Button.Click 事件
定义
重要
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在单击 Button 控件时发生。
public:
event EventHandler ^ Click;public:
virtual event EventHandler ^ Click;public event EventHandler Click;member this.Click : EventHandler Public Custom Event Click As EventHandler 事件类型
实现
示例
下面的代码示例演示如何为 Click 事件指定和编码事件处理程序，以便在单击控件时 Button 在网页上显示消息。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// Manually register the event-handling method for
// the Click event of the Button control.
Button1.Click += new EventHandler(this.GreetingBtn_Click);
}
void GreetingBtn_Click(Object sender,
EventArgs e)
{
// When the button is clicked,
// change the button text, and disable it.
Button clickedButton = (Button)sender;
clickedButton.Text = "...button clicked...";
clickedButton.Enabled = false;
// Display the greeting label text.
GreetingLabel.Visible = true;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Simple Button Example</h3>
<asp:Button id="Button1"
Text="Click here for greeting..."
OnClick="GreetingBtn_Click"
runat="server"/>
<br />
<br />
<asp:Label ID="GreetingLabel" runat="server"
Visible="false" Text="Hello World!" />
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub GreetingBtn_Click(ByVal sender As Object, _
ByVal e As EventArgs)
' When the button is clicked,
' change the button text, and disable it.
Dim clickedButton As Button = sender
clickedButton.Text = "...button clicked..."
clickedButton.Enabled = False
' Display the greeting label text.
GreetingLabel.Visible = True
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Button Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>Simple Button Example</h3>
<asp:Button id="Button1"
Text="Click here for greeting..."
OnClick="GreetingBtn_Click"
runat="server"/>
<br />
<br />
<asp:Label ID="GreetingLabel" runat="server"
Visible="false" Text="Hello World!" />
</div>
</form>
</body>
</html>
注解
单击 Click 控件时， Button 将引发 事件。 当没有命令名称与 Button 控件 (（例如“提交”按钮) ）关联时，通常使用此事件。
有关处理事件的详细信息，请参阅 处理和引发事件。
