DatePicker.SelectedDateChanged Evento

Definição

Namespace:

Windows.UI.Xaml.Controls

Ocorre quando o valor de data é alterado.

// Register
event_token SelectedDateChanged(TypedEventHandler<DatePicker, DatePickerSelectedValueChangedEventArgs const&> const& handler) const;

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

// Revoke with event_revoker
DatePicker::SelectedDateChanged_revoker SelectedDateChanged(auto_revoke_t, TypedEventHandler<DatePicker, DatePickerSelectedValueChangedEventArgs const&> const& handler) const;

public event TypedEventHandler<DatePicker,DatePickerSelectedValueChangedEventArgs> SelectedDateChanged;

function onSelectedDateChanged(eventArgs) { /* Your code */ }
datePicker.addEventListener("selecteddatechanged", onSelectedDateChanged);
datePicker.removeEventListener("selecteddatechanged", onSelectedDateChanged);
- or -
datePicker.onselecteddatechanged = onSelectedDateChanged;

Public Custom Event SelectedDateChanged As TypedEventHandler(Of DatePicker, DatePickerSelectedValueChangedEventArgs) 

<DatePicker SelectedDateChanged="eventhandler" />

Tipo de evento

TypedEventHandler<DatePicker,DatePickerSelectedValueChangedEventArgs>

Requisitos do Windows

Família de dispositivos	Windows 10, version 1809 (introduzida na 10.0.17763.0)
API contract	Windows.Foundation.UniversalApiContract (introduzida na v7.0)

Exemplos

Aqui está um exemplo de um SelectedDateChanged manipulador de eventos. Para ver este exemplo com mais contexto, consulte Controles de calendário, data e hora – Use um seletor de data e um seletor de hora juntos.

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

DateTime arrivalDateTime;

private void ArrivalDatePicker_SelectedDateChanged(DatePicker sender, DatePickerSelectedValueChangedEventArgs args)
{
    if (arrivalDatePicker.SelectedDate != null)
    {
        if (VerifyDateIsFuture((DateTimeOffset)arrivalDatePicker.SelectedDate) == true)
        {
            arrivalDateTime = new DateTime(args.NewDate.Value.Year, args.NewDate.Value.Month, args.NewDate.Value.Day);

            arrivalText.Text = arrivalDateTime.ToString();
        }
        else
        {
            arrivalDatePicker.SelectedDate = null;
            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 DatePickerSelectedValueChangedEventArgs 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

• SelectedDate
• DatePickerSelectedValueChangedEventArgs
• Seletor de data