DatePicker.DateChanged Evento

Definição

Namespace:

Windows.UI.Xaml.Controls

Ocorre quando o valor da data é alterado.

// Register
event_token DateChanged(EventHandler<DatePickerValueChangedEventArgs> const& handler) const;

// Revoke with event_token
void DateChanged(event_token const* cookie) const;

// Revoke with event_revoker
DatePicker::DateChanged_revoker DateChanged(auto_revoke_t, EventHandler<DatePickerValueChangedEventArgs> const& handler) const;

public event System.EventHandler<DatePickerValueChangedEventArgs> DateChanged;

function onDateChanged(eventArgs) { /* Your code */ }
datePicker.addEventListener("datechanged", onDateChanged);
datePicker.removeEventListener("datechanged", onDateChanged);
- or -
datePicker.ondatechanged = onDateChanged;

Public Custom Event DateChanged As EventHandler(Of DatePickerValueChangedEventArgs) 

<DatePicker DateChanged="eventhandler" />

Tipo de evento

EventHandler<DatePickerValueChangedEventArgs>

EventHandler<DatePickerValueChangedEventArgs>

Exemplos

Aqui está um exemplo de um DateChanged manipulador de eventos.

<StackPanel>
    <DatePicker x:Name="arrivalDatePicker" Header="Arrival date"
                DateChanged="ArrivalDatePicker_DateChanged"/>
    <TextBlock x:Name="arrivalText"/>
</StackPanel>

DateTime arrivalDateTime;

private void ArrivalDatePicker_DateChanged(object sender, DatePickerValueChangedEventArgs e)
{
    if (VerifyDateIsFuture(arrivalDatePicker.Date) == true)
    {
        arrivalDateTime = new DateTime(e.NewDate.Year, e.NewDate.Month, e.NewDate.Day);
        arrivalText.Text = string.Format("Thank you. Your arrival is set for {0}.",
                                         arrivalDateTime.Date.ToString("D"));
    }
    else
    {
        arrivalText.Text = "Arrival date must be later than today.";
    }
}

private bool VerifyDateIsFuture(DateTimeOffset date)
{
    if (date > DateTimeOffset.Now)
    {
        return true;
    }
    return false;
}

Comentários

Ao manipular esse evento, use as propriedades OldDate e NewDate dos dados de evento DatePickerValueChangedEventArgs para sua lógica. Essas propriedades usam tipos de dados diferentes dependendo da linguagem de programação (C# e Visual Basic usam System.DateTimeOffset; As extensões de componente do Visual C++ (C++/CX) usam Windows::Foundation::D ateTime).

Confira também

• Date
• SelectedDate
• DatePickerValueChangedEventArgs
• Seletor de data