Asp.net 2.0 Treeview 无限级无刷新示例 在运行时添加控件.
<%@ Import Namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
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=632242003305625000"; }
node.ChildNodes.Add(subNode);
}
foreach (FileInfo fi in directory.GetFiles())
{
TreeNode subNode = new TreeNode(fi.Name);
node.ChildNodes.Add(subNode);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body bgcolor="white">
<form id="form1" runat="server">
<div>
<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>
</div>
</form>
</body>
</html>
本示例在运行时将文本框和按钮添加到 Web 窗体页。它还将事件处理程序动态绑定到按钮的 Click 事件。该处理程序会显示动态生成的文本框的值。
这些控件被添加到 Panel Web 服务器控件中,该控件是一个占位符。在面板中使用分行符(HTML <BR> 元素)来分隔这些控件,它们被添加到使用 LiteralControl 控件的面板中。
示例
private void Page_Load(object sender, System.EventArgs e)
{
if (!IsPostBack)
AddControls();
}
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
if (ViewState["controsladded"] == null)
AddControls();
}
private void AddControls()
{
TextBox dynamictextbox = new TextBox();
dynamictextbox.Text = "(Enter some text)";
dynamictextbox.ID = "dynamictextbox";
Button dynamicbutton = new Button();
dynamicbutton.Click += new System.EventHandler(dynamicbutton_Click);
dynamicbutton.Text = "Dynamic Button";
Panel1.Controls.Add(dynamictextbox);
Panel1.Controls.Add(new LiteralControl("<BR>"));
Panel1.Controls.Add(new LiteralControl("<BR>"));
Panel1.Controls.Add(dynamicbutton);
ViewState["controlsadded"] = true;
}
private void dynamicbutton_Click(Object sender, System.EventArgs e)
{
TextBox tb = new TextBox();
tb = (TextBox) (Panel1.FindControl("dynamictextbox"));
Label1.Text = tb.Text;
}