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CheckBox 建構函式

  • 參考

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

初始化 CheckBox 類別的新執行個體。

public:
 CheckBox();
public CheckBox ();
Public Sub New ()

範例

注意

下列程式代碼範例會使用單一檔案程式代碼模型，如果直接複製到程式代碼後置檔案，可能無法正常運作。 此程式代碼範例必須複製到具有.aspx擴展名的空白文本檔。 如需 Web Forms 程式代碼模型的詳細資訊，請參閱 ASP.NET Web Forms 頁面代碼模型。


<%@ 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 runat="server">
    <title> CheckBox Constructor Example </title>
<script runat="server">

      void Page_Load(Object sender, EventArgs e)
      {

         // Create new CheckBox control.
         CheckBox NewCheckBox = new CheckBox();
         NewCheckBox.ID="FeatureCheckBox";
         NewCheckBox.Text="Enable feature";
         NewCheckBox.AutoPostBack = true;

         // Register the event-handling method for the CheckedChanged event. 
         NewCheckBox.CheckedChanged += new EventHandler(this.Check_Change);

         // Add the control to the Controls collection of the
         // PlaceHolder control. 
         Place.Controls.Clear();
         Place.Controls.Add(NewCheckBox);

      }

      void Check_Change(Object sender, EventArgs e)
      {

         // Retrieve the CheckBox control from the PlaceHolder control.
         CheckBox check = (CheckBox)Place.FindControl("FeatureCheckBox");

         // Display the appropriate message based on the state of the
         // CheckBox control. 
         if(check.Checked)
         {
            Message.Text = "Feature enabled.";
         }
         else
         {
            Message.Text = "Feature disabled.";
         }

      }

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3> CheckBox Constructor Example </h3>

      Click the check box.

      <br /><br />

      <asp:Placeholder id="Place" 
           runat="server"/>

      <br /><br />

      <asp:Label id="Message" 
           runat="server"/>

   </form>

</body>

</html>


<%@ 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 runat="server">
    <title> CheckBox Constructor Example </title>
<script runat="server">

      Sub Page_Load(sender As Object, e As EventArgs)

         ' Create new CheckBox control.
         Dim NewCheckBox As CheckBox = New CheckBox()
         NewCheckBox.ID="FeatureCheckBox"
         NewCheckBox.Text="Enable feature"
         NewCheckBox.AutoPostBack = True

         ' Register the event handling method for the CheckedChanged event. 
         AddHandler NewCheckBox.CheckedChanged, AddressOf Check_Change

         ' Add the control to the Controls collection of the
         ' PlaceHolder control. 
         Place.Controls.Clear()
         Place.Controls.Add(NewCheckBox)

      End Sub

      Sub Check_Change(sender As Object, e As EventArgs)

         ' Retrieve the CheckBox control from the PlaceHolder control.
         Dim check As CheckBox = _
            CType(Place.FindControl("FeatureCheckBox"), CheckBox)

         ' Display the appropriate message based on the state of the
         ' CheckBox control. 
         If check.Checked Then
         
            Message.Text = "Feature enabled."
     
         Else
         
            Message.Text = "Feature disabled."
         
         End If


      End Sub

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3> CheckBox Constructor Example </h3>

      Click the check box.

      <br /><br />

      <asp:Placeholder id="Place" 
           runat="server"/>

      <br /><br />

      <asp:Label id="Message" 
           runat="server"/>

   </form>

</body>

</html>

備註

使用此建構函式來建立和初始化 類別的新實例 CheckBox 。

適用於