Question

I am trying to use two DatePicker controls to specify a start and end date within a specified range, whilst also limiting the selections so that the start date is before the end date and the end date is after the start date.

So I have tried this XAML:

<GroupBox Grid.Row="1" Header="Run Length">
            <StackPanel Orientation="Horizontal">
                <DockPanel VerticalAlignment="Top">
                    <Label DockPanel.Dock="Left">Start Date</Label>
                    <DatePicker DockPanel.Dock="Right" Height="25" SelectedDate="{Binding Path=RunStartDate, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" DisplayDateStart="{Binding Path=MinDate, Mode=OneWay, NotifyOnSourceUpdated=True}" DisplayDateEnd="{Binding Path=RunEndDate, Mode=OneWay, NotifyOnSourceUpdated=True}"></DatePicker>
                </DockPanel>
                <DockPanel VerticalAlignment="Top">
                    <Label DockPanel.Dock="Left">End Date</Label>
                    <DatePicker DockPanel.Dock="Right" Height="25" SelectedDate="{Binding Path=RunEndDate, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" DisplayDateStart="{Binding Path=RunStartDate, Mode=OneWay, NotifyOnSourceUpdated=True}" DisplayDateEnd="{Binding Path=MaxDate, Mode=OneWay, NotifyOnSourceUpdated=True}"></DatePicker>
                </DockPanel>
            </StackPanel>
        </GroupBox>

However when the values of ‘MinDate’ and ‘MaxDate’ change, the DatePickers do not? Can anyone explain why?

Thanks,
Alex.

Answer 1

Make sure MinDate and MaxDate are public properties which implement INotifyPropertyChanged.

Here is a MSDN example to help you out.