Binding Converter how to pass a parameter to function

Question

In my window.xaml I have the following code:

 xmlns:converters="clr-namespace:HMIPlc.Helpers"

 <Window.Resources>
    <ResourceDictionary>
        <converters:ColorConverter x:Key="ColorOnChange"/>
    </ResourceDictionary>
</Window.Resources>

<Rectangle Fill="{Binding Path=varUnit.InSimulation, Converter={StaticResource ColorOnChange}}"/> 

I want to give also a value in a string "Yellow" or "Orange" to the function, so I can use the same function for different rectangles with different colors.

My ColorConverter.cs class inside the Helpers directory:

public class ColorConverter : IValueConverter
{
    public ColorConverter()
    {
    }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool tempBool = (bool)value;
        if(tempBool == true)
        {
            return new SolidColorBrush(Colors.Orange);
        } else
        {
            return new SolidColorBrush(Colors.White);
        }
    }

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

So that I can determine in my XAML if the color has to be orange or yellow. Is there any good method to do this?

Answer 1

You could set the CommandParameter property to a Brush or Color and cast the "parameter" argument in your converter:

public class ColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        Color color = (Color)parameter;
        bool tempBool = (bool)value;
        if (tempBool == true)
        {
            return new SolidColorBrush(color);
        }
        else
        {
            return new SolidColorBrush(color);
        }
    }

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

XAML:

<Rectangle Fill="{Binding Path=varUnit.InSimulation, Converter={StaticResource ColorOnChange},
        ConverterParameter={x:Static Colors.Orange}}"/>