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public class CalcHandler : IHttpHandler
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{ [ Team LiB ] public void ProcessRequest(HttpContext ctx) { int a = intParse(ctxRequest["a"]); int b = intParse(ctxRequest["b"]); switch (ctxRequest["op"]) { case "add": ctxResponseWrite(a+b); break; case "subtract": ctxResponseWrite(a-b); break; case "multiply": Table of Contents ctxResponseWrite(a*b); break; Essential ASPNET with Examples in C# default: ByFritz Onion ctxResponseWrite("Unrecognized operation"); break; Publisher : Addison Wesley } Pub Date : February 11, 2003 }
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ISBN : 0-201-76040-1 Pages public : 432 IsReusable { get { return false; } } bool
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing Listing 4-14 Calculator Request for ashx Handler from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom
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http://localhost/httppipeline/calcashx a=3&b=4&op=multiply
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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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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how You may have of the that framework Subsequent chapters explore the host property called in ASPNET, it builds on topnoticed NET the IHttpHandler interface supports a read-only of new features IsReusable, used to indicate whether compilation a particular handler can be server-side controls, form custom including the server-side instances of model, code-behind classes,safely pooled If you build avalidation, the handler and model, and from this property, ASPNET Throughout the book, handler as they are used to data binding return true custom control developmentpools instances of your working examples illustrate service requests building Web-based a new instance of best practices for If you return false, applications in C#your handler is created each time a request is serviced In general, it typically doesn't make that much difference whether your handlers are pooled or not, because the instantiation mechanism in Among the topics explored in depth are:the CLR and the garbage collector are quite efficient, so typically little is gained by doing pooling on your handler classes The one case you might consider enabling pooling is if it takes significant time to set up the handler For example, if your handler retrieved information from a ASPNET architecture database to perform its request processing, and that information did not change from one request to the next, it might make sense to request pooling on your handler Handler pooling is never used by the standard Web forms handlers provided by ASPNET The Page class, which is by far the most common handler, returns false fromIsReusable, and the factory class that allocates pages does not even perform pooling The same goes Configuration for ashx handlers they are never pooled HTTP pipeline
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444 Custom Handler error handling Diagnostics and Factories
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If youValidation control over the creation of your handler, you can write a custom handler factory a class want more that implements the IHttpHandlerFactory interface, as shown in Listing 4-15 The first method, Data binding GetHandler(), is called when a new instance of the requested handler is needed The ReleaseHandler() method is called when the pipeline is finished processing a request with a handler, placing the control of Custom controls handler creation and destruction in your hands The deployment of a handler factory is identical to that of a custom handler, but instead of specifying a class that implements IHttpHandler, you specify a class that Caching implements IHttpHandlerFactory When a handler is requested, the runtime queries the class listed in the configuration file, and if it supports the IHttpHandlerFactory interface, it uses the factory to create State management an instance of the handler Otherwise, it queries the class for its IHttpHandler interface and creates it directly
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