chore: use file-scoped namespace

src/Shared/HandyControlDemo_Shared/UserControl/Basic/GeometryItem.xaml.cs

@@ -1,19 +1,18 @@
 using System.Windows;
 using HandyControlDemo.Data;
 
-namespace HandyControlDemo.UserControl
+namespace HandyControlDemo.UserControl;
+
+public partial class GeometryItem
 {
-    public partial class GeometryItem
+    public GeometryItem() => InitializeComponent();
+
+    public static readonly DependencyProperty InfoProperty = DependencyProperty.Register(
+        "Info", typeof(GeometryItemModel), typeof(GeometryItem), new PropertyMetadata(default(GeometryItemModel)));
+
+    public GeometryItemModel Info
     {
-        public GeometryItem() => InitializeComponent();
-
-        public static readonly DependencyProperty InfoProperty = DependencyProperty.Register(
-            "Info", typeof(GeometryItemModel), typeof(GeometryItem), new PropertyMetadata(default(GeometryItemModel)));
-
-        public GeometryItemModel Info
-        {
-            get => (GeometryItemModel) GetValue(InfoProperty);
-            set => SetValue(InfoProperty, value);
-        }
+        get => (GeometryItemModel) GetValue(InfoProperty);
+        set => SetValue(InfoProperty, value);
     }
-}
+}