Changing background color of some rows in a combobox

Question

I have a bound combobox and depending on the values I get back in the records I want to change the background color of certain rows in the combobox. Is this possible and if so how?

A little more clarification. I'm looking at one of the fields in each row and based on its value I want to change the background color. So I could be changing all of the row, some of the rows, or none of the rows.

Thanks

Answer 1

Use the ItemContainerStyle to set the item background color per-row. You can bind to a property in the row's data context, and use an IValueConverter to get the appropriate brush. Eg, assuming that the items have a property "Y":

<ComboBox>
    <ComboBox.Resources>
        <local:BoolToBrushConverter x:Key="BoolToBrushConverter" />
    </ComboBox.Resources>
    <ComboBox.ItemContainerStyle>
        <Style TargetType="ComboBoxItem">
            <Setter Property="Background" 
                    Value="{Binding Y,Converter={StaticResource BoolToBrushConverter}}" />
        </Style>
    </ComboBox.ItemContainerStyle>
</ComboBox>

Then the "BoolToBrushConverter" would be something like this:

public class BoolToBrushConverter: IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (value as bool? == true) ? Brushes.Green : Brushes.Red;
    }

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