<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" > in .NET

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<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
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Within the siteMap element is nested exactly one <SiteMapNode> (in this case, Home). Nested within that first <SiteMapNode>, however, is any number of children <SiteMapNode> elements. Each <SiteMapNode> element can in turn have any number of children <SiteMapNode> elements.
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6: Style Sheets, Master Pages, and Navigation
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In Example 6-15, there are three such children: Sales, Production, and Human Resources. Nested within each of these <SiteMapNode> elements can be more nodes. For example, Sales contains Orders and Stores. You may nest the nodes as deep as you wish.
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ASP.NET is configured to protect files with the extension .sitemap so they cannot be seen by a browser.
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Once the site map file is in place, you need to identify it to the master page. This is done by dragging a SiteMapDataSource control from the Data section of the Toolbox onto the master page. By default, the SiteMapDataSource control will look for and use the file named Web.sitemap. It doesn t matter where you place this SiteMapDataSource control, as long as it is somewhere between the <form> and </form> tags in Source view. The SiteMapDataSource will be visible in Design view but will not appear when the web site is run. The Design view should look something like Figure 6-20.
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There are two types of controls that can provide site-map menu capability: a TreeView control and a Menu control. To see both at work, you ll first create a TreeView control, then you will comment that out and add a Menu control.
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TreeView
The TreeView provides the familiar hierarchical view of items. One very familiar use of a TreeView is the Windows Explorer view of folders and subfolders. Recall when you created the master page for this example there was an empty table cell in the layout. Switch to Source view, and then, from the Navigation section of the Toolbox, drag a TreeView control into that empty cell. (You can do this in Design view, of course, but we find it easier to use Source view when dragging elements into a cell.) Switch back to Design view and click on the Smart Tag of the TreeView. Click on the drop-down next to Choose Data Source and select SiteMapDataSource1, the ID of the SiteMapDataSource you just placed on the master page, as shown in Figure 6-21.
As soon as you select the data source for the TreeView, it will display the nodes from the site map file in Design view.
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6: Style Sheets, Master Pages, and Navigation
Set Home.aspx as the startup page by right-clicking on it in the Solution Explorer and selecting Set As Start Page from the menu. Run the web site now and see the TreeView menu in action. Click on any of the menu items along the left of the web site and observe how it navigates from page to page. If you click on the Stores menu item, it will look almost exactly like Figure 6-18. The only difference is the bread crumbs are missing because you have not yet placed that control on the page. Menu items that contain subitems of their own, such as Home and Sales, display a small icon next to them. Clicking on this icon toggles between expanded and collapsed views of these subitems. This structure directly flows from the nesting of SiteMapNodes in the site map file.
Customizing the look and feel of the TreeView
The TreeView control has many properties, methods, and events, which allow you to customize the look and feel of the TreeView. The easiest way to change the appearance of the TreeView is to view the page in Design view, click the TreeView s Smart Tag, and then click Auto Format , as shown in Figure 6-22.
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Most of the TreeView s properties have to do with the styles used for the various nodes. There are properties for general nodes, parent nodes, child (leaf) nodes, root nodes, selected nodes, and nodes when the mouse is hovering over them. For each of these node types you can set font attributes, CSS class, fore- and back-colors, spacing and padding, borders, and so on.
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