DatePicker.DateValidationError Événement

public:
 event EventHandler<System::Windows::Controls::DatePickerDateValidationErrorEventArgs ^> ^ DateValidationError;

public event EventHandler<System.Windows.Controls.DatePickerDateValidationErrorEventArgs> DateValidationError;

member this.DateValidationError : EventHandler<System.Windows.Controls.DatePickerDateValidationErrorEventArgs> 

Public Custom Event DateValidationError As EventHandler(Of DatePickerDateValidationErrorEventArgs) 

Public Event DateValidationError As EventHandler(Of DatePickerDateValidationErrorEventArgs) 

Type d'événement

Exemples

L’exemple suivant crée un DatePicker qui affiche les dates d’août 2009 et spécifie que chaque samedi et dimanche n’est pas sélectionnable.

DatePicker datePickerWithBlackoutDates = new DatePicker();

datePickerWithBlackoutDates.DisplayDateStart = new DateTime(2009, 8, 1);
datePickerWithBlackoutDates.DisplayDateEnd = new DateTime(2009, 8, 31);
datePickerWithBlackoutDates.SelectedDate = new DateTime(2009, 8, 10);

datePickerWithBlackoutDates.BlackoutDates.Add(
    new CalendarDateRange(new DateTime(2009, 8, 1), new DateTime(2009, 8, 2)));
datePickerWithBlackoutDates.BlackoutDates.Add(
    new CalendarDateRange(new DateTime(2009, 8, 8), new DateTime(2009, 8, 9)));
datePickerWithBlackoutDates.BlackoutDates.Add(
    new CalendarDateRange(new DateTime(2009, 8, 15), new DateTime(2009, 8, 16)));
datePickerWithBlackoutDates.BlackoutDates.Add(
    new CalendarDateRange(new DateTime(2009, 8, 22), new DateTime(2009, 8, 23)));
datePickerWithBlackoutDates.BlackoutDates.Add(
    new CalendarDateRange(new DateTime(2009, 8, 29), new DateTime(2009, 8, 30)));

datePickerWithBlackoutDates.DateValidationError +=
    new EventHandler<DatePickerDateValidationErrorEventArgs>(DatePicker_DateValidationError);

// root is a Panel that is defined elsewhere.
root.Children.Add(datePickerWithBlackoutDates);

Dim datePickerWithBlackoutDates As New DatePicker()

datePickerWithBlackoutDates.DisplayDateStart = New DateTime(2009, 8, 1)
datePickerWithBlackoutDates.DisplayDateEnd = New DateTime(2009, 8, 31)
datePickerWithBlackoutDates.SelectedDate = New DateTime(2009, 8, 10)

datePickerWithBlackoutDates.BlackoutDates.Add( _
    New CalendarDateRange(New DateTime(2009, 8, 1), New DateTime(2009, 8, 2)))

datePickerWithBlackoutDates.BlackoutDates.Add( _
    New CalendarDateRange(New DateTime(2009, 8, 8), New DateTime(2009, 8, 9)))

datePickerWithBlackoutDates.BlackoutDates.Add( _
    New CalendarDateRange(New DateTime(2009, 8, 15), New DateTime(2009, 8, 16)))

datePickerWithBlackoutDates.BlackoutDates.Add( _
    New CalendarDateRange(New DateTime(2009, 8, 22), New DateTime(2009, 8, 23)))

datePickerWithBlackoutDates.BlackoutDates.Add( _
    New CalendarDateRange(New DateTime(2009, 8, 29), New DateTime(2009, 8, 30)))

AddHandler datePickerWithBlackoutDates.DateValidationError, _
    AddressOf DatePicker_DateValidationError

' root is a Panel that is defined elsewhere. 
root.Children.Add(datePickerWithBlackoutDates)

<DatePicker Name="datePickerWithBlackoutDates"
            DisplayDateStart="8/1/09"
            DisplayDateEnd="8/31/09"
            SelectedDate="8/10/09"
            DateValidationError="DatePicker_DateValidationError">
  <DatePicker.BlackoutDates>
    <CalendarDateRange Start="8/1/09" End="8/2/09"/>
    <CalendarDateRange Start="8/8/09" End="8/9/09"/>
    <CalendarDateRange Start="8/15/09" End="8/16/09"/>
    <CalendarDateRange Start="8/22/09" End="8/23/09"/>
    <CalendarDateRange Start="8/29/09" End="8/30/09"/>
  </DatePicker.BlackoutDates>
</DatePicker>

Gère DatePicker l’événement DateValidationError , comme indiqué dans le code suivant. Si l’utilisateur entre une date qui n’est pas sélectionnable, l’exemple montre comment afficher un message. Si l’utilisateur entre du texte qui n’est pas une date valide, une exception est levée.

// If the text is a valid date, but a part of the 
// BlackoutDates collection, show a message.
// If the text is not a valid date, thow an exception.
private void DatePicker_DateValidationError(object sender,
                DatePickerDateValidationErrorEventArgs e)
{
    DateTime newDate;
    DatePicker datePickerObj = sender as DatePicker;

    if (DateTime.TryParse(e.Text, out newDate))
    {
        if (datePickerObj.BlackoutDates.Contains(newDate))
        {
            MessageBox.Show(String.Format("The date, {0}, cannot be selected.",
                                           e.Text));
        }
    }
    else
    {
        e.ThrowException = true;
    }
}

' If the text is a valid date, but a part of the 
' BlackoutDates collection, show a message. 
' If the text is not a valid date, thow an exception. 
Private Sub DatePicker_DateValidationError(ByVal sender As Object, _
                                           ByVal e As DatePickerDateValidationErrorEventArgs)

    Dim newDate As DateTime
    Dim datePickerObj As DatePicker = TryCast(sender, DatePicker)

    If DateTime.TryParse(e.Text, newDate) Then
        If datePickerObj.BlackoutDates.Contains(newDate) Then
            MessageBox.Show([String].Format("The date, {0}, cannot be selected.", e.Text))
        End If
    Else
        e.ThrowException = True
    End If
End Sub

Remarques

Une fois que l’événement DateValidationError s’est produit, si vous définissez la DatePickerDateValidationErrorEventArgs.ThrowException propriété sur true, l’une des exceptions suivantes est levée :

Utilisation d'attributs XAML

<DatePicker DateValidationError="eventhandler"/>  

S’applique à