ImageButton.Command 事件

定义

在单击 ImageButton 时发生。

public:
 event System::Web::UI::WebControls::CommandEventHandler ^ Command;
public:
 virtual event System::Web::UI::WebControls::CommandEventHandler ^ Command;
public event System.Web.UI.WebControls.CommandEventHandler Command;
member this.Command : System.Web.UI.WebControls.CommandEventHandler 
Public Custom Event Command As CommandEventHandler 

事件类型

实现

示例

下面的示例演示如何为 事件指定和编码处理程序, Command 以确定单击哪个 ImageButton 控件。

注意

下面的代码示例使用单文件代码模型,如果直接复制到代码隐藏文件中,可能无法正常工作。 此代码示例必须复制到扩展名为 .aspx 的空文本文件中。 有关 Web 窗体代码模型的详细信息,请参阅 ASP.NET Web 窗体页代码模型

<%@ 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>
    <title>ImageButton CommandName Sample</title>
<script language="C#" runat="server">

      void ImageButton_Command(object sender, CommandEventArgs e) 
      {
         if (e.CommandName == "Sort" && e.CommandArgument == "Ascending")
            Label1.Text = "You clicked the Sort Ascending Button";
         else
            Label1.Text = "You clicked the Sort Descending Button";
      }

   </script>

</head>

<body>

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

      <h3>ImageButton CommandName Sample</h3>

      Click an image.<br /><br />

      <asp:ImageButton id="imagebutton1" runat="server"
           AlternateText="Sort Ascending"
           ImageUrl="images/pict.jpg"
           OnCommand="ImageButton_Command"
           CommandName="Sort"
           CommandArgument="Ascending"/>

      <asp:ImageButton id="imagebutton2" runat="server"
           AlternateText="Sort Descending"
           ImageUrl="image/pict2.jpg"
           OnCommand="ImageButton_Command"
           CommandName="Sort"
           CommandArgument="Descending"/>

      <br /><br />
    
      <asp:label id="Label1" 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>
    <title>ImageButton CommandName Sample</title>
<script language="VB" runat="server">

      Sub ImageButton_Command(sender As Object, e As CommandEventArgs) 
         If (e.CommandName = "Sort") And (e.CommandArgument = "Ascending") Then
            Label1.Text = "You clicked the Sort Ascending Button"
         Else
            Label1.Text = "You clicked the Sort Descending Button"
         End If
      End Sub

   </script>

</head>

<body>

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

      <h3>ImageButton CommandName Sample</h3>

      Click an image.<br /><br />

      <asp:ImageButton id="imagebutton1" runat="server"
           AlternateText="Sort Ascending"
           ImageUrl="images/pict.jpg"
           OnCommand="ImageButton_Command"
           CommandName="Sort"
           CommandArgument="Ascending"/>

      <asp:ImageButton id="imagebutton2" runat="server"
           AlternateText="Sort Descending"
           ImageUrl="images/pict2.jpg"
           OnCommand="ImageButton_Command"
           CommandName="Sort"
           CommandArgument="Descending"/>

      <br /><br />
    
      <asp:label id="Label1" runat="server"/>

   </form>

</body>
</html>

注解

单击 Command 控件 ImageButton 时引发 事件。

注意

事件 Command 通过控件层次结构以 的形式 BubbleEvent引发。

注意

此事件会导致页面回发到服务器。

有关处理事件的详细信息,请参阅 如何:在 Web 窗体应用程序中使用事件

适用于

另请参阅