c# - NullToVisibilityConverter make visible if not null

Question

Want to hide and show property grid for SelectedItem in listview

<UserControl xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
      <ListView>
         <!--here is list view-->
      </ListView>
      <xctk:PropertyGrid SelectedObject="{Binding Active}" Visibility="{Binding Active, Converter=NullToVisibilityConverter}" >  
   </xctk:PropertyGrid>
</UserControl>

So I need converter and use it in visibility property converter. Any help?

Answer 1

public class NullVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value == null ? Visibility.Hidden : Visibility.Visible;
    }

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

Then reference the NullVisibilityConverter in your XAML Resources.

<StackPanel.Resources>
  <simpleXamlContent:NullVisibilityConverter x:Key="NullToVisibilityConverter"/>
</StackPanel.Resources>