ControlCollection 定义变量 controls 。這個是頁面所有控件的集合 ，controls 包含層次 每一層有各個控件（這裡我不知道一共是有兩層還是有多層。等下繼續研究，先寫一下再说） 。第0層 第一个是ctl00 第0層第二個就是
這個也是第 0層的 frm .這個 子层次 包含空控件就会在这里显示。 如下的效果就是。（本人把控件类型改成ID了方便我识别）
下面是C#代码
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class ControlTree : System.Web.UI.Page
{
protected void Page_Load(object sender, System.EventArgs e)
{
// Start examining all the controls.
DisplayControl(Page.Controls, 0);
// Add the closing horizontal line.
Response.Write("<hr />");
}
private void DisplayControl(ControlCollection controls, int depth)
{
foreach (Control control in controls)
{
// Use the depth parameter to indent the control tree.
Response.Write(new String('-', depth * 4) + "> ");
// Display this control.
Response.Write( depth+ control.ClientID.ToString() + " - <b>" +
control.ID + "</b><br />");
//if (control is LiteralControl)
//{
// // Display the literal content (whitespace and all).
// string text = ((LiteralControl)control).Text;
// Response.Write("Text: " + Server.HtmlEncode(text));
//}
if (control.Controls != null)
{
DisplayControl(control.Controls, depth + 1);
}
}
}
}
//下面是頁面代碼，需要的可以拿過來試一下。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ControlTree.aspx.cs" Inherits="ControlTree" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head >
<title>Controls</title>
</head>
<body>
<p><i>This is static HTML (not a web control).</i></p>
<form id="frm" method="post" runat="server">
<div>
<asp:panel id="MainPanel" runat="server" Height="112px">
<p><asp:Button id="Button1" runat="server" Text="Button1"/>
<asp:Button id="Button2" runat="server" Text="Button2"/>
<asp:Button id="Button3" runat="server" Text="Button3"/></p>
<p><asp:Label id="Label1" runat="server" Width="48px">
Name:</asp:Label>
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox></p>
</asp:panel>
<p><asp:Button id="Button4" runat="server" Text="Button4"/></p>
</div>
</form>
<p><i>This is static HTML (not a web control).</i></p>
</body>
</html>