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

using System;
using System.Globalization;
using System.Windows.Data;

namespace AIStudio.Wpf.DiagramDesigner
{
    public class AdditionConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if ((value != null) && (parameter != null))
            {
                var firstValue = (double)value;
                var secondValue = double.Parse(parameter?.ToString());

                return firstValue + secondValue;
            }

            return 0d;
        }

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