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PlaceHolder Web 伺服器控制項宣告式語法

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更新：2007 年 11 月

在網頁的控制項階層架構中為使用程式設計方式加入的控制項保留一個位置。

 <asp:PlaceHolder     EnableTheming="True|False"     EnableViewState="True|False"     ID="string"     OnDataBinding="DataBinding event handler"     OnDisposed="Disposed event handler"     OnInit="Init event handler"     OnLoad="Load event handler"     OnPreRender="PreRender event handler"     OnUnload="Unload event handler"     runat="server"     SkinID="string"     Visible="True|False" />

備註

使用 PlaceHolder 控制項做為容器，以存放動態加入 Web 網頁的伺服器控制項。PlaceHolder 控制項不會產生任何可見的輸出，而只是用來做為 Web 網頁上其他控制項的容器。您可以使用 Control.Controls 集合，從 PlaceHolder 控制項加入、插入或移除控制項。

範例

下列範例示範如何將 Web 伺服器控制項加入至 PlaceHolder 控制項。

<%@ Page Language="VB" AutoEventWireup="True" %>

<!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>
    <title>PlaceHolder Example</title>
<script runat="server">

      Sub Page_Load(Sender As Object, e As EventArgs)

         Dim myButton As HtmlButton = New HtmlButton()

         myButton.InnerText = "Button 1"
         PlaceHolder1.Controls.Add(myButton)

         myButton = New HtmlButton()
         myButton.InnerText = "Button 2"
         PlaceHolder1.Controls.Add(myButton)

         myButton = New HtmlButton()
         myButton.InnerText = "Button 3"
         PlaceHolder1.Controls.Add(myButton)

         myButton = New HtmlButton()
         myButton.InnerText = "Button 4"
         PlaceHolder1.Controls.Add(myButton)

      End Sub

   </script>

</head>

<body>
   <form id="form1" runat="server">
      <h3>PlaceHolder Example</h3>

      <asp:PlaceHolder id="PlaceHolder1" 
           runat="server"/>
   </form>
</body>
</html>


<%@ Page Language="C#" AutoEventWireup="True" %>

<!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>
    <title>PlaceHolder Example</title>
<script runat="server">

      void Page_Load(Object sender, EventArgs e)
      {
         HtmlButton myButton = new HtmlButton();

         myButton.InnerText = "Button 1";
         PlaceHolder1.Controls.Add(myButton);

         myButton = new HtmlButton();
         myButton.InnerText = "Button 2";
         PlaceHolder1.Controls.Add(myButton);

         myButton = new HtmlButton();
         myButton.InnerText = "Button 3";
         PlaceHolder1.Controls.Add(myButton);

         myButton = new HtmlButton();
         myButton.InnerText = "Button 4";
         PlaceHolder1.Controls.Add(myButton);
      }

   </script>

</head>

<body>
   <form id="form1" runat="server">
      <h3>PlaceHolder Example</h3>

      <asp:PlaceHolder id="PlaceHolder1" 
           runat="server"/>
   </form>
</body>
</html>

請參閱

參考

PlaceHolder

其他資源

Web 伺服器控制項語法