添加项目文件。

Wpf.Ui.Extend/Converters/BooleanAllConverter.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Windows.Data;
+
+namespace Wpf.Ui.Extend.Converters;
+
+internal class BooleanAllConverter : IMultiValueConverter
+{
+    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        => values.OfType<bool>().All(b => b);
+
+    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        => throw new NotImplementedException();
+}