MonthChangedEventHandler 委托
定义
重要
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表示处理 VisibleMonthChanged 控件的 Calendar 事件的方法。
public delegate void MonthChangedEventHandler(System::Object ^ sender, MonthChangedEventArgs ^ e);public delegate void MonthChangedEventHandler(object sender, MonthChangedEventArgs e);type MonthChangedEventHandler = delegate of obj * MonthChangedEventArgs -> unitPublic Delegate Sub MonthChangedEventHandler(sender As Object, e As MonthChangedEventArgs)参数
- sender
- Object
事件源。
包含事件数据的 MonthChangedEventArgs。
示例
下面的代码示例演示如何指定 VisibleMonthChanged 和编码控件中显示的 事件的处理程序，该处理程序显示在控件中 Label ，控件是向前移动还是 Calendar 向后移动一个月。
<%@ 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> Calendar VisibleMonthChanged Example </title>
<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 id="form1" 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 style="background-color: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" %>
<!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> Calendar VisibleMonthChanged Example </title>
<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 id="form1" 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 style="background-color: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" %>
<!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> Calendar VisibleMonthChanged Example </title>
<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 id="form1" 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 style="background-color: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" %>
<!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> Calendar VisibleMonthChanged Example </title>
<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 id="form1" 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 style="background-color:Silver">
<th>
Month navigation direction
</th>
</tr>
<tr>
<td>
<asp:Label id="Message"
Text="Starting Month."
runat="server"/>
</td>
</tr>
</table>
</form>
</body>
</html>
注解
VisibleMonthChanged当用户单击控件的导航控件Calendar以显示下一个月或上一个月时，将引发 该事件。
创建 MonthChangedEventHandler 委托时，需要标识将处理该事件的方法。 若要将事件与事件处理程序关联，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会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 处理和引发事件。
扩展方法
| GetMethodInfo(Delegate) |
获取指示指定委托表示的方法的对象。 |
