更新

AntdWpf/Converters/DoubleToThicknessMultiConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+using System.Windows.Markup;
+using System.Windows;
+
+namespace AntdWpf.Converters
+{
+    public class DoubleToThicknessMultiConverter : MarkupExtension, IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            var parent = values[0] as double?;
+            var self = values[1] as double?;
+
+            if (parent == null || self == null)
+            {
+                return default(Thickness);
+            }
+
+            double.TryParse(parameter as string, out double param);
+            return new Thickness(parent.Value - self.Value - param, 0.0, 0.0, 0.0);
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            return targetTypes.Select(t => DependencyProperty.UnsetValue).ToArray();
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return this;
+        }
+    }
+}