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PersonalizationMode PreviousPage Title
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A couple of these properties IsCrossPagePostBack and PreviousPage deserve a few more words. In ASP.NET 2.0, pages are no longer forced to always post to themselves. Pages can automatically post the contents of their unique HTML form to other pages. How can the target page distinguish between a page and a cross-page postback By simply using the IsPostBack and IsCrossPagePostBack properties. In the case of a cross-page postback, the target knows about the posting page and can retrieve the values of the original controls because a reference to the posting page is returned by the PreviousPage property. In the upcoming section Programming the Page, you ll see an example of this feature.
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Methods of the Page Class
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The Page class features a handful of new methods, most of which are simply inherited from the base Control class. Table 1-5 lists them all.
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Part I ASP.NET Essentials
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Description Inherited from Control and not especially useful for a page, this method ensures that the current object gets a unique ID. Inherited from Control and not especially useful for a page, this method ensures that the page gets the input focus. Returns the prototype of a client-side JavaScript function that posts back to the server using a callback function to implement a form of remote scripting. Returns the collection of all validator controls that belong to the specified group. Returns a valid URL that serves up a file (i.e., a GIF file) that was embedded in the page as a named resource. Registers the specified control as one that requires control state management. (More on control state later.) Sets the input focus to a particular control contained in the page. Checks whether the current browser is of the specified type.
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Method EnsureID
Focus
GetCallbackEventReference
GetValidators GetWebResourceUrl RegisterRequiresControlState SetFocus TestDeviceFilter
The methods listed in the table address some interesting new types of functionality, such as the control state (as opposed to the control view state), validation groups, and an enhanced script object model.
Events of the Page Class
The life cycle of a page in the ASP.NET runtime is marked by a series of events. By wiring their code up to these events, developers can dynamically modify the page output and the state of constituent controls. In ASP.NET 1.x, a page fires events such as Init, Load, PreRender, and Unload that punctuate the key moments in the life of the page. ASP.NET 2.0 adds quite a few new events to allow you to follow the request processing more closely and precisely. The new events are listed in Table 1-6. The order is alphabetical; we ll discuss the order in which they are fired in just a moment.
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1
Creating an ASP.NET 2.0 Application
Table 1-6 New Events of the Page Class
Event InitComplete LoadComplete PreInit PreLoad PreRenderComplete
Description Occurs when the page initialization step is completed. Occurs at the end of the load stage of the page s life cycle. Fires before the page begins its initialization step. This is the first event in the life of an ASP.NET 2.0 page. Fires just before the page begins loading the state information, immediately after initialization. Occurs when the prerendering phase is completed and all child controls have been created. After this event, the personalization data and the view state are saved and the page renders to HTML.
Let s review the full life cycle of an ASP.NET 2.0 page.
The Page Life Cycle
An ASP.NET page springs to life when the ASP.NET runtime invokes the IHttpHandler::ProcessRequest method on the dynamic class created to wrap the source code of the requested .aspx resource. The method sets the intrinsics for the page, such as the HTTP context and the Request and Response objects. Next it builds the tree of controls that were declared in the .aspx source and determines whether the page is being run in postback mode, callback mode, or cross-page postback. (I ll say more about callback mode later.) The first chance that developers have to get into the game is when the PreInit event occurs.
Page preinitialization When the PreInit event handler returns, the page loads any personalization data and initializes any themes. This is the right time to intervene if you want to programmatically set the page theme. Page initialization Each control in the page is recursively given a chance to initialize and configure its state. Child controls have their Init event fired before the Init event on the container page. End of page initialization The InitComplete event occurs at the end of the loop that initializes all child controls. In between Init and InitComplete, only one thing happens the view state of controls is set up for tracking. Each control has its TrackViewState method called. By default, this method sets a flag that instructs the control to track its view state for changes.
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