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As an Web forms to precompiling the code-behind file, you can use the src attribute, as shown in Listing 1alternative 7 Any file referenced with the src attribute of the Page directive is compiled into a separate assembly and addedConfiguration referenced assemblies when the page is compiled The advantage of using the src to the list of attribute for your code-behind files is that you can update a code-behind file just by replacing the file, and HTTP pipeline the next request that comes in causes ASPNET to recompile the referenced file This saves the step of compiling the code into an assembly yourself and updating the physical assembly in the /bin directory It Diagnostics the error handling also ensures that and file will be compiled with the correct version of the NET libraries, if for some reason you have different versions installed on different machines On the other hand, if you have a compilation Validation error in your source file, it will not be detected until you deploy the file and the page is accessed again Precompiling the assembly beforehand guarantees that you will catch all compilation errors before Data binding deployment
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Custom controls Listing 1-7 Using the src Attribute to Reference a Code-Behind File Caching State management <! Codebehindaspx > <%@ Page Language="C#" src="SampleCodeBehindcs"
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Inherits="EssentialAspDotNetArchitectureSamplePage"%> [ Team LiB ] <! >
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141 Event Handling
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The code-behind example shown in the previous section extracted code from the aspx page by defining methods and fields in the code-behind class, resulting in a "cleaner" page with less code clutter In addition to methods and fields, code-behind classes can define handlers for events issued by the Page base class, which can be a useful way to manipulate the rendering of a page without adding code to the aspx file ThePage base class defines four events (actually, they are inherited from the Control base class) that are called in sequence during its lifetime: Init,Load,PreRender, and Unload, as shown in Listing 1-8 In addition, it defines four virtual function handlers for these events that are invoked when the events are fired, also shown in Listing 1-8 Thus, you can register a handler for any of these events in two ways: by Table of Contents subscribing a delegate to the event manually or by providing an overridden version of the virtual function Essential ASPNET with Examples in C# defined in the base class
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Listing 1-8 Events Defined in SystemWebUIPage
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Publisher Pub Date : Addison Wesley : February 11, 2003
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public class Page : TemplateControl, IHttpHandler ISBN : 0-201-76040-1 { Pages : 432 // Events public event EventHandler Init; public event EventHandler Load; public event EventHandler PreRender; "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing public event EventHandler Unload;
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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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// Predefined event handlers protected virtual void OnInit(EventArgs e); Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through protected virtual void OnLoad(EventArgs e); version 11 It provides experienced programmers with the information needed to fully understand the protected virtual void OnPreRender(EventArgs e); technology, and is a clear guide to using ASPNET to build robust and well architected Web applications protected virtual void OnUnload(EventArgs e); } This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how
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it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the TheInit event occurs before any server-side controls have had their state restored The Load event occurs data binding model, and custom control development Throughout the book, working examples illustrate after all server-side controls have had their state restored but before any server-side events have been best practices for building Web-based applications in C# fired The PreRender event fires after all server-side events have fired but before anything has been rendered that is, before any HTML are: Among the topics explored in depth has been returned The Unload event takes place after page rendering has completed
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TheseASPNET architecture complete control over the generation of the page; however, Load is typically events give you fairly the most useful of all of them because it gives you a chance to modify the state of controls before rendering but after their state has been restored The server-side control model is discussed in detail in the next Web forms chapter Configuration For an example of adding handlers for these events, consider the code-behind class shown in Listing 1-9 HTTP pipeline This demonstrates a technique used by Visual Studio NET when working with code-behind files, which is to provide an overridden version of the virtual OnInit method to manually subscribe a delegate to the Load event Diagnostics and error this case, the OnInit virtual function is called first, in which the delegate for the of the Page class In handling Load event is subscribed When the Load event fires, the MyLoadHandler is invoked and prints a line of Validation text at the top of the page since it is invoked before the page's rendering process Note that there is no real advantage or disadvantage to either technique, except that the manual delegate subscription requires an Data binding extra step to actually hook it up
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Custom controls Listing 1-9 Trapping Page Events in Code-Behind Caching State management // File: EventsPagecs public class EventsPage : Page
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{ [ Team LiB ] // Override OnInit virtual function to manually // subscribe a delegate to the Load event protected override void OnInit(EventArgs e) { thisLoad += new EventHandler(MyLoadHandler); } // Load event handler protected void MyLoadHandler(object src, EventArgs e) { ResponseWrite("<tiny>rendered at top of page</tiny>"); } }
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