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is not called unless you explicitly call baseRender() Thus, if your control contains other controls as child controls, you should decide whether it makes sense to render those child controls in your Render Publisher : Addison Wesley implementation and call baseRender() as appropriate
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Pub Date : February 11, 2003
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Finally, note 0-201-76040-1 the Visible property of your control to false, the base class implementation ISBN : that if you set of RenderControl does not dispatch the call to your Render method at all Pages : 432 Control authors should understand how controls are identified, both internally and when they are rendered to the client Three identifiers are associated with a control: ClientID,ID, and UniqueID Most of the time, these identifiers will be the same If your control is labeled with an ID attribute when it is used, the "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing value of that attribute will be your control's ID, and if not, ASPNET synthesizes an ID for your control when from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and it is rendered If, however, your control is a child control of another control that is a naming container (such architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom as a Repeater), these three values will be different In this scenario, the ID will still be whatever string was placed in the ID attribute for your control, but the UniqueID will be that ID prefixed with the ID of the Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through containing control (such as _ctrl0:myid), and the ClientID will be the same as the UniqueID but with version 11 It provides experienced programmers with the information needed to fully understand the the ":" character replaced with the "_" character (such as _ctrl0_my_id) This ensures that repeated technology, and is a clear guide to using ASPNET to build robust and well architected Web applications instances of a control marked with the same ID are scoped by its container control, avoiding ID clashes in the book When with a discussion of the you need a unique design of generated HTML, you should use Thisclient begins rendering your control, ifrationale behind the ID in your ASPNET and an introduction to how the ClientID, because it framework Subsequent chapters ID The convention used by the it builds on top of the NETwill always be an HTML-compatibleexplore the host of new features in ASPNET, WebControls and HtmlControls is to use code-behind classes, name attribute of rendered HTML including the server-side compilation model, the UniqueID for the server-side controls, form validation, the controls, and ClientID custom control development Throughout the book, working examples illustrate data binding model, and for the ID attribute
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best practices for building Web-based applications in C# Finally, it is useful to know what accessors are available when you are authoring controls You have direct access the topics explored in depth through the Page property and to the current HttpContext through Among to your containing Page classare: the Context property The Parent property can be used to query your immediate parent control The remaining elements of the Control class are discussed as we explore control implementation techniques in more ASPNET architecture detail next Web forms
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Although you can completely render your control by using only the Write method of the HtmlTextWriter HTTP pipeline class, many other methods are available that can both simplify rendering and make the output more browser generic Internally, handling Diagnostics and error all the Web controls defined in the SystemWebUI hierarchy use the HTMLrendering methods of the HtmlTextWriter class to generate their output This class can be used in three ways to generate HTML output First, you can use the overridden versions of Write and WriteLine to Validation generate whatever text you need into the response buffer Second, you can use the non-stack-based convenience methods, such as WriteBeginTag and WriteEndTag, to generate each HTML element Data binding programmatically instead of generating string literals The third, and most appealing, way is to use the Custom controls stack-based methods, such as RenderBeginTag and RenderEndTag, for easily constructing blocks of nested HTML elements Listing 8-6 shows the core methods of the HtmlTextWriter class, grouped into Caching methods you would use for each of the three rendering techniques supported by the class
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