I got this error string was not recognized as a valid datetime when I validate WPF DatePicker control

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I have a WPF application, with a WPF Toolkit DatePicker control bound to a DateTime variable as following:

C#

<myToolkit:DatePicker Grid.Row="4" Grid.Column="4" x:Name="clndrHiredate" HorizontalAlignment="Left" Height="20" Width="150" VerticalAlignment="Top" FontFamily="Tahoma" FontWeight="Light" FlowDirection="RightToLeft" SelectedDate="{Binding bindingDate,StringFormat='{}{0:MM/dd/yyyy}', Mode=TwoWay}" />

<Button Grid.Row="8" Grid.Column="4" Style="{StaticResource GlassButton}" x:Name="btnRead" Height="29" Content="Read" FontSize="14" Foreground="White" HorizontalContentAlignment="Center" FontFamily="Arial" FontWeight="Bold" Background="#FF47594E" Margin="64,13,31,196" Width="65" />

And my code :

C#

private DateTime bindingDate = DateTime.Now;

private void btnRead_Click(object sender, RoutedEventArgs e)
{
      if (string.IsNullOrEmpty(clndrHiredate.SelectedDate.ToString()))
      {
          errorText += MessageBox.show("Wrong");
          state = true;
          lblHireDate.Visibility = Visibility.Visible;
      }
      else
      {
          // complete 
      }
}

but when I run this , I got error message "string was not recognized as a valid datetime."

If there is any error, How do I fix this?

Thanks.

[edit]fixed code tags[/edit]

Posted 10-Nov-12 10:12am

Doudy_2020

Updated 10-Nov-12 10:28am

Nelek

v2

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Issam Ali · Answer 1 · 2012-11-10T12:30:00

You can not bind to private field; you need public property (notifying property or a dependency property) to bind to it. Here is my suggestion and I hope it may help you

Declare new dependency property in the Window class like this:

C#

public DateTime BindingDate
{
    get { return (DateTime)GetValue(DateBindingProperty); }
    set { SetValue(DateBindingProperty, value); }
}

public static readonly DependencyProperty DateBindingProperty =
    DependencyProperty.Register("DateBinding", typeof(DateTime), typeof(MainWindow), new FrameworkPropertyMetadata(DateTime.Now));

Then replace your XAML code to bind the SelectedDate to this dependency property (BindingDate) like this:

<DatePicker Height="29" HorizontalAlignment="Left"
            Margin="78,65,0,0" Name="datePicker1" VerticalAlignment="Top" Width="163">
    <DatePicker.SelectedDate>
        <Binding Path="BindingDate" Mode="TwoWay">
            <Binding.RelativeSource>
                    <RelativeSource
                        Mode="FindAncestor"
                        AncestorType="{x:Type Window}"
                        AncestorLevel="1"/>
                </Binding.RelativeSource>
        </Binding>
    </DatePicker.SelectedDate>
</DatePicker>

Doudy_2020 · Answer 2 · 2012-11-11T02:18:00

I solved this like that:

C#

<mytoolkit:datepicker grid.row="4" grid.column="4" x:name="clndrHiredate" horizontalalignment="Left" height="20" xmlns:x="#unknown" xmlns:mytoolkit="#unknown">
                  Width="150" VerticalAlignment="Top" FontFamily="Tahoma" FontWeight="Light" FlowDirection="RightToLeft"/>

private void Window_Loaded(object sender, RoutedEventArgs e)
   {
   this.clndrHiredate.SelectedDate = Convert.ToDateTime(DateTime.Now.ToString("MM/dd/yyyy"));
   }

private void btnRead_Click(object sender, RoutedEventArgs e)
{
  if (clndrHiredate.SelectedDate == null)
     errorText += MessageBox.show("Wrong");
          state = true;
          lblHireDate.Visibility = Visibility.Visible;
      }
      else
      {
          // complete 
      }

}</mytoolkit:datepicker>

[edit]code block added[/edit]

I got this error string was not recognized as a valid datetime when I validate WPF DatePicker control

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