添加项目文件。

Util.DiagramDesigner/Converters/TrueToFalseConverter.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Util.DiagramDesigner
+{
+    /// <summary>
+    /// 这是一个颠倒黑白的世界
+    /// </summary>
+    public sealed class TrueToFalseConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var v = (bool)value;
+            return !v;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}