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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through } version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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Finally, we are ready to build the asynchronous handler class itself This class, which we just call This book begins must a discussion ofthe methods of the IHttpAsyncHandler interface shown earlier, how AsyncHandler, with implement all the rationale behind the design of ASPNET and an introduction to it builds on top of the NET framework Subsequent chapters exploreProcessRequest method is not used which derives from IHttpHandler, for a total of four methods The the host of new features in ASPNET, including the server-side because we implement BeginProcessRequest In BeginProcessRequest, we and will never be called, compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the with the HttpContext object, the create a new instance of our AsyncRequestState class, initializing it book, working examples illustrate best practices for delegate,Web-based applications reference passed in as parameters We then prepare a AsyncCallback building and the generic object in C# newAsyncRequest object, initialized with the freshly created AsyncRequestState object, and launch a Among the topics explored in depth are: new thread Our implementation of EndProcessRequest does not do anything in this example, but it can be used in general to perform any cleanup or last-minute response additions The AsyncHandler class definition is shown in Listing 4-27 ASPNET architecture Listing 4-27 The AsyncHandler Class Definition Web forms
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public class AsyncHandler : IHttpAsyncHandler HTTP pipeline { public void ProcessRequest(HttpContext ctx) { Diagnostics and error handling // not used Validation } public bool IsReusable { Custom controls get { return false;} } Caching
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State management public IAsyncResult BeginProcessRequest(HttpContext ctx, AsyncCallback cb, Data binding
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object obj) [ Team LiB ] { AsyncRequestState reqState = new AsyncRequestState(ctx, cb, obj); AsyncRequest ar = new AsyncRequest(reqState); ThreadStart ts = new ThreadStart(arProcessRequest); Thread t = new Thread(ts); tStart(); return reqState; } public void EndProcessRequest(IAsyncResult ar) { // This will be called on our manually created thread Table of Contents // in response to our calling ASPNET's AsyncCallback // delegate once with Examples in C# Essential ASPNET our request has completed processing // The ByFritz Onion incoming // IAsyncResult parameter will be a reference to the // AsyncRequestState class we built, so we can access Publisher : Addison Wesley // the Context through that class if we like Pub Date : February // Note - you11, 2003 *cannot* access the current context ISBN // using the HttpContextCurrent property, because we : 0-201-76040-1 Pages// are432 : running on our own thread, which has not been // initialized with a context reference AsyncRequestState ars = ar as AsyncRequestState; if (ars != null) "This { well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its// here captures the perform some ASPNET and walks the reader to a high level of technical and pages It you could true essence of cleanup, write // something else to Director of Software do whatever architectural skill"-J Fred Maples, the Response, or Engineering, NASDAQcom // else you needed Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through } version 11 It provides experienced programmers with the information needed to fully understand the } technology, and is a clear guide to using ASPNET to build robust and well architected Web applications }
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new handlers), it will If we now build this handler and register it as an endpoint (as we did with our earlier features in ASPNET, including theprocess requests asynchronouslycode-behind classes, server-side of ASPNET Figure 4-6 shows successfully server-side compilation model, from the calling request thread controls, form validation, the data binding model, and custom controlwhen a requestThroughout the book, working examples illustrate the sequence of events that take place development mapped onto our asynchronous handler is made best practices for building Web-based applications in C# First, the application class notices that our handler implements IHttpAsyncHandler, so instead of calling the synchronous ProcessRequest method, it invokes BeginProcessRequest on our handler, passing in Among the topics explored in depth are: callback delegate for our handler to invoke when it is complete the current context and an asynchronous Our handler then creates a new AsyncRequestState object, initialized with the parameters passed into BeginProcessRequest Next, our handler creates a new AsyncRequest object, initialized with the ASPNET architecture AsyncRequestState object, and launches a new thread using the AsyncRequestProcessRequest method as the entry point Our handler then returns the AsyncRequestState object to the application Web forms object, and the calling thread is returned to the thread pool while our hand-created thread continues processing the request Configuration
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