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Description
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Binds all the data-bound controls contained in the page to their data sources. The DataBind method doesn t generate code itself but prepares the ground for the forthcoming rendering. Outputs the HTML text for the page, including tracing information if tracing is enabled. Controls call this method when they render to ensure that they are included in the body of a server form. The method does not return a value, but it throws an exception in case of error.
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Method
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DataBind
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RenderControl VerifyRenderingInServerForm
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5 Anatomy of an ASP.NET Page
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In an ASP.NET page, no control can be placed outside a <form> tag with the runat attribute set to server. The VerifyRenderingInServerForm method is used by Web and HTML controls to ensure that they are rendered correctly. In theory, custom controls should call this method during the rendering phase. In many situations, the custom control embeds or derives an existing Web or HTML control that will make the check itself. Not directly exposed by the Page class, but strictly related to it, is the GetWebResourceUrl method on the ClientScriptManager class. (You get a reference to the current client script manager through the ClientScript property on Page.) When you develop a custom control, you often need to embed static resources such as images or client script files. You can make these files be separate downloads; however, even though it s effective, the solution looks poor and inelegant. Visual Studio allows you to embed resources in the control assembly, but how would you retrieve these resources programmatically and bind them to the control For example, to bind an assembly-stored image to an <IMG> tag, you need a URL for the image. The GetWebResourceUrl method returns a URL for the specified resource. The URL refers to a new Web Resource service (webresource.axd) that retrieves and returns the requested resource from an assembly.
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// Bind the <IMG> tag to the given GIF image in the control's assembly img.ImageUrl = Page.GetWebResourceUrl(typeof(TheControl), GifName));
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GetWebResourceUrl requires a Type object, which will be used to locate the assembly that contains the resource. The assembly is identified with the assembly that contains the definition of the specified type in the current AppDomain. If you re writing a custom control, the type will likely be the control s type. As its second argument, the GetWebResourceUrl method requires the name of the embedded resource. The returned URL takes the following form:
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WebResource.axd a=assembly&r=resourceName&t=timestamp
The timestamp value is the current timestamp of the assembly, and it is added to make the browser download resources again if the assembly is modified.
Controls-Related Methods
Table 5-12 details a bunch of helper methods on the Page class architected to let you manage and validate child controls and resolve URLs.
TABLE 5-12
Helper Methods of the Page Object
Description
Initializes the instance of the Page class at design time, when the page is being hosted by RAD designers such as Visual Studio. Takes a control s ID and searches for it in the page s naming container. The search doesn t dig out child controls that are naming containers themselves.
Method
DesignerInitialize FindControl
Part II
ASP.NET Pages and Server Controls
Method
GetTypeHashCode
Description
Retrieves the hash code generated by ASP.xxx_aspx page objects at run time. In the base Page class, the method implementation simply returns 0; significant numbers are returned by classes used for actual pages. Returns a collection of control validators for a specified validation group. Determines whether the page contains any child controls. Compiles and loads a user control from an .ascx file, and returns a Control object. If the user control supports caching, the object returned is PartialCachingControl. Compiles and loads a user control from an .ascx file, and returns it wrapped in an instance of an internal class that implements the ITemplate interface. The internal class is named SimpleTemplate. Retrieves the physical, fully qualified path that an absolute or relative virtual path maps to. Parses a well-formed input string, and returns an instance of the control that corresponds to the specified markup text. If the string contains more controls, only the first is taken into account. The runat attribute can be omitted. The method returns an object of type Control and must be cast to a more specific type. Registers a control as one that requires control state. Registers the specified control to receive a postback handling notice, even if its ID doesn t match any ID in the collection of posted data. The control must implement the IPostBackDataHandler interface. Registers the specified control to handle an incoming postback event. The control must implement the IPostBackEventHandler interface. Mostly for internal use, the method sets an internal flag that causes the page view state to be persisted. If this method is not called in the prerendering phase, no view state will ever be written. Typically, only the HtmlForm server control for the page calls this method. There s no need to call it from within user applications. Resolves a relative URL into an absolute URL based on the value of the TemplateSourceDirectory property. Instructs any validation controls included in the page to validate their assigned information. If defined in the page, the method honors ASP.NET validation groups.
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