PlaceHolder ,他个Panel用法上差 不多,但是他不会产生DIV 这样的HTML代码,你加进去的控件是什么就什么,不会产生额外的HTML 代码.
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<%
@ Page Language="C#" AutoEventWireup="true" CodeFile="panel_PlaceHolder.aspx.cs" Inherits="panel_PlaceHolder" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<head runat="server">
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<title>无标题页</title>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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================== Panel ==========<br />
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<asp:Panel ID="Panel1" runat="server" BackColor="#FFE0C0" Height="50px" Width="125px">
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</asp:Panel>
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<br />
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添加<asp:DropDownList ID="DropDownList1" runat="server" Width="96px">
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</asp:DropDownList>个到文本标签<br />
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添加<asp:DropDownList ID="DropDownList2" runat="server" Width="95px">
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</asp:DropDownList>个到文本框<br />
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添加<asp:TextBox ID="txt" runat="server" Width="88px"></asp:TextBox>进去(文字)<br />
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<asp:Button ID="AddToPanel" runat="server" OnClick="AddToPanel_Click" Text="添加进去" />
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<asp:CheckBox ID="YcPanel" runat="server" AutoPostBack="True" OnCheckedChanged="YcPanel_CheckedChanged"
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Text="隐藏 Panel" /><br />
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=================================<br />
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<br />
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=================== PlaceHolder =====<br />
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<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
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<br />
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<br />
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<asp:Button ID="Button1" runat="server" Text="AddToPlaceHolder" OnClick="Button1_Click" /><br />
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<br />
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=================================<br />
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</div>
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</form>
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</body>
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</html>
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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public partial class panel_PlaceHolder : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!Page.IsPostBack)
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{
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for (int i = 1; i <= 3;i++ )
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{
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this.DropDownList1.Items.Add(i.ToString());
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this.DropDownList2.Items.Add(i.ToString());
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}
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}
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}
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protected void AddToPanel_Click(object sender, EventArgs e)
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{
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//注意 a 的取值方法.
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int a = int.Parse(this.DropDownList1.SelectedItem.Value);
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for (int i = 1; i <= a; i++)
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{
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Label lb = new Label();
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lb.ID = "lb" + i.ToString();
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lb.Text = "高峰" + i.ToString()+"<br>";
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Panel1.Controls.Add(lb);
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}
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//注意 b 的取值.
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int b = int.Parse(this.DropDownList2.SelectedItem.Value);
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for (int i = 1; i <= b;i++ )
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{
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TextBox tb = new TextBox();
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tb.ID = "tb" + i.ToString();
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tb.Text = "高峰" + i.ToString();
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Literal lt = new Literal();
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lt.Text = "<br>";
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//添加到 Panel 中
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Panel1.Controls.Add(tb);
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Panel1.Controls.Add(lt);
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}
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Literal ltr = new Literal();
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ltr.Text = this.txt.Text;
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Panel1.Controls.Add(ltr);
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}
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protected void YcPanel_CheckedChanged(object sender, EventArgs e)
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{
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if (this.YcPanel.Checked)
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{
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this.Panel1.Visible = false;
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this.YcPanel.Text = "显示 Panel";
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}
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else
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{
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this.Panel1.Visible = true;
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this.YcPanel.Text = "隐藏 Panel";
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}
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}
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protected void Button1_Click(object sender, EventArgs e)
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{
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HtmlButton hbt = new HtmlButton();
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hbt.InnerText = "我是一个 Html 按钮!";
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Literal lt = new Literal();
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lt.Text = "<br>";
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Button bt = new Button();
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bt.Text = "我是一个 服务器 按钮";
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//然后将这三个控件添加到 PlaceHolder 中
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this.PlaceHolder1.Controls.Add(hbt);
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this.PlaceHolder1.Controls.Add(lt);
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this.PlaceHolder1.Controls.Add(bt);
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}
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}
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