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years ago is completely inadequate for the Web of today, in which the complexity of many sites makes it virtually impossible to retrieve a resource by URL. We can safely assume that all sites now require some form of content navigation. ASP.NET 2.0 comes with a built-in navigation infrastructure for configuring, storing, and rendering site navigation. This infrastructure has three key components:
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Site structure A common programming interface lists the inherently hierarchical structure of a Web site. This programming interface is exposed via a site map object that site map provider components fill with information read from a given data store. The default data store is a root-level XML file tentatively named app.sitemap. Site navigation Each node defined in the site map is associated with a URL so that page developers can easily retrieve and use at run time the root URL of a site section. In other words, any element defined in the site structure must be bound to a URL for run-time access. Site structure display This component renders the site navigation user interface in an intelligent fashion and maps user-friendly URLs to appropriate ASPX file paths.
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To understand the importance of built-in tools for site navigation, consider the following common scenario. In a large Web site that contains thousands of files, how do you organize a consistent site navigation mechanism Large Web sites (such as portals) are usually changing constantly, and many different groups of developers and designers work on the site. ASP.NET 2.0 makes it possible to use several files and different data stores to specify a site s structure. Each team can freely manage the pages they own, but they are bound to a common programming interface, which greatly simplifies access to the site navigation structure from any page.
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A site map is the logical container for a hierarchical collection of nodes, each representing a page in the application. Within a site map, individual pages are grouped together in folders that might or might not correspond to a physical folder. In ASP.NET 2.0 the default representation of a site map is usually an XML file named web.sitemap, like the one shown here:
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<siteMap> <siteMapNode title="Home url="default.aspx"> <siteMapNode title="Articles url="articles/articles.aspx"> <siteMapNode title="Article 1 url="articles/demoart1.aspx />
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<siteMapNode title="Article 2 url="articles/demoart2.aspx /> </siteMapNode> <siteMapNode title="Picture Gallery url="Photo/Albums.aspx"> <siteMapNode title="Meetings url="Photo/Album.aspx id=1 /> <siteMapNode title="Activities url="Photo/Album.aspx id=2 /> <siteMapNode title="Training url="Photo/Album.aspx id=3 /> </siteMapNode> </siteMapNode> </siteMap>
The site map file, if any, is parsed and transformed into a SiteMap object. The SiteMap object is globally accessible through a bunch of static methods. The XML file shown above is made up of a hierarchy of <siteMapNode> elements, each containing a title and a url attribute, and an optional description attribute. The former returns a friendly name for the element; the latter indicates the URL to jump to when that portion of the site is selected. You can also specify the contents of a site map node by referencing an external file, as the following code snippet demonstrates:
<siteMap> <siteMapNode title="Home url="default.aspx /> <siteMapNode title="About Us url="about.aspx /> </siteMap>
To reference an external site map file, you use the siteMapFile attribute on the <siteMapNode> element.
<siteMap> <siteMapNode title="Home url="default.aspx /> <siteMapNode siteMapFile="picturegallery.sitemap /> </siteMap>
The child site map file has the same structure as the parent and begins with a root <siteMap> node.
Accessing Site Map Information
The SiteMap object acts as an interface to site navigation information. This information is expressed in the form of SiteMapNode objects. The site map information exposed through the SiteMap object is loaded by a registered site map provider. The default site map provider is the XmlSiteMapProvider class, which works with the aforementioned XML configuration file named web.sitemap. A site map provider is a class that implements the ISiteMapProvider interface. A provider can store its site map information in any way, including in databases.
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