Silverlight Bind to inverse of boolean property value

Question

I want to bind a controls visibility to inverse of boolean property value. I have a property CanDownload, if it is true then I want to hide textbox and vice versa. How can I ach

Answer 1

I use a BoolToVisibilityConverter that allows you to pass "Inverse" as the ConverterParameter to inverse the conversion and show only if the property is false.

public class BoolToVisibilityConverter : IValueConverter
{
    /// TargetType must be Visibility
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if(!(value is bool))
            throw new ArgumentException("Source must be of type bool");

        if(targetType != typeof(Visibility))
            throw new ArgumentException("TargetType must be Visibility");

        bool v = (bool) value;

        if(parameter is string && parameter.ToString() == "Inverse")
            v = !v;

        if (v)
            return Visibility.Visible;
        else
            return Visibility.Collapsed;
    }

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