共用方式為

PlaceHolder Web 伺服器控制項

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:PlaceHolderid="PlaceHolder1"      runat="server"/>

備註

使用 PlaceHolder 控制項作為容器，來存放以動態方式加入至網頁的伺服器控制項。PlaceHolder 控制項不會產生任何看得見的輸出，只是用來作為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

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

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

   <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>

<html>
<body>
   <form runat="Server">
      <h3>PlaceHolder Example</h3>

      <asp:PlaceHolder id="PlaceHolder1" 
           runat="server"/>
   </form>
</body>
</html>
[C#]
<%@ Page Language="C#" AutoEventWireup="True" %>

   <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>

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

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

請參閱

Web 伺服器控制項 | PlaceHolder 類別

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