MonthChangedEventHandler Delegar
Definição
Representa o método que manipula o evento VisibleMonthChanged de um controle Calendar.Represents the method that handles the VisibleMonthChanged event of a Calendar control.
public delegate void MonthChangedEventHandler(System::Object ^ sender, MonthChangedEventArgs ^ e);
public delegate void MonthChangedEventHandler(object sender, MonthChangedEventArgs e);
type MonthChangedEventHandler = delegate of obj * MonthChangedEventArgs -> unit
Public Delegate Sub MonthChangedEventHandler(sender As Object, e As MonthChangedEventArgs)
Parâmetros
- sender
- Object
A fonte do evento.The source of the event.
Um MonthChangedEventArgs que contém os dados do evento.A MonthChangedEventArgs that contains the event data.
Exemplos
O exemplo de código a seguir demonstra como especificar e codificar um manipulador para o VisibleMonthChanged evento que é exibido em um Label controle se o Calendar controle foi movido para frente ou para trás um mês.The following code example demonstrates how to specify and code a handler for the VisibleMonthChanged event that displays in a Label control whether the Calendar control has moved forward or backward one month.
<%@ 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>
Comentários
O VisibleMonthChanged evento é gerado quando o usuário clica nos controles de navegação para que o Calendar controle exiba o mês seguinte ou anterior.The VisibleMonthChanged event is raised when the user clicks the navigation controls for the Calendar control to display the next or previous month.
Ao criar um MonthChangedEventHandler delegado, você identifica o método que manipulará o evento.When you create a MonthChangedEventHandler delegate, you identify the method that will handle the event. Para associar o evento ao manipulador de eventos, adicione uma instância do delegado ao evento.To associate the event with your event handler, add an instance of the delegate to the event. O manipulador de eventos é chamado sempre que o evento ocorre, a menos que você remova o representante.The event handler is called whenever the event occurs, unless you remove the delegate. Para obter mais informações sobre delegados de manipulador de eventos, consulte manipulando e gerando eventos.For more information about event handler delegates, see Handling and Raising Events.
Métodos de Extensão
| GetMethodInfo(Delegate) |
Obtém um objeto que representa o método representado pelo delegado especificado.Gets an object that represents the method represented by the specified delegate. |