[Solved] ExpressionColumn Foreground IValueConverter

[Mark]

Hi and thanks as always,

Normally when I want to paint my text color baseis negative I send it through an IValueConverter:

public class ValueToForegroundColorConverter : IValueConverter
    {
        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            SolidColorBrush brush = new SolidColorBrush(Colors.Black);
            Double doubleValue = 0.0;
            Double.TryParse(value.ToString(), out doubleValue);
            if (doubleValue < 0)
                brush = new SolidColorBrush(Colors.Red);
            return brush;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }

Can the Grid's expression column use this approach?  If not a little help please. 

[Yavor Georgiev]

Hi Mark,

 Could you please share a bit more details about your scenario? Where do you usually apply this ValueConverter? Please demonstrate a usage with an ordinary GridViewDataColumn.

All the best,
Yavor Georgiev
the Telerik team

[Mark]

Hi Yavor,

I'm sorry I wasn't clear.  I meant that I apply this converter on "simple" text boxes / blocks that I want to paint red when negative.  I've not used same with a GridViewColumn.

I was trying to have the same outcome within a grid, i.e. change text color to red on a negative calculated column value.  (Mind you not the cell itself).

Thanks,
Mark

[Yavor Georgiev]

Hello Mark,

 With next week's Internal Build we will introduce a new feature - ConditionalStyleSelectors, which use Expressions such as in the ExpressionColumn. Check the telerik blogs by the end of next week for a blog post demonstrating the feature.

Best wishes,
Yavor Georgiev
the Telerik team

[Mark]

Fantastic - thanks so much!

[Mark]

Hi Yavor / all,

I was just following up on this thread.  I haven't been able to find any information on implementing ConditionalStyleSelectors within the blogs.  Is that something that was finally delivered?

Many thanks,
Mark

[Yavor Georgiev]

Hi Mark,

 The conditional StyleSelector did make it for our Q2 release, but its introductory blog post is still in the pipeline. However, you can check out our online example here. I hope that it will be sufficient to get you started.

 Please don't hesitate to let me know if you need any sort of assistance in implementing this feature.

Greetings, Yavor Georgiev
the Telerik team

[Mark]

Perfect, tyvm!