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ASP .NET server-side controls derive from a class named System.Web.UI.Control . In fact, the Control class is the core of almost every user interface (UI) element in ASP .NET . Even System.Web.UI.Page is derived from the Control class . Table 4-1 shows a small sampling of the System.Web.UI.Page class .
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Part I Fundamentals
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TABLE .4-1 . Sampling .of .the .Page s .Properties, .Methods, .and .Events
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Application Cache Controls CreateChildControls Init IsPostBack Load RenderControl Request Response Session Unload
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Reference to the HttpApplicationState object associated with the current request Reference to the application s cache an in-memory dictionary of application-wide state (usually for optimization) The control collection maintained by Page Virtual method during which the page constructs its control tree Event indicating the page has initialized Distinguishes the request as either a new request or a POST Event indicating the page has been loaded Virtual method during which the page renders its contents Reference to a stateful object representing the incoming request Reference to a stateful object representing the outgoing response Reference to a stateful object representing information specific to the current request Event indicating the page has unloaded
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The entries in Table 4-1 show a small cross section of the functionality available in System.Web.UI.Control . Later you visit all these members while investigating ASP .NET Web Forms . Remember from the last chapter that ASP .NET Web Forms manage a collection of controls as part of their internal structure . As you add controls to a Web page, they re placed in the collection . When it comes time for a page to render its content back to the client, System.Web.UI.Page iterates the collection of controls and asks each one to render itself . If a control contains subcontrols (just as a page includes controls), ASP .NET walks down those collections as well . You can see the RenderContents method in Table 4-1 . RenderContents takes a single argument of type HtmlTextWriter . You examine that class later in this chapter . Right now, think of it as the conduit through which you send the page s response back to the client . Other elements of the Control class include items such as the following:
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Properties for managing the control s view state Properties for managing skins (to accommodate a consistent look and feel across multiple pages in a site) Properties for getting the parent control (in the case of composite controls) and the parent page Event handlers for the Init, Load, PreRender, and Unload events
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4 Custom Rendered Controls
Methods for raising the Init, Load, PreRender, and Unload events Methods for managing child controls
In this chapter, you visit the most important topics while examining both rendered controls and composite controls . Although the Page class is sizable, it uses straightforward logic and unfolds nicely in practice . The easiest way to start is to jump into building a custom control .
Visual .Studio .and .Custom .Controls
In this section, you build a simple control (the default control Visual Studio generates for you) and see how it fits on a Web Form . Visual Studio creates a simple control that contains a single Text property, and it renders that Text property to the end browser . It s a good way to discover how server-side controls work .
Creating a custom control
. 1 . . Begin by opening the ControlsORama project from 3, as shown in the following graphic . Note: If you want to preserve the current state of ControlsORama, make a copy of the whole project directory and work on the copy . This example is built over this chapter and the next chapter to demonstrate the different approaches to developing controls .
Part I Fundamentals
2 . . Add a new project to ControlsORama by right-clicking the Solution node in Solution Explorer, and clicking Add, New Project .on the shortcut menu . Name the new project CustomControlLib . Select ASP .NET Server Control as the template, as shown here:
Visual Studio gives you a simple Web control named ServerControl1 to start with . Listing 4-1 shows the default code generated by Visual Studio for a Web Control Library .
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