qr code library c# The IIS 5.x and IIS 6.x Pipeline in Visual C#.NET

Generating QR Code in Visual C#.NET The IIS 5.x and IIS 6.x Pipeline

The IIS 5.x and IIS 6.x Pipeline
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Once a request comes into the AppDomain managed by the ASP .NET runtime, ASP .NET uses the HttpWorkerRequest class to store the request information . Following that, the runtime wraps the request s information in a class named HttpContext . The HttpContext class includes all the information you d ever want to know about a request, including references to the
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2 ASP.NET Application Fundamentals
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current request s HttpRequest and HttpResponse objects . The runtime produces an instance of HttpApplication (if one is not already available), and then fires a number of applicationwide events (such as BeginRequest and AuthenticateRequest) . These events are also pumped through any HttpModules attached to the pipeline . Finally, ASP .NET figures out what kind of handler is required to handle the request, creates one, and asks the handler to process the request . After the handler deals with the request, ASP .NET fires a number of postprocessing events (such as EndRequest) through the HttpApplication object and the HttpModules . Figure 2-5 illustrates the structure of the ASP .NET pipeline inside the ASP .NET worker process using IIS 6 .x (the only difference from IIS 5 .x is the name of the worker process) .
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HttpContext HttpRuntime HttpApplicationFactory HttpRequest HttpWorkerRequest HttpResponse HttpSessionState HttpApplication HttpApplicationState HttpModule HttpModule HttpModule Handler HandlerFactory
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FIGURE .2-5 . Main components of the HTTP pipeline in ASP .NET .
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The IIS 7.x Integrated Pipeline
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The integrated IIS 7 .x pipeline is very similar to the ASP .NET HTTP pipeline that s been around since ASP .NET was first released (shown in Figure 2-5) . As you can see from earlier investigations using the IIS 7 .x management console, the IIS 7 .x integrated pipeline employs modules and handlers just like earlier versions of the ASP .NET HTTP pipeline did . However, whereas the ASP .NET HTTP pipeline runs entirely within the ASP .NET worker process, IIS 7 .x runs the pipeline as directed by IIS . The integrated pipeline in IIS 7 .x works in very much the same way as the ASP .NET pipeline, so the application-wide events exposed through the HttpApplication events work just as before (application-wide events are discussed in detail later) . When running your application through IIS 7 .x in Integrated mode, your request no longer passes through aspnet_isapi .dll . IIS 7 .x pushes the request through the modules and handlers directly .
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Part I Fundamentals
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Tapping the Pipeline
Although some of the parts in the pipeline are unavailable to you as a developer, several parts are available directly and provide a useful means of managing your request as it goes through the pipeline . The most important parts of the pipeline that you can touch include the HttpApplication, the HttpContext, the HttpModule, and the HttpHandler . The following sections supply some details about these critical sections in the HTTP request path .
The HttpApplication
At this point, you understand the nature of a Web application as being very different from that of a normal desktop application . The code that you re writing is responsible for returning some HTML response to a client . In many ways, the model relates back to the terminal mainframe model prevalent during the mid-1970s . In ASP .NET, the endpoint of a request is an implementation of IHttpHandler (even if that handler ultimately forms a Web page based on your ASP .NET Web Forms code) . HTTP handlers live for a very short period of time . They stick around long enough to handle a request, and then they disappear . For very simple applications, this model might be just fine . However, imagine the requirements of even a modest commercial-grade application . If all you had to work with was these ephemeral handlers, you d have no way to achieve application-wide functionality . For example, imagine you want to cache data to avoid round-trips to the database . You d need to store that data in a place where all the HTTP handlers could get to it . The HttpApplication class exists for that purpose to act as a rendezvous point for your request processing . During the lifetime of a Web application, the HttpApplication objects serve as places to hold application-wide data and handle application-side events .
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