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In ourValidation we store a reference to the HttpContext object associated with this request, a reference example, to the AsyncCallback delegate passed into BeginProcessRequest (which we must later invoke to Data binding complete the request), and a generic object reference for extra data that may be used by the caller of BeginProcessRequest The other element that must be implemented in this class is a synchronization Custom controls object that threads can wait on to be signaled when the operation completes We use the common technique of supplying a ManualResetEvent that fires when our request is complete, but we allocate it Caching only if someone requests it Finally, our class has a convenience method called CompleteRequest that triggers the management State Manual ResetEvent if it was created, invokes the AsyncCallback delegate, and sets our IsCompleted flag to true The complete class definition for AsyncRequestState is shown in Listing 4-25
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Listing LiB ] [ Team 4-25 The AsyncRequestState Class Definition
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class AsyncRequestState : IAsyncResult { public AsyncRequestState(HttpContext ctx, AsyncCallback cb, object extraData ) { _ctx = ctx; _cb = cb; _extraData = extraData; } internal HttpContext _ctx; Table of Contents internal AsyncCallback _cb; internal object _extraData; Essential ASPNET with Examples in C# private ByFritz Onion bool _isCompleted = false; private ManualResetEvent _callCompleteEvent = null;
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Publisher Pub Date : Addison Wesley
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internal void CompleteRequest() : February 11, 2003 { ISBN : 0-201-76040-1 _isCompleted = true; Pages lock : 432 (this) { if (_callCompleteEvent != null) _callCompleteEventSet(); "This } well-conceived and well-written book has extensive knowledge and priceless experience overflowing from // pages callback was true essence of ASPNET and now the reader to a high level of technical and its if a It captures the registered, invoke it walks architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom if (_cb != null) _cb(this); Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through }
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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 // IAsyncResult interface property implementations This book begins with a discussion of the } } rationale behind the design of ASPNET and an introduction to how { get { return(_extraData); it builds on bool CompletedSynchronously top of the NET framework Subsequent chapters explore the host of new features in ASPNET, public including the return(false); { get { server-side compilation model,}code-behind classes, server-side controls, form validation, the } data binding model, and custom control development Throughout the book, working examples illustrate public bool IsCompleted best practices for building Web-based applications in C# { get { return(_isCompleted); } } Among the topics explored in depth are:
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public WaitHandle AsyncWaitHandle { get { ASPNET architecture lock( this ) { Web forms if( _callCompleteEvent == null ) _callCompleteEvent = new ManualResetEvent(false); Configuration
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The next step is to spawn a new thread on which we will process our request The method we call on this Custom controls new thread will need access to the state we cached in the AsyncRequestState class shown in Listing 4-25, but unfortunately the ThreadStart delegate used to spawn new threads in NET does not take any Caching parameters To get around this, we create another class with the necessary state cached as data members (in this case, simply a reference to the AsyncRequestState object for this request) and with an instance State management method that can be used to initialize the ThreadStart delegate Listing 4-26 shows the definition of this class, called AsyncRequest Note that the ProcessRequest method we define in this class is the method
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that will be ] [ Team LiBcalled from our manually created thread, and when it completes, it signals that the request processing is complete by invoking CompleteRequest on the AsyncRequestState object Listing 4-26 The AsyncRequest Class Definition
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class AsyncRequest { private AsyncRequestState _asyncRequestState; public AsyncRequest(AsyncRequestState ars) { _asyncRequestState = ars; }
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public void ProcessRequest() Essential ASPNET with Examples in C# { ByFritz Onion // This is where your non-CPU-bound // activity would take place, like accessing a Web // Publisher service, polling a slow piece of hardware, or : Addison Wesley // performing11, 2003 a lengthy database operation Pub Date : February // We put the thread to sleep for 2 seconds to simulate ISBN : 0-201-76040-1 // a lengthy operation Pages : 432 ThreadSleep(2000); _asyncRequestState_ctxResponseWrite( "<h1>Async handler responded</h1>");
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from // pages aspnet we are finished processing this the reader to a high level of technical and its tell It captures the true essence of ASPNET and walks request architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom _asyncRequestStateCompleteRequest();
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