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CHAPTER 3 PAGE OBJECT INTERNALS
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This is the unique ID that identifies any element on the page with the runat=server attribute on it. This should also be the same as the name of the variable you plan to use in your code-behind. The code-generation step automatically declares a variable with this name that overrides the declaration from your code-behind base class. This means that at runtime, the element in your markup and the variable declared in your codebehind are the same instance of the same class. This is why everything you do to a Web Control from code-behind shows up in the resulting page. This dual-declaration infrastructure is eliminated in version 2.0 via partial classes. This is an instance of the Page object. For controls, this value will point to the instance of the Page that the control is living on. For a Page object, this value will point to itself. So (this.Page == this) is necessarily true in a type that inherits from the Page object. This is the instance of the Control that has this Control in its control collection. For a Page object, this value is null, as the Page is the root of the tree. For a Form object living on a Page, this value will point to the Page. So for a Form, it s true that (this.Page == this.Parent). However, for a Control living on the Form, the Parent is the Form object. Every control can have its visibility set to false. This is a nice feature, because while the control will squirrel away its state in the ViewState hidden input, it won t render any HTML to represent itself at all. This is very different than using Cascading Style Sheets (CSS) or script to make an element hidden once it gets to the client. This makes it possible to code a Wizardstyle interface using Panel controls, where only one Panel is visible at a time. All of the children of the panel will store their state in the ViewState, but their markup will be generated only when the Panel is visible, keeping the response stream as short as possible. Of course, this also means you can set the visibility of the Page itself to false, but we ve yet to find any usefulness in a page you can t see. This will return true if there are any controls in the ControlCollection of the Control you ve called the method on. It s useful for quickly checking if a Control has any children of its own. This event occurs when the server control is initialized, which is the first step in its life cycle.
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Continued
Page
System.Web.UI.Page
Parent
System.Web.UI.Control
Visible
Boolean
HasControls()
Boolean
Init
Event
CHAPTER 3 PAGE OBJECT INTERNALS
Table 3-1. Continued
Member Name
Load
Type
Event
Meaning in Life
This is the first event to fire after the control tree and ViewState of the page have been created and restored. Generally you use this event for page initialization, wrapping your code in a clause that causes it not to fire on postbacks, as postback logic usually lives in an event handler of a specific control. This event occurs just before the page does a recursive descent of its control tree and calls the render method to assemble to output stream. More on this event later. This event fires after the output stream has been rendered and sent back to IIS. You cannot modify the output stream from this event. The only thing to be done from this event is to clean up any resources you ve held onto over the lifetime of the Page object instance.
PreRender
Event
Unload
Event
Note The Page object has some new events in version 2.0 that we ll look at a bit later. Table 3-1 displays
properties and events specific to the Control class, which the Page object (and all Web Controls) inherits.
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