chore: add Object2BooleanReConverter.

src/Shared/HandyControl_Shared/Tools/Converter/Object2BooleanConverter.cs

@@ -6,7 +6,7 @@ namespace HandyControl.Tools.Converter;
 
 public class Object2BooleanConverter : IValueConverter
 {
-    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => !(value is null);
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => value is not null;
 
     public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
     {

src/Shared/HandyControl_Shared/Tools/Converter/Object2BooleanReConverter.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace HandyControl.Tools.Converter;
+
+public class Object2BooleanReConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => value is null;
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}