttpModules HttpHandler Request
  • HTTP Modules • Called before and after the handler executes • Ability to intercept, participate or modify each individual request into an application Ex: Changing URL in request/response to hide server names behind firewall. • The HTTP Application provides several events that modules can synchronize with
  • HTTP Modules • Global Application Events: – Start – End • Per request events (in order): – BeginRequest – PreRequestHandlerExecute – AuthenticateRequest – PostRequestHandlerExecute – AuthorizeRequest – ReleaseRequestState – ResolveRequestCache – UpdateRequestCache – AcquireRequestState – EndRequest • Per request events (non-deterministic): – PreSendRequestHeaders – PreSendRequestContent – Error
  • HTTP Modules Built-In HTTP Modules: • Authentication Modules • Authorization Modules • OutputCache Module • SessionState Module • Configuring HTTP Modules – Use httpModules section handler • View the Machine.Config
  • HTTP Handlers • Handlers: – Are the endpoint in the request process – Only one handler is invoked per request • Examples – ASP.NET Page Handler: • Implements the ASP.NET Page Framework • Processes all requests for .aspx pages – ASP.NET Service Handler: • Implements Web Services • Processes all requests for .asmx pages • Configuring HTTP Handlers
  • HTTP Handlers & Modules
  • HTTP Context • Encapsulates all information about an individual HTTP request • ASP.NET intrinsic objects are exposed as properties of the HttpContext • Modules and Handlers get a reference to an HttpContext object representing the current request • Flows through the lifetime of a request
  • HTTP Context • ASP.NET supports all ASP classic members Property Managed Class – Request HttpRequest – Response HttpResponse – Server HttpServerUtility – Session HttpSessionState – Application HttpApplicationState • ASP.NET adds several new and useful members – Request.Files – Response.Cache – Error/User/Trace
  • Global.asax • Extends on the familiar functionality of the Global.asa • Global.asax must be located in the root of a Web application • Enables easy handling of Application level events without a custom HttpModule
  • Global.asax Updates: • Are automatically detected • Causes the Global.asax to be recompiled • Restarts the HTTP Application • ASP.NET completes all current requests before shutting down old application • Fires Application_End event • Shuts down App Domain
  • HTTP Context & Global.asax
  • Page Framework • Overview • Page Object • Page Lifecycle • Page Events • Control Tree • Page Directives
  • Page Framework Page Object: • Inherits from Control, implements IHttpHandler • All .aspx pages inherit from Page • Exposes the ASP.NET intrinsics • Wires up events (Page_Load, Page_Init…)
  • Page Framework Init Page Lifecycle: LoadViewState Constructor PostBack Data Processing Load ProcessRequest (hidden from user) PostBack Change Notification PostBack Event Handling PreRender SaveViewState Render Dispose
  • Page Framework
  • Best Practices • Return Multiple Resultsets • Paged Data Access • Connection Pooling • ASP.NET Cache API • Per Request caching • Background Processing
  • Best Practices • Page Output Caching and Proxy Servers • Session State & Viewstate • Debug vs. Release • Exception Handling
  • Related Content Breakout Sessions (session codes and titles) Interactive Theater Sessions (session codes and titles) Hands-on Labs (session codes and titles) Hands-on Labs (session codes and titles)
  • Track Resources Resource 1 Resource 2 Resource 3 Resource 4
  • © 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.