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AIStudio.Wpf.DiagramDesigner/Converters/AditionConverter.cs

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+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();
+        }
+    }
+}

AIStudio.Wpf.DiagramDesigner/Converters/GridLengthConverter.cs

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+using System;
+using System.Globalization;
+using System.Text.RegularExpressions;
+using System.Windows;
+using System.Windows.Data;
+
+namespace AIStudio.Wpf.DiagramDesigner
+{
+    public class GridLengthConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var length = value?.ToString();
+            try
+            {
+                double add = 0;
+                double.TryParse(parameter?.ToString(), out add);
+                return new GridLength(double.Parse(length) + add, GridUnitType.Pixel);
+            }
+            catch
+            {
+                return new GridLength(1, GridUnitType.Auto);
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return DependencyProperty.UnsetValue;
+        }
+    }
+
+    public class GridLengthAutoConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var length = value?.ToString();
+            try
+            {
+                if (Regex.IsMatch(length, @"^\d+(\.\d+)?$"))
+                {
+                    return new GridLength(double.Parse(length), GridUnitType.Pixel);
+                }
+                else if (length == "*")
+                {
+                    return new GridLength(1, GridUnitType.Star);
+                }
+                else if (Regex.IsMatch(length, @"^\d+(\.\d+)?\*$"))
+                {
+                    return new GridLength(double.Parse(length.Substring(0, length.Length - 1)), GridUnitType.Star);
+                }
+                else
+                {
+                    return new GridLength(1, GridUnitType.Auto);
+                }
+            }
+            catch
+            {
+                return new GridLength(1, GridUnitType.Auto);
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return DependencyProperty.UnsetValue;
+        }
+    }
+}