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One of the most important classes in the pipeline is the HttpContext class This class maintains all the request-specific data and is accessible to most elements within the pipeline The context class shows up as a parameter to many methods, including the ProcessRequest method of handlers, and it is directly accessible via the Context property of both the Page class and the HttpApplication class Table 4-1 shows the set of properties available on the HttpContext class
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Table of Contents
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Table 4-1 Properties of HttpContext Description Context for the request currently in progress
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Essential ASPNET with Examples in C#
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Name ByFritz Onion Type
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Current (static)
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Application Publisher : Addison Wesley HttpApplicationState Application-wide property bag
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Pub Date : February 11, ApplicationInstance 2003 HttpApplication ISBN Session Pages : 0-201-76040-1 HttpSessionState : 432
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Active application instance Per-client session state HTTP request object HTTP response object
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Request Response
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HttpRequest
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User IPrincipal Security ID of the caller "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing Handler IHttpHandler Handler for the request from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and Items IDictionary Per-request property bag architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Server HttpServerUtility HTTP server object Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through Error Exception Unhandled exception object version 11 It provides experienced programmers with the information needed to fully understand the Cache Cache Application-wide cache technology, and is a clear guide to using ASPNET to build robust and well architected Web applications Trace TraceContext Trace class for diagnostic output This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how TraceIsEnabled Boolean Whether tracing is currently enabled it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, WorkerRequest HttpWorkerRequest The current worker request object including the server-side compilation model, code-behind classes, server-side controls, form validation, the IsCustomErrorEnabled Boolean data binding model, and custom control development Throughout the book, working examples illustrate Whether custom error pages are currently enabled best practices for building Web-based applications in C# IsDebuggingEnabled Boolean Whether the current request is in debug mode IsInCancellablePeriod Boolean Among the topics explored in depth are:
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Whether the current request can still be cancelled
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TheItems property bag is a particularly useful collection to be aware of because it lets you store and ASPNET architecture retrieve request-specific data from anywhere in the pipeline This can be useful if you are building custom modules, for example, and want to save information at one point during the request to read again later in Web forms the request The interface to the Items collection is similar to all the other property-bag collections, using a string-based indexer to store an object reference Configuration Another useful property to know about is the static Current property of the HttpContext class This HTTP pipeline property always points to the current instance of the HttpContext class for the request being serviced This can be convenient if you are writing helper classes that will be used from pages or other pipeline Diagnostics and error handling classes and may need to access the context for whatever reason By using the static Current property to retrieve the context, you can avoid passing a reference to it to helper classes For example, the class shown Validation in Listing 4-1 uses the Current property of the context to access the QueryString and print something to the current binding Data response buffer Note that for this static property to be correctly initialized, the caller must be executing on the original request thread, so if you have spawned additional threads to perform work during a request, you must take care to provide access to the context class yourself Custom controls
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Caching Listing 4-1 Using the Current Property of HttpContext State management
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public class MyClass
{ [ Team LiB ] void SomeFunction() { HttpContext ctx = HttpContextCurrent; ctxResponseWrite("Hello, "); string name = ctxRequestQueryString["name"]; ctxResponseOutputWriteLine(name); } }
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