HtmlInputCheckBox.ServerChange 事件
定义
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。
当将网页提交给服务器并且 HtmlInputCheckBox 控件更改了以前张贴的状态时发生。
public:
event EventHandler ^ ServerChange;public event EventHandler ServerChange;member this.ServerChange : EventHandler Public Custom Event ServerChange As EventHandler 事件类型
示例
下面的代码示例演示如何为 ServerChange 事件指定处理程序并为其编写代码。
<%@ 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>HtmlInputCheckBox Sample</title>
<script language="C#" runat="server">
void Button1_Click(object sender, EventArgs e)
{
if (Prev_Check_State.Value == Check1.Checked.ToString())
Span2.InnerHtml = "CheckBox1 did not change state between clicks.";
if (Check1.Checked == true)
{
Span1.InnerHtml = "CheckBox1 is selected!";
Prev_Check_State.Value="True";
}
else
{
Span1.InnerHtml = "CheckBox1 is not selected!";
Prev_Check_State.Value="False";
}
}
void Server_Changed(object sender, EventArgs e)
{
Span2.InnerHtml = "CheckBox1 changed state between clicks.";
}
</script>
</head>
<body>
<h3>HtmlInputCheckBox Sample</h3>
<form id="form1" runat="server">
<input id="Check1"
type="checkbox"
onserverchange="Server_Changed"
runat="server"/>
CheckBox1
<span id="Span1"
style="color:red"
runat="server"/>
<br />
<input type="button"
id="Button1"
value="Enter"
onserverclick="Button1_Click"
runat="server"/>
<br /><br />
<span id="Span2"
runat="server"/>
<input type="hidden" id="Prev_Check_State"
visible="false"
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>HtmlInputCheckBox Sample</title>
<script language="VB" runat="server">
Sub Button1_Click(sender As Object, e As EventArgs)
If Prev_Check_State.Value = Check1.Checked.ToString() Then
Span2.InnerHtml = "CheckBox1 did not change state between clicks."
End If
If Check1.Checked = True Then
Span1.InnerHtml = "CheckBox1 is selected!"
Prev_Check_State.Value = "True"
Else
Span1.InnerHtml = "CheckBox1 is not selected!"
Prev_Check_State.Value = "False"
End If
End Sub 'Button1_Click
Sub Server_Changed(sender As Object, e As EventArgs)
Span2.InnerHtml = "CheckBox1 changed state between clicks."
End Sub 'Server_Changed
</script>
</head>
<body>
<h3>HtmlInputCheckBox Sample</h3>
<form id="form1" runat="server">
<input id="Check1"
type="checkbox"
onserverchange="Server_Changed"
runat="server"/>
CheckBox1
<span id="Span1"
style="color:red"
runat="server"/>
<br />
<input type="button"
id="Button1"
value="Enter"
onserverclick="Button1_Click"
runat="server"/>
<br /><br />
<span id="Span2"
runat="server"/>
<input type="hidden" id="Prev_Check_State"
visible="false"
runat="server"/>
</form>
</body>
</html>
注解
将网页提交到服务器且 HtmlInputCheckBox 控件更改上一篇文章的状态时，将引发此事件。
注意
控件必须启用视图状态， ServerChange 事件才能正常工作。
有关如何处理事件的详细信息，请参阅 处理和引发事件。
