添加项目文件。

UIShare/Converters/InverseBooleanConverter.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace UIShare.Converters
+{
+    public class InverseBooleanConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            // null 视为 false，再取反 → true
+            var b = value as bool?;
+            return !(b ?? false);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var b = value as bool?;
+            return !(b ?? false);
+        }
+    }
+}