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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="回发测试" onclick="Button1_Click" /> <asp:Button ID="Button2"
runat="server" Text="创建树" onclick="Button2_Click" />
<hr />
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</form>
</body>
</html>
using System;
using System.Drawing;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (ViewState["treeview"] != null && (bool)ViewState["treeview"])
PlaceHolder1.Controls.Add(new TreeView { ID = "myTestTree" });
}
protected void Button1_Click(object sender, EventArgs e)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
PlaceHolder1.Controls.Clear();
var tr = new TreeView { ID = "myTestTree" };
PlaceHolder1.Controls.Add(tr);
tr.ShowLines = true;
tr.SelectedNodeStyle.BackColor= Color.LightCyan;
var n = new TreeNode { Text = "n1" };
tr.Nodes.Add(n);
n = new TreeNode { Text = "n2" };
tr.Nodes.Add(n);
var m = new TreeNode { Text = "n3" };
n.ChildNodes.Add(m);
ViewState["treeview"] = true;
}
}