MonthChangedEventHandler 委托
表示处理 Calendar 控件的 VisibleMonthChanged 事件的方法。
**命名空间:**System.Web.UI.WebControls
**程序集:**System.Web（在 system.web.dll 中）
语法
声明
Public Delegate Sub MonthChangedEventHandler ( _
sender As Object, _
e As MonthChangedEventArgs _
)
用法
Dim instance As New MonthChangedEventHandler(AddressOf HandlerMethod)
public delegate void MonthChangedEventHandler (
Object sender,
MonthChangedEventArgs e
)
public delegate void MonthChangedEventHandler (
Object^ sender,
MonthChangedEventArgs^ e
)
/** @delegate */
public delegate void MonthChangedEventHandler (
Object sender,
MonthChangedEventArgs e
)
JScript 支持使用委托，但不支持进行新的声明。
参数
- sender
事件源。
- e
包含事件数据的 MonthChangedEventArgs。
备注
当用户在 Calendar 控件的导航控件上单击以显示下个月或上个月时，将引发 VisibleMonthChanged 事件。
当创建 MonthChangedEventHandler 委托时，将标识处理事件的方法。若要使该事件与事件处理程序相关联，请将该委托的一个实例添加到事件中。除非移除了该委托，否则每当发生该事件时就调用事件处理程序。有关事件处理程序委托的更多信息，请参见 事件和委托。
示例
下面的代码示例演示如何为 VisibleMonthChanged 事件指定和编写处理程序，以在 Label 控件中显示 Calendar 控件是向前移动了一个月还是向后移动了一个月。
<%@ Page Language="VB" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">
Sub MonthChange(sender As Object, e As MonthChangedEventArgs)
If e.NewDate.Month > e.PreviousDate.Month Then
Message.Text = "You moved forward one month."
Else
Message.Text = "You moved backwards one month."
End If
End Sub
</script>
</head>
<body>
<form runat="server">
<h3> Calendar VisibleMonthChanged Example </h3>
Select a different month on the calendar.
<br><br>
<asp:Calendar id="Calendar1" runat="server"
OnVisibleMonthChanged="MonthChange">
<WeekendDayStyle BackColor="gray">
</WeekendDayStyle>
</asp:Calendar>
<hr>
<table border="1">
<tr bgcolor="Silver">
<th>
Month navigation direction
</th>
</tr>
<tr>
<td>
<asp:Label id="Message"
Text="Starting Month."
runat="server"/>
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">
void MonthChange(Object sender, MonthChangedEventArgs e)
{
if (e.NewDate.Month > e.PreviousDate.Month)
{
Message.Text = "You moved forward one month.";
}
else
{
Message.Text = "You moved backwards one month.";
}
}
</script>
</head>
<body>
<form runat="server">
<h3> Calendar VisibleMonthChanged Example </h3>
Select a different month on the calendar.
<br><br>
<asp:Calendar id="Calendar1" runat="server"
OnVisibleMonthChanged="MonthChange">
<WeekendDayStyle BackColor="gray">
</WeekendDayStyle>
</asp:Calendar>
<hr>
<table border="1">
<tr bgcolor="Silver">
<th>
Month navigation direction
</th>
</tr>
<tr>
<td>
<asp:Label id="Message"
Text="Starting month."
runat="server"/>
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">
Sub MonthChange(sender As Object, e As MonthChangedEventArgs)
If e.NewDate.Month > e.PreviousDate.Month Then
Message.Text = "You moved forward one month."
Else
Message.Text = "You moved backwards one month."
End If
End Sub
Sub Page_Load(sender As Object, e As EventArgs)
' Manually register the event-handling method for the
' VisibleMonthChanged event of the Calendar control.
AddHandler Calendar1.VisibleMonthChanged, AddressOf MonthChange
End Sub
</script>
</head>
<body>
<form runat="server">
<h3> Calendar VisibleMonthChanged Example </h3>
Select a different month on the calendar.
<br><br>
<asp:Calendar id="Calendar1" runat="server">
<WeekendDayStyle BackColor="gray">
</WeekendDayStyle>
</asp:Calendar>
<hr>
<table border="1">
<tr bgcolor="Silver">
<th>
Month navigation direction
</th>
</tr>
<tr>
<td>
<asp:Label id="Message"
Text="Starting Month."
runat="server"/>
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">
void MonthChange(Object sender, MonthChangedEventArgs e)
{
if (e.NewDate.Month > e.PreviousDate.Month)
{
Message.Text = "You moved forward one month.";
}
else
{
Message.Text = "You moved backwards one month.";
}
}
void Page_Load(Object sender, EventArgs e)
{
// Manually register the event-handling method for the
// VisibleMonthChanged event of the Calendar control.
Calendar1.VisibleMonthChanged +=
new MonthChangedEventHandler(this.MonthChange);
}
</script>
</head>
<body>
<form runat="server">
<h3> Calendar VisibleMonthChanged Example </h3>
Select a different month on the calendar.
<br><br>
<asp:Calendar id="Calendar1" runat="server">
<WeekendDayStyle BackColor="gray">
</WeekendDayStyle>
</asp:Calendar>
<hr>
<table border="1">
<tr bgcolor="Silver">
<th>
Month navigation direction
</th>
</tr>
<tr>
<td>
<asp:Label id="Message"
Text="Starting month."
runat="server"/>
</td>
</tr>
</table>
</form>
</body>
</html>
平台
Windows 98、Windows 2000 SP4、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
System.Web.UI.WebControls 命名空间
Calendar 类
MonthChangedEventArgs 类
Calendar.VisibleMonthChanged 事件