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The TreeView is the most impressive new control in ASP .NET 2.0. Not only does it allow you to render rich tree views, it also supports filling portions of the tree on demand (and without refreshing the entire page). But most important, it supports a wide range of styles that can transform its appearance. By setting just a few basic properties, you can change the TreeView from a help topic index to a file and folder directory listing. In fact, the TreeView doesn t have to be rendered as a tree at all it can also tackle nonindented hierarchical data such as a table of contents with the application of just a few style settings. You ve already seen two basic TreeView scenarios. In 12, you used a TreeView to display bound XML data. In this chapter, you used a TreeView to display site map data. Both of these examples used the ability of the TreeView to bind to hierarchical data sources. But you can also fill a TreeView by binding to an ordinary data source (in which case you ll get only a single level of nodes) or by creating the nodes yourself, either programmatically or through the .aspx declaration. The latter option is the simplest. For example, by adding <asp:TreeNode> tags to the <Nodes> section of a TreeView control, you can create several nodes:

And here s the code that sets the current view based on the list index: protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { MultiView1.ActiveViewIndex = DropDownList1.SelectedIndex; } Figure 16-2 shows the result.

ASP .NET actually defines three navigation controls: the TreeView, Menu, and SiteMapPath. The SiteMapPath provides breadcrumb navigation, which means it shows the user s current location and allows the user to navigate back up the hierarchy to a higher level using links. Figure 16-10 shows an example with a SiteMapPath control when the user is on the Software.aspx page. Using the SiteMapPath control, the user can return to the Products.aspx page or the Home.aspx page.

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<asp:TreeView runat="server"> <Nodes> <asp:TreeNode Text="Products"> <asp:TreeNode Text="Hardware"/> </asp:TreeNode> <asp:TreeNode Text="Services"/> </Nodes> </asp:TreeView> And here s how you can add a TreeNode programmatically when the page loads: Dim newNode As New TreeNode("Software") ' Add as a child of the first root node ' (the Products node in the previous example). TreeView1.Nodes(0).ChildNodes.Add(newNode) When the TreeView is first displayed, all the nodes are shown. You can control this behavior by setting the TreeView.ExpandDepth property. For example, if ExpandDepth is 2, only the first three levels are shown (level 0, level 1, and level 2). You can also programmatically collapse and expand nodes by setting the TreeNode.Expanded property to true or false. This just scratches the surface of how a TreeView works. To get the most out of the TreeView, you need to understand how to customize several other details for a TreeNode.

Figure 16-2. Switching views with a list control If you want to give the views more descriptive names, you simply fill the list box by hand. Just make sure the order matches the order of views. There s actually no need to write this code, because the MultiView includes some built-in smarts. Like some of the rich data controls, the MultiView recognizes specific command names in button controls. (A button control is any control that implements IButtonControl, including the Button, ImageButton, and LinkButton.) If you add a button control to the view that uses one of these recognized command names, the button will have some automatic functionality. Table 16-1 lists all the recognized command names. Each command name also has a corresponding static field in the MultiView class, so you can easily get the right command name if you choose to set it programmatically. Table 16-1. Recognized Command Names for the MultiView

Figure 16-10. Breadcrumb navigation with SiteMapPath Here s how you define the SiteMapPath control: <asp:SiteMapPath ID="SiteMapPath1" runat="server" /> The SiteMapPath control is useful both for an at-a-glance view that provides the current position and for a way to move up the hierarchy. However, you always need to combine it with other navigation controls that let the user move down the site map hierarchy. The SiteMapPath control is also thoroughly customizable. Table 16-6 lists some of its most commonly configured properties. Table 16-6. SiteMapPath Appearance-Related Properties

Moves to the previous view. Moves to the next view. Moves to the view with a specific ID (string name). The ID is taken from the CommandArgument property of the button control. Moves to the view with a specific numeric index. The index is taken from the CommandArgument property of the button control.

Each node in the tree is represented by a TreeNode object. As you already know, every TreeNode has an associated piece of text, which is displayed in the tree. The TreeNode object also provides navigation properties such as ChildNodes (the collection of nodes it contains) and Parent (the containing node, one level up the tree). Along with this bare minimum, the TreeNode provides all the useful properties detailed in Table 16-9. Table 16-9. TreeNode Properties

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