添加项目文件。

GroupLine.App/View/UserControlMenuItem.xaml.cs

@@ -0,0 +1,30 @@
+using GroupLine.App.ViewModel;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace GroupLine.App.View
+{
+    /// <summary>
+    /// UserControlMenuItem.xaml 的交互逻辑
+    /// </summary>
+    public partial class UserControlMenuItem : UserControl
+    {
+        MainWindow _context;
+
+        public UserControlMenuItem(ItemMenu itemMenu, MainWindow context)
+        {
+            InitializeComponent();
+            _context = context;
+
+            ExpanderMenu.Visibility = itemMenu.SubItems == null ? Visibility.Collapsed : Visibility.Visible;
+            ListViewItemMenu.Visibility = itemMenu.SubItems == null ? Visibility.Visible : Visibility.Collapsed;
+
+            this.DataContext = itemMenu;
+        }
+        private void ListViewMenu_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            _context.SwitchScreen(((SubItem)((ListView)sender).SelectedItem).Screen);
+            //ListViewMenu.SelectedIndex = -1;
+        }
+    }
+}