code formatting

src/Shared/HandyControl_Shared/Controls/Attach/DataGridAttach.cs

@@ -258,7 +258,7 @@ namespace HandyControl.Controls
 
         private static void OnShowRowNumberChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
         {
-            if (!(target is DataGrid dataGrid)) return;
+            if (target is not DataGrid dataGrid) return;
             var show = (bool) e.NewValue;
 
             if (show)
@@ -277,7 +277,7 @@ namespace HandyControl.Controls
 
         private static void ItemContainerGenerator_ItemsChanged(object sender, ItemsChangedEventArgs e)
         {
-            if (!(sender is ItemContainerGenerator generator)) return;
+            if (sender is not ItemContainerGenerator generator) return;
             UpdateItems(generator, e.ItemCount);
         }
 

src/Shared/HandyControl_Shared/Controls/Attach/MenuTopLineAttach.cs

@@ -16,13 +16,10 @@ namespace HandyControl.Controls
         {
             var topLine = (FrameworkElement) d;
 
-            if (e.NewValue is Popup popup)
+            if (e.NewValue is Popup {TemplatedParent: MenuItem menuItem})
             {
-                if (popup.TemplatedParent is MenuItem menuItem)
-                {
-                    SetTopLine(menuItem, topLine);
-                    menuItem.Loaded += MenuItem_Loaded;
-                }
+                SetTopLine(menuItem, topLine);
+                menuItem.Loaded += MenuItem_Loaded;
             }
         }