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2 ASP.NET Application Fundamentals
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Marking the <script> tag containing the ShowLineage method with the runat=server attribute causes ASP .NET to execute the code on the server . But although classic ASP interprets the script block using the designated script language, ASP .NET has an entirely different execution model the whole page is actually compiled into a class that runs under the Common Language Runtime (CLR) . Here s how the ASP .NET compilation model works .
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A Trip Through the ASP.NET Architecture
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When it arrives on the Web server, the HTTP request/response is routed through many server-side objects for processing . Once a request ends up at the server, it winds its way through the IIS/ASP .NET pipeline . The best way to understand the path of an HTTP request through ASP .NET is to follow a request as it originates in the browser and is intercepted by Internet Information Services and your Web application . When an end user presses the Return key after typing in a URL, the browser sends an HTTP GET request to the target site . The request travels through a series of routers until it finally hits your Web server and is picked up on port 80 . If your system has software listening to port 80, the software can handle the request . On the Microsoft platform, the software most often listening to port 80 is IIS . For the time being, ASP .NET works with three versions of IIS: version 5 .x (if you are using the Windows XP Professional operating system), version 6 .x (if you are using the Windows Server 2003 operating system), and version 7 .x (if you are using the Windows Vista, Windows 7, or Windows Server 2008 operating systems) .
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The general flow of the requests is the same, regardless of which version of IIS you choose . IIS maintains a mapping between file extensions and binary components capable of interpreting the request (you see more about the binary components later) . When a request comes in, IIS reads the file name identified in the request and routes the request to the appropriate component . Earlier versions of IIS (prior to version 7 .x) implement such features as client authentication and output caching independently of ASP .NET . That is, IIS and ASP .NET each implement their own versions of these features . IIS 7 .x integrates the ASP .NET versions of these features (some of which you see in future chapters) . As far as the ramifications of IIS 7 .x to ASP .NET developers, running in Integrated mode makes .NET functionality part of the core pipeline . Features such as Forms Authentication can now be applied to a wide range of content not just ASP .NET forms . For example, this helps when trying to secure an entire Web site using a uniform authentication method . For the purposes of illustration, the following graphics show how IIS 7 .x routes requests of various types . The following shows the IIS 7 .x module mappings when running in Integrated mode:
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2 ASP.NET Application Fundamentals
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Also for illustration purposes, the following shows IIS 7 .x handler mappings when running in Integrated mode:
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In addition to running in Integrated mode, IIS 7 .x also runs in Classic mode to support backward compatibility . When running in Classic mode, IIS 7 .x uses the module and handler architecture to pass processing to specific traditional binary components (that is, ISAPI DLLs) . To illustrate how mappings work in Classic mode, the following graphic shows IIS 7 .x module mappings running in Classic mode:
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The following graphic shows IIS 7 .x running in Classic mode and its handlers mappings:
Once IIS intercepts the request and maps it to the worker process, the request follows a very specific path through the pipeline . Later sections in look at each part of the pipeline in more detail . The outline of the request s path through versions of IIS earlier than 7 .x is this: . . . . . . . 1 . . The request lands in IIS . 2 . . IIS routes the request to aspnet_isapi .dll . a . . If IIS 5 .x is running, IIS asp_isapi .dll routes the request through a pipe to aspnet_wp .exe . b . . If IIS 6 .x is running, the request is already in the worker process . 3 . . ASP .NET packages the request context into an instance of HttpContext . 4 . . ASP .NET pipes the request through an instance of an HttpApplication object (or an HttpApplication-derived object) . 5 . . If the application object is interested in receiving any of the request preprocessing events, HttpApplication fires the events to the application object . Any HttpModules that have subscribed to these events will receive the notifications as well . 6 . . Runtime instantiates a handler and handles the request . Figure 2-1 shows how IIS version 5 .x and ASP .NET work together to handle HTTP requests . Figure 2-2 shows how IIS version 6 .x works with ASP .NET to handle requests .
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