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One of the more frustrating aspects of building traditional ASP pages was the convoluted nature of mixing server-side script with static layout elements As ASP pages grow in size, they often become harder and harder to understand as the interplay between server-side script and static HTML becomes more complex There are ways of dealing with this complexity, including imposing standards mandating scripting techniques and the use of server-side include directives to remove some of the code from a page ASPNET adds another, even more appealing option for separating programmatic logic from static page layout with a technique called code-behind In our earlier examples, we saw how each page in ASPNET is compiled into a Page-derived class Codebehind is the technique of creating an intermediate base class that sits between the Page base class and the Table of Contents machine-generated class from the aspx file This intermediate base Essential ASPNET with Examples in C# intermediateclass derives directly from Page, and the class generated from the aspx file derives from the base class instead of directly from
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Page With this technique, you can add fields, methods, and event handlers in your code-behind class and
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have these features inherited by the class created from the aspx file, removing potentially significant
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Publisher of :code from the aspx file This technique relies on the ability to specify an alternative base class Addison Wesley amounts Pubthe autogenerated11, 2003 Date : February class, which is done using the Inherits attribute of the Page directive Listings 1-5 for ISBN : our earlier sample page rewritten to use this code-behind technique and1-6 show0-201-76040-1 Pages : 432
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Listing 1-5 Sample aspx File Using Code-Behind
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<! well-conceived and > "This Codebehindaspx well-written book has extensive knowledge and priceless experience overflowing <%@ its pages It captures the from Page Language="C#" true essence of ASPNET and walks the reader to a high level of technical and Inherits="EssentialAspDotNetArchitectureSamplePage"%> architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom <html><body>
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Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through <h2>aspx==class!</h2> version 11 It provides experienced programmers with the information needed to fully understand the <ul> technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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<% WriteArray(); %>
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how </ul> it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, </body> </html> including the 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 best practices for building Web-based applications in C# Listing 1-6 Sample Code-Behind File Among the topics explored in depth are:
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// SampleCodeBehindcs
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ASPNET architecture
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using System; using SystemWeb; Web forms using SystemWebUI; using SystemCollections; Configuration
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HTTP EssentialAspDotNetArchitecture namespacepipeline { Diagnostics SamplePage : public classand error handlingPage { Validation private ArrayList _values = new ArrayList(); public SamplePage() Data binding { _valuesAdd("v1"); Custom controls _valuesAdd("v2"); _valuesAdd("v3"); Caching _valuesAdd("v4"); } State management
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protected void WriteArray() [ Team LiB ] { for (int i=0; i<_valuesCount; i++) ResponseOutputWrite("<li>{0}</li>", _values[i]); } } }
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Note that we were able to move the initialization into the constructor of our class This code-behind class must be compiled into an assembly and deployed in the /bin directory of this application for this to work (as we will see, all assemblies placed in the /bin directory of an ASPNET application are implicitly added as references to the page compilation command) The class created from our aspx file is now derived from SamplePage instead of Page because we are inserting a class into the hierarchy, as shown in Figure 1-4
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Figure 1-4 Class Hierarchy Created Using Code-Behind Essential ASPNET with Examples in C#
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ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing 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 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 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 features in ASPNET, including the 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 best practices for building Web-based applications in C# Among the topics explored in depth are: