FlexGrid ValueConverter and Checkbox Column

FlexGrid ValueConverter and Checkbox Column

Posted by: jim.garrison on 7 July 2025, 2:05 pm EST

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  jim.garrison

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  Posted 7 July 2025, 2:05 pm EST - Updated 7 July 2025, 2:13 pm EST

  I assign a ValueConverter that returns a Boolean value to a FlexGrid GridColumn but it does not display a checkbox. It only presents True, False or blank as an editable textbox.

  Is there another way to Bind a Boolean value to a FlexGrid column so it displays a checkbox?

  /// <summary>
  /// Converts string = "-1" to true and not "-1" to false
  /// Converts back from true to "-1" and false to null
  /// </summary>
  public class StringToBoolConverter : IValueConverter
  {
      public object Convert(object value, Type targetType, object parameter, string language)
      {
          return (string)value == "-1";
      }
  
      public object ConvertBack(object value, Type targetType, object parameter, string language)
      {
          return (bool)value ? "-1" : null;
      }
  }

                            <c1:FlexGrid.Columns>
                                <c1:GridColumn Binding="Remove"
                                       ValueConverter="{StaticResource StringToBoolConverter}"
                                       IsReadOnly="False"
                                       Header="Include?"
                                       Width="100"/>

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  kartik.dua

  

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  Posted 8 July 2025, 10:03 am EST

  Hi Jim,

  The FlexGrid displays a checkbox editor only when the corresponding GridColumn is bound to a Boolean field in the ItemsSource. If the field’s data type is a string (as in your case), the grid defaults to using a TextBox as the editor.

  To display a checkbox for a string-based field, you’ll need to use a custom CellTemplate for that column. This template should have a CheckBox control, and you can bind its IsChecked property to your string field using an IValueConverter to handle the conversion.

  Please see the attached sample project for reference - CustomCheckBoxBinding.zip

  Best Regards,
  
  Kartik