Treeview 无限级无刷新示例

最新推荐文章于 2022-02-25 21:57:21 发布

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最新推荐文章于 2022-02-25 21:57:21 发布

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本文链接：https://blog.youkuaiyun.com/pupstar/article/details/1516725

本文介绍如何使用 ASP.NET 中的 TreeView 控件来动态加载文件系统目录结构，并展示了具体的实现代码。通过设置 TreeNode 的属性，可以实现节点的展开、选择行为以及自定义样式。

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*.aspx页面：

<asp:treeview ID="Treeview1" runat="server" ImageSet="XPFileExplorer" AutoGenerateDataBindings="false" ExpandDepth=0
        OnTreeNodePopulate="Treeview1_TreeNodePopulate"
    >
        <SelectedNodeStyle BackColor="#B5B5B5"></SelectedNodeStyle>
        <Nodes>
            <asp:TreeNode Value="C:" Text="C:" PopulateOnDemand="true" SelectAction="Select" NavigateUrl="#" >
            </asp:TreeNode>
        </Nodes>
        <NodeStyle VerticalPadding="2" Font-Names="Tahoma" Font-Size="8pt" HorizontalPadding="2"
            ForeColor="Black"></NodeStyle>
        <HoverNodeStyle Font-Underline="True" ForeColor="#6666AA"></HoverNodeStyle>
    </asp:treeview>

.aspx.cs 代码：

protected void Page_Load(object sender, EventArgs e)
    {

    }

    public void Treeview1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
    {
        if (IsCallback)
            if (e.Node.ChildNodes.Count == 0)
            {
                LoadChildNode(e.Node);
            }

    }

    private void LoadChildNode(TreeNode node)
    {

        DirectoryInfo directory;
        directory = new DirectoryInfo(node.Value);

        foreach (DirectoryInfo sub in directory.GetDirectories())
        {

            TreeNode subNode = new TreeNode(sub.Name);
            subNode.Value = sub.FullName;

            try
            {
                if (sub.GetDirectories().Length > 0 || sub.GetFiles().Length > 0)
                {
                    subNode.SelectAction = TreeNodeSelectAction.SelectExpand;
                    subNode.PopulateOnDemand = true;
                    subNode.NavigateUrl = "#";
                }
            }
            catch { subNode.ImageUrl = "WebResource.axd?a=s&r=TreeView_XP_Explorer_ParentNode.gif&t=632242003305625000xx"; }
            node.ChildNodes.Add(subNode);

        }

        foreach (FileInfo fi in directory.GetFiles())
        {
            TreeNode subNode = new TreeNode(fi.Name);
            node.ChildNodes.Add(subNode);
        }
}