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Now that you understand that every page is compiled into a class definition, the next step is to understand exactly how that class is created and what control you have over its creation As a first experiment, because we know that our page is turned into a class, we can display the type of our page and the class from which it inheritsFigure 1-2 shows a sample aspx file, along with its output, that prints out the type of the page and its base class, using the GetType() method and the BaseType property[4]
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In this example, note the use of the Output property of the Response object This is an instance of the TextWriter class, which writes to the response buffer This class is convenient to use when you need to construct strings, because it supports the formatting of strings, which is more efficient than string concatenation
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Table of Contents
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Essential ASPNET with Examples in C# Page Type Figure 1-2 ASPNET
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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:
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ASPNET architecture Web forms Configuration HTTP pipeline
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Notice that the type of the page is ASPShowPageType_aspx, which is simply the name of the file with the Diagnostics and error handling "" replaced by an "_" character More interestingly, the base class is SystemWebUIPage, which defines most of the functionality for processing requests in ASPNET By default, every aspx page you author Validation derives from the Page base class As with any other class hierarchy, it is important to understand the features and functionality of the class from which you inherit Listing 1-3 shows some of the most interesting Data binding members of the Page class
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Custom controls Listing 1-3 Important Members of SystemWebUIPage Caching State management public class Page : TemplateControl, IHttpHandler {
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// [ Team LiB ] public public public // public public public public
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State management HttpApplicationState Application {get;} virtual HttpSessionState Session { get;} Cache Cache {get;} Intrinsics HttpRequest Request {get;} HttpResponse Response {get;} HttpServerUtility Server {get;} string MapPath(string virtualPath);
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// Client information public ClientTarget ClientTarget {get; set;} public IPrincipal User {get;} // CoreTable of Contents public UserControl LoadControl(string virtualPath); Essential ASPNET with Examples in C# public ByFritz Onion virtual ControlCollection Controls {get;} public override string ID { get; set;}
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Publisher Pub Date Pages
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public bool IsPostBack {get;} : February 11, protected void 2003 ISBN : 0-201-76040-1 RenderControl(HtmlTextWriter writer);
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: 432
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: Addison Wesley
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing ThePage class It captures the true state management, including the reader Application and Session from its pagesprovides facilities for essence of ASPNET and walksthe familiar to a high level of technical and state objects plus a new Cache object, the of Software Engineering, NASDAQcom architectural skill"-J Fred Maples, Director details of which are discussed in 9 All the familiar intrinsics ASP programmers are used to can be found exposed as properties in the Page class, including the Response,Request, and Server objects This means that the definitive reference for ASPNET through Essential ASPNET with Examples in C# is the C# programmer'sfamiliar ASP-style syntax of accessing something like the Response object will compile because it maps onto needed to fully understand which version 11 It provides experienced programmers with the information a property of the class from the your page inherits The details of the new classes to build robust ASP intrinsics are discussed later in this technology, and is a clear guide to using ASPNET that replace theand well architected Web applications chapter This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how Once you are aware that your pages are turned into classes, explore start taking advantage of this fact by it builds on top of the NET framework Subsequent chapters you can the host of new features in ASPNET, adding features to your page as you model, code-behind classes, For example, consider the page shown in including the server-side compilationmight add features to a classserver-side controls, form validation, the Listing 1-4 data binding model, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# Listing 1-4 Sample ASPNET Page with Data Members Among the topics explored in depth are:
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<! SamplePageaspx > ASPNET architecture <%@ Page Language="C#" %> <html><body> Web forms <script language="C#" runat=server> private ArrayList _values = new ArrayList(); Configuration private void PopulateArray() { HTTP pipeline _valuesAdd("v1"); Diagnostics and error handling _valuesAdd("v2"); _valuesAdd("v3"); Validation _valuesAdd("v4"); } Data binding </script>
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Custom controls <h2>aspx==class!</h2> <ul> Caching <% PopulateArray(); State management for (int i=0; i<_valuesCount; i++) ResponseOutputWrite("<li>{0}</li>", _values[i]);