DatePicker.DateValidationError イベント

定義

Text が日付として解釈できない値に設定されている場合、または日付を選択できない場合に発生します。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 Event DateValidationError As EventHandler(Of DatePickerDateValidationErrorEventArgs) 

次の例ではDatePicker 、2009年8月に日付を表示するを作成し、各土曜日と日曜日を選択できないように指定しています。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>

DatePicker 、次DateValidationErrorのコードに示すように、イベントを処理します。The DatePicker handles the DateValidationError event, as shown in the following code. ユーザーが選択できない日付を入力した場合、この例ではメッセージが表示されます。If the user enters a date that is not selectable, the example displays a message. ユーザーが有効な日付でないテキストを入力すると、例外がスローされます。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

注釈

イベントが発生した後、 DatePickerDateValidationErrorEventArgs.ThrowExceptionプロパティをにtrue設定すると、次のいずれかの例外が発生します。 DateValidationErrorAfter the DateValidationError event occurs, if you set the DatePickerDateValidationErrorEventArgs.ThrowException property to true, one of the following exceptions is raised:

例外の種類Exception type 条件Condition
FormatException 入力したテキストを有効な日付に解析できません。また、例外は抑制されません。The text entered cannot be parsed to a valid date, and the exception is not suppressed.
ArgumentOutOfRangeException 入力したテキストは、選択できない日付に解析されます。The text entered parses to a date that is not selectable.

XAML 属性の使用方法XAML Attribute Usage

<DatePicker DateValidationError="eventhandler"/>  

適用対象