3.10 向 Default.aspx 页面上添加 TreeView 控件：

<asp:TreeView ID="trvLocation" runat="server" Font-Size="12px"  

    ShowLines="True">  

</asp:TreeView>  

3.11 在 Default.aspx 页面后置代码中编写 BindData 数据绑定方法：

private void BindData()  

{  

    DAO dao = new DAO();  

 

    LocationCollection locs = dao.GetLocations();  

 

    TreeNodeCollection nodes = CreateTreeNodes(locs);  

 

    foreach (TreeNode node in nodes)  

    {  

        trvLocation.Nodes.Add(node);  

    }  

}  

3.12 BindData 方法调用了 CreateTreeNode 方法返回节点集合，该方法中递归调用自身以得到全部所在地节点：

private TreeNodeCollection CreateTreeNodes(LocationCollection locs)  

{  

    TreeNodeCollection nodeColl = new TreeNodeCollection();  

 

    foreach (Location loc in locs)  

    {  

        TreeNode node = new TreeNode(loc.Name, loc.Id.ToString());  

         

        if (loc.SubLocations.Count > 0)  

        {  

            TreeNodeCollection subColl = CreateTreeNodes(loc.SubLocations);  

 

            foreach (TreeNode subNode in subColl)  

                node.ChildNodes.Add(subNode);  

        }  

 

        nodeColl.Add(node);  

    }  

 

    return nodeColl;  

}  

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