ICheckBoxControl 接口

定义

定义控件实现的属性和事件,用作复选框。

public interface class ICheckBoxControl
public interface ICheckBoxControl
type ICheckBoxControl = interface
Public Interface ICheckBoxControl
派生

示例

CheckBox 可实现 ICheckBoxControl。 下面的代码示例演示如何读取 属性的值 Checked 并响应 CheckedChanged 事件。


<%@ 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 CheckedChanged Example</title>
<script runat="server">
 
      void Check_Clicked(Object sender, EventArgs e) 
      {

         // Calculate the subtotal and display the result in currency format.
         // Include tax if the check box is selected.
         Message.Text = CalculateTotal(checkbox1.Checked).ToString("c");

      }

      void Page_Load(Object sender, EventArgs e)
      {

         // Display the subtotal without tax when the page is first loaded.
         if(!IsPostBack)
         {

            // Calculate the subtotal and display the result in currency format.
            Message.Text = CalculateTotal(false).ToString("c");

         }

      }

      double CalculateTotal(bool Taxable)
      {

         // Calculate the subtotal for the example.
         double Result = 1.99 + 2.99 + 3.99;

         // Add tax, if applicable.
         if(Taxable)
         {
            Result += Result * 0.086;
         }

         return Result; 

      }
 
   </script>
 
</head>
 
<body>
 
   <form id="form1" runat="server">
 
      <h3>CheckBox CheckedChanged Example</h3>

      Select whether to include tax in the subtotal.

      <br /><br />

      <table border="1" cellpadding="5">

         <tr>

            <th colspan="2">

               Shopping cart

            </th>

         </tr>

         <tr>

            <td>

               Item 1

            </td>

            <td>

               $1.99

            </td>

         </tr>

         <tr>

            <td>

               Item 2

            </td>

            <td>

               $2.99

            </td>

         </tr>

         <tr>

            <td>

               Item 3

            </td>

            <td>

               $3.99

            </td>

         </tr>

         <tr>

            <td>

               <b>Subtotal</b>

            </td>

            <td>

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

            </td>

         </tr>

         <tr>

            <td colspan="2">

               <asp:CheckBox id="checkbox1" runat="server"
                    AutoPostBack="True"
                    Text="Include 8.6% sales tax"
                    TextAlign="Right"
                    OnCheckedChanged="Check_Clicked"/>

            </td>

         </tr>

      </table>
                   
   </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 CheckedChanged Example</title>
<script runat="server">
 
      Sub Check_Clicked(sender As Object, e As EventArgs) 

         ' Calculate the subtotal and display the result in currency format.
         ' Include tax if the check box is selected.
         Message.Text = CalculateTotal(checkbox1.Checked).ToString("c")

      End Sub

      Sub Page_Load(sender As Object, e As EventArgs)

         ' Display the subtotal without tax when the page is first loaded.
         If Not IsPostBack Then

            ' Calculate the subtotal and display the result in currency format.
            Message.Text = CalculateTotal(false).ToString("c")

         End If

      End Sub

      Function CalculateTotal(Taxable As Boolean) As Double 

         ' Calculate the subtotal for the example.
         Dim Result As Double = 1.99 + 2.99 + 3.99

         ' Add tax, if applicable.
         If(Taxable)

            Result += Result * 0.086
         
         End If

         Return Result 

      End Function
 
   </script>
 
</head>
 
<body>
 
   <form id="form1" runat="server">
 
      <h3>CheckBox CheckedChanged Example</h3>

      Select whether to include tax in the subtotal.

      <br /><br />

      <table border="1" cellpadding="5">

         <tr>

            <th colspan="2">

               Shopping cart

            </th>

         </tr>

         <tr>

            <td>

               Item 1

            </td>

            <td>

               $1.99

            </td>

         </tr>

         <tr>

            <td>

               Item 2

            </td>

            <td>

               $2.99

            </td>

         </tr>

         <tr>

            <td>

               Item 3

            </td>

            <td>

               $3.99

            </td>

         </tr>

         <tr>

            <td>

               <b>Subtotal</b>

            </td>

            <td>

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

            </td>

         </tr>

         <tr>

            <td colspan="2">

               <asp:CheckBox id="checkbox1" runat="server"
                    AutoPostBack="True"
                    Text="Include 8.6% sales tax"
                    TextAlign="Right"
                    OnCheckedChanged="Check_Clicked"/>

            </td>

         </tr>

      </table>
                   
   </form>
         
</body>

</html>

注解

接口ICheckBoxControl定义 属性和 事件,控件必须实现这些属性和事件才能在网页上充当检查框。 属性Checked可用于确定是选中检查框还是以编程方式设置属性。 当 CheckedChanged 值在 Checked 服务器的帖子之间发生更改时,将引发 该事件。

属性

Checked

获取或设置 ICheckBoxControl 控件的值,指示是否已选中该控件。

事件

CheckedChanged

Checked 属性的值在向服务器发送期间更改时发生。

适用于