aistudio-wpf-diagram/AIStudio.Wpf.DiagramDesigner/Converters/NullableToVisibilityConverter.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Windows.Data;
using System.Windows;

namespace AIStudio.Wpf.DiagramDesigner
{
    public class NullableToVisibilityConverter : IValueConverter
    {
        public Visibility NullValue { get; set; } = Visibility.Collapsed;
        public Visibility NotNullValue { get; set; } = Visibility.Visible;

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value == null ? NullValue : NotNullValue;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return Binding.DoNothing;
        }
    }
}