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16 The HTTP Request Context
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16. PostReleaseRequestState The state, as modified by the page execution, has been persisted. Any relevant response filtering is done at this point. (I ll say more about this topic later.) 17. UpdateRequestCache The ASP.NET runtime determines whether the generated output, now also properly filtered by registered modules, should be cached to be reused with upcoming identical requests. 18. PostUpdateRequestCache configured to do so. The page has been saved to the output cache if it was
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19. LogRequest The event indicates that the runtime is ready to log the results of the request. Logging is guaranteed to execute even if errors occur. 20. PostLogRequest The request has been logged. 21. EndRequest This event fires as the final step of the HTTP pipeline. Control passes back to the HttpRuntime object, which is responsible for the actual forwarding of the response to the client. At this point, the text has not been sent yet. If an unhandled error occurs at any point during the processing, it is treated using the code (if any) associated with the Error event. As mentioned, events can be handled in HTTP modules as well as in global.asax. Note The Error event provides a centralized console for capturing any unhandled exception in order to recover gracefully or just to capture the state of the application and log it. By writing an HTTP module that just intercepts the Error event, you have a simple but terribly effective and reusable mechanism for error handling and logging. At the end of the day, this is the core of the engine of popular tools for ASP.NET error handling, logging, and reporting ELMAH.
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The global.asax File
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The global.asax file is used by Web applications to handle some application-level events raised by the ASP.NET runtime or by registered HTTP modules. The global.asax file is optional. If it is missing, the ASP.NET runtime environment simply assumes you have no application or module event handlers defined. To be functional, the global.asax file must be located in the root directory of the application. Only one global.asax file per application is accepted. Any global.asax files placed in subdirectories are simply ignored. Note that Microsoft Visual Studio doesn t list global.asax in the items you can add to the project if there already is one.
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Part IV
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Infrastructure of the Application
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Compiling global.asax
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When the application is started, global.asax, if present, is parsed into a source class and compiled. The resultant assembly is created in the temporary directory just as any other dynamically generated assembly would be. The following listing shows the skeleton of the C# code that ASP.NET generates for any global.asax file:
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namespace ASP { public class global_asax : System.Web.HttpApplication { // // The source code of the "global.asax" file is flushed // here verbatim. For this reason, the following code // in global.asax would generate a compile error. // int i; // i = 2; // can t have statements outside methods // } }
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The class is named ASP.global_asax and is derived from the HttpApplication base class. In most cases, you deploy global.asax as a separate text file; however, you can also write it as a class and compile it either in a separate assembly or within your project s assembly. The class source code must follow the outline shown earlier and, above all, must derive from HttpApplication. The assembly with the compiled version of global.asax must be deployed in the application s Bin subdirectory. Note, though, that even if you isolate the logic of the global.asax file in a precompiled assembly, you still need to have a (codeless) global.asax file that refers to the assembly, as shown in the following code:
<%@ Application Inherits="MyApp.Global" %>
You ll learn more about the syntax of global.asax in the next section, Syntax of global.asax. With a precompiled global application file, you certainly don t risk exposing your source code over the Web to malicious attacks. However, even if you leave it as source code, you re somewhat safe. The global.asax file, in fact, is configured so that any direct URL request for it is automatically rejected by Internet Information Services (IIS). In this way, external users cannot download or view the code it contains. The trick that enables this behavior is the following line of code, excerpted from machine.config:
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