.net pdf 417 Component lifecycle in Visual Studio .NET

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Component lifecycle
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Components are complex objects capable of encapsulating other objects and child components. For example, a nonvisual component may need to encapsulate child objects and even instantiate them programmatically. A visual component, being associated with a DOM element, typically needs to attach and detach event handlers, or may create dynamic elements. Having a centralized location for initializing and disposing an instance is critical.
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The client component model
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The lifecycle of a component consists of two stages: initialize and dispose. The initialize stage begins when a component is created, and the dispose stage is reached before a component instance is removed from the memory. To accomplish the initialization routine, client components expose a method called initialize. The dispose method cleans up the current instance before it s garbage collected. Soon, you ll discover that participating in the lifecycle of a client component is about overriding the initialize and dispose methods of the Sys.Component class. Before you start to work with components, you need to understand the relationship that exists between the lifecycle of a component and the client page lifecycle. As you ll see, components interact with the Application object during the whole page lifecycle. This is possible because the Application object hosts the components instantiated in the page.
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Containers
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A container is an object that holds a collection of interface child components and provides services to those Sys.IContainer +addComponent() components. Typically, a container exposes meth+removeComponent() ods for adding, removing, and accessing the child +findComponent () components. The Microsoft Ajax Library defines +getComponents() the Sys.IContainer interface for implementing containers. The methods exposed by this interface Sys._Application are shown in figure 8.3. Figure 8.3 shows that the Sys._Application class, the single instance of which is the Application object, is a container. One of the goals of the Figure 8.3 Methods defined by Application object is to host and keep track of the the Sys.IContainer interface. The Sys._Application class is client components instantiated in the page. As an example of a client class that is you ll discover in the following sections, hosting cli- a container. ent components in a container has various advantages. For example, you can retrieve references to client components through the container, instead of storing them in global JavaScript variables. Another benefit of hosting components in the Application object is that they re automatically disposed by the container when the page is unloaded by the browser. This means you don t have to manually call the dispose method on each component instance. Client components become children of the Application object during their creation process, which is illustrated in section 8.2.1.
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ASP.NET AJAX client components
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Sys.Application
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1. init
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Initialize
2. load
Figure 8.4 Client page lifecycle and component s internal lifecycle: client components are hosted by the Application object during their creation and are automatically disposed when the page is unloaded by the browser.
3. unload
Dispose
Figure 8.4 shows the interaction between the Application object and one of its child components. Client components are usually instantiated in the init stage of the client page lifecycle and initialized before the load stage is entered. This means that when the load event is raised, client components are already initialized and ready for use. Finally, components are disposed during the unload stage by the Application object.
NOTE
Interaction with client components shouldn t happen until the load event of the client page lifecycle is raised. Only when the load event is raised is everything hooked up and ready.
We discussed the client lifecycle of an ASP.NET AJAX page in chapter 2. Be sure you understood the material presented there before you proceed. After this overview of the client component model, you re ready to start working with client components; let s shift from theory to practice by creating your first trivial component.
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