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In the examples so far, the page controls replicate the structure of the site map file exactly. However, this isn t always what you want. For example, you might not like the way the Home node sticks out because of the XmlSiteMapProvider rule that every site map must begin with a single root. To clean this up, you can set the SiteMapDataSource.ShowStartingNode property to false. Then, modify the site map file so it defines the Home entry in the first group of pages. (The root node won t be shown, so you can use a dummy node with any URL for it.) Here s the revised site map: <siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0"> <siteMapNode title="Root" description="Root" url="~/"> <siteMapNode title="Home" description="Home" url="~/default.aspx"/> <siteMapNode title="Products" description="Our products" url="~/Products.aspx"> ... </siteMapNode> </siteMap>

ChildNodes collection using the AddNode method that s inherited from StaticSiteMapProvider Here s the complete code: private void AddChildren(SiteMapNode rootNode, string rootID, DataTable dtSiteMap) { DataRow[] childRows = dtSiteMapSelect("ParentID = " + rootID); foreach (DataRow row in childRows) { SiteMapNode childNode = new SiteMapNode(this,.

You can switch your program into break mode at any point by clicking the pause button in the toolbar or by selecting Debug Break All.

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Figure 16-11. A site map without the root node This example shows how you can skip the root node. Another option you have is to show just a portion of the complete site map, starting from the current node. For example, you might use a control such as the TreeView to show everything in the hierarchy starting from the current node. If the user wants to move up a level, they could use another control (such as a SiteMapPath). To implement this design, simply set the SiteMapDataSource.StartFromCurrentNode property to true. The SiteMapPath will still show the complete hierarchy, allowing the user to move up to a higher-level page. However, other bound controls will show only pages beneath the current page, allowing the user to move down the hierarchy. You still have the choice of whether to use ShowStartingNode, but now it determines whether you show the current node (because that s the starting point for the navigation tree). Figure 16-12 shows an example where both StartFromCurrentNode and ShowStartingNode are true. The current page is Software.aspx. The SiteMapPath shows higher-level pages, and the TreeView shows the nodes underneath the Software.aspx node.

row["Url"].ToString(), row["Url"].ToString(), row["Title"].ToString(), row["Description"].ToString()); string rowID = row["ID"].ToString(); // Use the SiteMapNode AddNode method to add // the SiteMapNode to the ChildNodes collection. AddNode(childNode, rootNode); // Check for children in this node. AddChildren(childNode, rowID, dtSiteMap); } } The only limitation in the AddChildren() method is that it doesn t attempt to apply any sort of positioning. Instead, entries are added in the order they appear in the database. Changing this behavior isn t difficult. To do so, you need to add a SortOrder column to the database table. Then, you could sort the records before adding them using an overload of the DataTable.Select() method. The only remaining details are to fill a few other required overloads that retrieve the site map information: protected override SiteMapNode GetRootNodeCore() { return BuildSiteMap(); } public override SiteMapNode RootNode { get { return BuildSiteMap(); } } protected override void Clear() { lock (this) { rootNode = null; base.Clear(); } } This completes the example. You can now request the same pages you created earlier, using the new site map provider (as configured in the web.config file). The custom provider plugs in easily and neatly. The new information will flow through the custom provider and arrive in your pages without any indication that the underlying plumbing has changed.

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