CODEWITHSUNDEEP
wpfvb.netdatepicker
glant
glant

Reputation: 479

how to reset the datapicker date value to original value

I have a wpf application with datagrid and it has datapicker which has date value. If the user changes the date then some logic is run and a popup displayed as part of selectionChangedEvent hanlder code. If they choose 'No' on the popup then I Want to reset the date...Unable to figure this part

MyXaml

                        <DataGridTemplateColumn Header="Start Date">
                            <DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <DatePicker Name="StartDate" SelectedDate="{Binding StartDate}" BorderThickness="0" SelectedDateChanged="StartDate_SelectedDateChanged">
                                        <DatePicker.Resources>
                                            <Style TargetType="DatePickerTextBox">
                                                <Setter Property="IsReadOnly" Value="True"/>
                                                <Setter Property="IsEnabled" Value="False"/>
                                            </Style>
                                        </DatePicker.Resources>                                            
                                    </DatePicker>
                                </DataTemplate>
                            </DataGridTemplateColumn.CellTemplate>
                        </DataGridTemplateColumn>

Code

     Private Sub ValidateDateChanged(sender As Object, e As SelectionChangedEventArgs)
        If MessageBoxResult.No = MessageBox.Show("Yes to Continue with the change",
                                                    vbApplicationModal + MsgBoxStyle.Information, MessageBoxButton.YesNo) Then
             how to reset the date value to the original value and stop event handler to not invoke again for this ovriden date change
             was trying this e.source.SelectedDate = CType(e.RemovedItems(0), Date)
        End If
     Sub

UPDATE: Problem is two additional events for the same datepicker are fired causing the popup to be displayed three times. This happens at the time of the load also

Upvotes: 0

Views: 168

Answers (1)

mm8
mm8

Reputation: 169200

You could use a Boolean variable to temporarily suspend the event handler from actually doing something, e.g.:

Private _handleEvent As Boolean = True
Private Sub ValidateDateChanged(sender As Object, e As SelectionChangedEventArgs)
    If _handleEvent And MessageBoxResult.No = MessageBox.Show("Yes to Continue with the change",
                                                   vbApplicationModal + MsgBoxStyle.Information, MessageBoxButton.YesNo) Then
        Dim dp As DatePicker = CType(sender, DatePicker)
        _handleEvent = False
        dp.SelectedDate = CType(e.RemovedItems(0), Date?)
        _handleEvent = True
    End If
End Sub

Upvotes: 1

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