Question

I have setup binding as follows

XAML

 <TextBlock Text="{Binding Path=Color, Converter={StaticResource ColorToStringConverter}}" />

C#: Showing what Color is

public System.Windows.Media.Color Color
{
    get
    {
        var color = new HSLColor { Hue = this.Hue, Saturation = this.Saturation, Luminosity = this.Luminosity };
        string strColor = color.ToRGBString();
        return new System.Windows.Media.Color { 
            R = byte.Parse(strColor.Substring(0, 2), System.Globalization.NumberStyles.HexNumber),
            G = byte.Parse(strColor.Substring(2, 2), System.Globalization.NumberStyles.HexNumber),
            B = byte.Parse(strColor.Substring(4, 2), System.Globalization.NumberStyles.HexNumber)
        };
    }
    set { SetValue(ColorProperty, value); }
}

Converter

public class ColorToStringConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        Color color = (Color)value;
        return color.ToString();
    }
}

But my converter is getting value like

value = "{Name=0, ARGB=(0, 0, 0, 0)}"

I’d expect it to be a System.Windows.Media.Color why am I getting this?

Basically, I have 3 Silders for HSL values bound to DependencyProperties, each have a PropertyChangedCallback attached to them

new PropertyChangedCallback(HSLValuePropertyChanged)

It looks like

protected void HSLValueChanged()
{
    if (PropertyChanged != null)
        PropertyChanged(this, new PropertyChangedEventArgs("Color"));
}

Basically its purpose is to update controls bound to the dependency property Color. The idea is that get should run for property Color which creates a new color from HSL properties. The problem it seems is that the get does not run even when I change HSL values.

UPDATE

So I tried to return just value in the case of an exception, I got nothing in the textbox, so i did value.toString() got Color [Empty] all the time. What did I do wrong?

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    try
    {
        Color color = (Color)value;
        return color.ToString();
    } catch (Exception) {
        return value.ToString();
    }
}

Answer 1

You seem to be using the ColorDependencyProperty.
If so, I think the binding may never actually go trough the accessors (get/set) …

You should set the new color (in the dependencyProperty via the setvalue method) on each of your H/S/L properties change call back…

I hope i am clear 🙂