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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

<ListView android:id="@+android:id/list" android:layout_width="wrap_content" android:layout_height="wrap_content"></ListView> </LinearLayout>

The text displayed in the tree for this node. The tooltip text that appears when you hover over the node text. Stores a nondisplayed value with additional data about the node (such as a unique ID you ll use when handling click events to identify the node or look up more information). If set, it automatically forwards the user to this URL when this node is clicked. Otherwise, you ll need to react to the TreeView.SelectedNodeChanged event to decide what action you want to perform.

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If the NavigateUrl property is set, this sets the target window or frame for the link. If Target isn t set, the new page is opened in the current browser window. The TreeView also exposes a Target property, which you can set to apply a default target for all TreeNode instances. The image that s displayed next to this node. The tooltip text for the image displayed next to the node.

N ote One important concept to keep in mind is that everything accomplished in Maven is the result of a plug-in

One unusual detail about the TreeNode is that it can be in one of two modes. In selection mode, clicking the node posts back the page and raises the TreeView.SelectedNodeChanged event. This is the default mode for all nodes. In navigation mode, clicking a node navigates to a new page, and the SelectedNodeChanged event is not raised. The TreeNode is placed in navigation mode as soon as you set the NavigateUrl property to anything other than an empty string. A TreeNode that s bound to site map data is in navigational mode, because each site map node supplies URL information. The next example fills a TreeView with the results of a database query. You want to use the TreeView s ability to show hierarchical data to create a master-details list. Because ASP.NET doesn t include any data source control that can query a database and expose the results as a hierarchical data source, you can t use data binding. Instead, you need to programmatically query the table and create the TreeNode structure by hand. Here s the code that implements this approach: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { DataSet ds = GetProductsAndCategories(); // Loop through the category records. foreach (DataRow row in ds.Tables["Categories"].Rows) { // Use the constructor that requires just text // and a nondisplayed value. TreeNode nodeCategory = new TreeNode( row["CategoryName"].ToString(), row["CategoryID"].ToString()); TreeView1.Nodes.Add(nodeCategory); // Get the children (products) for this parent (category). DataRow[] childRows = row.GetChildRows(ds.Relations[0]); // Loop through all the products in this category. foreach (DataRow childRow in childRows) { TreeNode nodeProduct = new TreeNode( childRow["ProductName"].ToString(), childRow["ProductID"].ToString()); nodeCategory.ChildNodes.Add(nodeProduct); }

That wraps up our sample application, which allows us to browse and select songs to play by album using the MediaStore. Using very similar methods, we could build it out so that we could browse and select music based upon artist and genre as well.

// Keep all categories collapsed (initially). nodeCategory.Collapse(); } } } Now when a node is clicked, you can handle the SelectedNodeChanged event to show the node information: protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e) { if (TreeView1.SelectedNode == null) return; if (TreeView1.SelectedNode.Depth == 0) { lblInfo.Text = "You selected Category ID: "; } else if (TreeView1.SelectedNode.Depth == 1) { lblInfo.Text = "You selected Product ID: "; } lblInfo.Text += TreeView1.SelectedNode.Value; } Figure 16-15 shows the result.

Figure 16-15. Filling a TreeView with database data A few options exist to simplify the page code in this example. One option is to bind to XML data instead of relational data. Seeing as SQL Server 2000 and later have the ability to perform XML queries with FOR XML, you could retrieve the data shaped in a specific XML markup and then bind it through the XmlDataSource control. The only trick is that because the XmlDataSource assumes you ll be binding to a file, you need to set the Data property by hand with the XML extracted from the database.

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