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 was able to solve this for a recent project using a bool to visibility converter:

public class BoolToVisibilityConverter : IValueConverter
{

    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value.GetType().Equals(typeof(bool)))
        {
            if ((bool)value == true)
                return Visibility.Visible;
            else
                return Visibility.Collapsed;
        }
        else
            return Visibility.Visible;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value.GetType().Equals(typeof(Visibility)))
        {
            if ((Visibility)value == Visibility.Collapsed)
                return false;
            else
                return true;
        }
        else
            return false;

    }

    #endregion
}    

I think I could have probably replaced this line:

if (value.GetType().Equals(typeof(Visibility)))

with something more simple like this:

if (value is Visibility)

same with the bool GetType, but you get the idea.

Of course, in your converter you can reverse the visility values based on your visibility needs. Hope this helps a little.