DatePicker.DateValidationError Événement

Définition

Se produit lorsque la propriété Text a une valeur qui ne peut pas être interprétée comme une date ou lorsque la date ne peut pas être sélectionnée.Occurs when Text is set to a value that cannot be interpreted as a date or when the date cannot be selected.

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

EventHandler<DatePickerDateValidationErrorEventArgs>

Exemples

L’exemple suivant crée un DatePicker qui affiche les dates en août 2009 et spécifie que chaque samedi et dimanche ne peut pas être sélectionné.The following example creates a DatePicker that displays the dates in August 2009 and specifies that each Saturday and Sunday is not selectable.

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>

Le DatePicker gère l' DateValidationError événement, comme indiqué dans le code suivant.The DatePicker handles the DateValidationError event, as shown in the following code. Si l’utilisateur entre une date qui ne peut pas être sélectionnée, l’exemple affiche un message.If the user enters a date that is not selectable, the example displays a message. Si l’utilisateur entre du texte qui n’est pas une date valide, une exception est levée.If the user enters text that is not a valid date, an exception is thrown.

// 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' DateValidationError événement se produit, si vous affectez à la propriété la valeur DatePickerDateValidationErrorEventArgs.ThrowException , l' true une des exceptions suivantes est levée :After the DateValidationError event occurs, if you set the DatePickerDateValidationErrorEventArgs.ThrowException property to true, one of the following exceptions is raised:

Type d'exceptionException type ConditionCondition
FormatException Le texte entré ne peut pas être analysé à une date valide et l’exception n’est pas supprimée.The text entered cannot be parsed to a valid date, and the exception is not suppressed.
ArgumentOutOfRangeException Le texte entré est analysé à une date qui ne peut pas être sélectionnée.The text entered parses to a date that is not selectable.

Utilisation d'attributs XAMLXAML Attribute Usage

<DatePicker DateValidationError="eventhandler"/>  

S’applique à