Fly TreeView 教程

时间：2010-09-09 来源：情缘鸟

 1 <%@ Register Assembly="NineRays.WebControls.FlyTreeView" Namespace="NineRays.WebControls"
 2     TagPrefix="NineRays" %>
 3 
 4  <NineRays:FlyTreeView ID="flyTreeView" runat="server" BorderColor="Silver" BorderWidth="1px"
 5                     Height="320px" Width="280px" Padding="3px" OnPopulateNodes="flyTreeView_PopulateNodes"
 6                     FadeEffect="True" Style="display: block" BackColor="White" ImageSet="Vista" DrawLines="False">
 7                     <HoverStyle Font-Underline="True" />
 8                     <SelectedStyle BackColor="#D6F0FD" BorderColor="#9ADFFE" BorderStyle="Solid" BorderWidth="1px"
 9                         Padding="2px;6px;6px;2px" />
10                     <DefaultStyle Font-Names="Tahoma" Font-Size="11px" ForeColor="Black" ImageUrl="$vista_folder"
11                         Padding="3px;7px;7px;3px" RowHeight="18px" />
12                 </NineRays:FlyTreeView>
13

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            AddNodes(flyTreeView.Nodes, string.Empty);
        }

    }

    protected void flyTreeView_PopulateNodes(object sender, NineRays.WebControls.FlyTreeNodeEventArgs e)
    {
        AddNodes(e.Node.ChildNodes, e.Node.Value.ConvertType(0));
    }


    private const string ROOT_FOLDER = @"C:\";

    protected void AddNodes(FlyTreeNodeCollection nodes, string path)
    {
        string folder = Path.Combine(ROOT_FOLDER, path);
        DirectoryInfo directory = new DirectoryInfo(Path.Combine(ROOT_FOLDER, path));
        if (!directory.Exists) return;
        DirectoryInfo[] subDirectories = directory.GetDirectories();
        foreach (DirectoryInfo subDir in subDirectories)
        {
            FlyTreeNode ftn = new FlyTreeNode();
            ftn.Text = HttpUtility.HtmlEncode(subDir.Name);
            ftn.Value = subDir.Name;
            nodes.Add(ftn);
            try
            {
                // do not set populate on demand for nodes that have no nested directories
                ftn.PopulateNodesOnDemand = subDir.GetDirectories().Length > 0;
            }
            catch (Exception ex)
            {
                // add a child node that shows that there was an exception trying to get its child nodes
                AddExceptionNode(ftn.ChildNodes, ex);
            }

        }
    }

    protected void AddExceptionNode(FlyTreeNodeCollection nodes, Exception ex)
    {
        FlyTreeNode ftn = new FlyTreeNode();
        ftn.Text = HttpUtility.HtmlEncode(ex.Message);
        ftn.NodeTypeID = "errorType";
        nodes.Add(ftn);
    }