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The shell s ActionRegion contains the OrdersView. The OrdersView contains the Submit All and Cancel All buttons as well as the OrdersRegion. The OrdersRegion is attached to a ListBox control which displays multiple OrderCompositeViews. IRegion A region is a class that implements the IRegion interface. The region is the container that holds content to be displayed by a control. The following code shows the IRegion interface.

The SiteMapProvider establishes the base class used by the navigation controls . The ASP .NET default implementation is the XmlSiteMapProvider, which reads the XML file named (by default) web.sitemap . Although the default XML site map generally works very well, the ASP .NET navigation controls are perfectly happy using data sources generated from other places (rather than the XML data source) . For example, you might decide to implement your own site map provider based on data in a database . The XML site map provides basic raw functionality for navigating a site . However, if you want to do something like manage the site map using a schema different from the default XML schema, that calls for designing a custom provider . This chapter looks at the default XML site map provider which is plenty powerful for most circumstances .

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An Example of Using Special Sources The example, Using Special Sources to capture unprocessed events or errors, demonstrates how the Logging block reacts under these two circumstances. The code first writes a log entry to a category named InvalidCategory, which does not exist in the configuration. Next, it writes another log entry to a category named CauseLoggingError that is configured to use a Database trace listener. However, this trace listener specifies a connection string that is invalid; it points to a database that does not exist.

The main rendezvous point for the ASP .NET navigation infrastructure is the SiteMap class . To support the navigation infrastructure, the SiteMap class has a set of static methods for managing site navigation . The SiteMap class serves as an in-memory representation of the navigation structure for a site, and its functionality is implemented by one or more site map providers . It s an abstract class, so it must be inherited . The SiteMap class performs several functions . First, it serves as the root node of the site navigation hierarchy . Second, it establishes the principal site map provider . Finally, it keeps track of all the provider objects that comprise the site map . The SiteMap contains a hierarchical collection of SiteMapNode objects . Regardless of how the site map data is maintained, the SiteMap is the interface for accessing a site s navigation information .

C# public interface IRegion : INavigateAsync, INotifyPropertyChanged { IViewsCollection Views { get; } IViewsCollection ActiveViews { get; } object Context { get; set; } string Name { get; set; } Comparison<object> SortComparison { get; set; } IRegionManager Add(object view);

The ASP .NET default configuration specifies a default site map . However, as with all things configurable in ASP .NET, you can easily override the default configuration to establish a different provider . The SiteMap class offers only static members . By being static, they enhance performance . In addition, the site map functionality can be accessed at any time in a Web application from a page or even from within a server-side control . Table 11-2 describes the properties and sole event the SiteMap class exhibits .

The SiteMapResolve event fires when the CurrentNode property is accessed . This enables you to implement custom logic when creating a SiteMapNode representation of the currently executing page without requiring a custom provider implementation . A SiteMapNode instance that represents the currently requested page in the navigational hierarchy . If there is no node in the XML site map file, the returned value is null . Returns a Boolean value indicating whether a site map provider is both specified and enabled in the web .config file . Returns the default SiteMapProvider for the current site map . Returns a read-only collection of named SiteMapProvider objects that are available to the SiteMap class as specified in the web .config file (because you can specify more than one if you wish) . Note that only the default provider is used during initialization, however . Returns the SiteMapNode that represents the top-level page of the navigation hierarchy for the site .

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