Button 构造函数
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
初始化 Button 类的新实例。
public:
Button();C#
public Button();Public Sub New ()下面的代码示例演示如何创建和初始化 类的新实例 Button 。
ASP.NET (C#)
<%@ 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> Button Constructor Example </title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// Create a new Button control.
Button NewButton = new Button();
NewButton.Text="Click Me";
// Register the event-handling method for the Click event.
NewButton.Click += new EventHandler(this.Button_Click);
// Add the control to the Controls collection of the
// PlaceHolder control.
Place.Controls.Clear();
Place.Controls.Add(NewButton);
}
void Button_Click(Object sender, EventArgs e)
{
Message.Text = "Hello World";
}
</script>
</head>
<body>
<form id="form1" runat="server">
<h3> Button Constructor Example </h3>
<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> Button Constructor Example </title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
' Create a new Button control.
Dim NewButton As Button = New Button()
NewButton.Text="Click Me"
' Register the event-handling method for the Click event.
AddHandler NewButton.Click, AddressOf Button_Click
' Add the control to the Controls collection of the
' PlaceHolder control.
Place.Controls.Clear()
Place.Controls.Add(NewButton)
End Sub
Sub Button_Click(sender as Object, e As EventArgs)
Message.Text = "Hello World"
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
<h3> Button Constructor Example </h3>
<asp:Placeholder id="Place"
runat="server"/>
<br /><br />
<asp:Label id="Message"
runat="server"/>
</form>
</body>
</html>
使用此构造函数创建和初始化 类的新实例 Button 。
| 产品 | 版本 |
|---|---|
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
