[SharpDevelop]菜单状态更新

方式一

在Idle方法中更新

 void OnApplicationIdle(object sender, EventArgs e)
         {
             // Use the Idle event to update the status of menu and toolbar.
             // Depending on your application and the number of menu items with complex conditions,
             // you might want to update the status less frequently.
             UpdateMenuItemStatus();
         }

         /// <summary>Update Enabled/Visible state of items in the main menu based on conditions</summary>
         void UpdateMenuItemStatus()
         {
             foreach (ToolStripItem item in menu.Items) {
                 if (item is IStatusUpdate)
                     (item as IStatusUpdate).UpdateStatus();
             }
         }

方式二

sealed class DefaultWorkbench : Form, IWorkbench

通过一个Timer来更新

 toolbarUpdateTimer =  new System.Windows.Forms.Timer();
 toolbarUpdateTimer.Tick += new EventHandler(UpdateMenu);

 void UpdateMenu(object sender, EventArgs e)
         {
             UpdateMenus();
             UpdateToolbars();
         }

         void UpdateMenus()
         {
             // update menu
             foreach (object o in TopMenu.Items) {
                 if (o is IStatusUpdate) {
                     ((IStatusUpdate)o).UpdateStatus();
                 }
             }
         }

         void UpdateToolbars()
         {
             if (ToolBars != null) {
                 foreach (ToolStrip toolStrip in ToolBars) {
                     ToolbarService.UpdateToolbar(toolStrip);
                 }
             }
         }

方式三

sealed partial class WpfWorkbench : FullScreenEnabledWindow, IWorkbench, System.Windows.Forms.IWin32Window

   requerySuggestedEventHandler = new EventHandler(CommandManager_RequerySuggested);
   CommandManager.RequerySuggested += requerySuggestedEventHandler;

 EventHandler requerySuggestedEventHandler;

 void CommandManager_RequerySuggested(object sender, EventArgs e)
 {
     UpdateMenu();
 }
 void UpdateMenu()
 {
     MenuService.UpdateStatus(mainMenu.ItemsSource);
         foreach (ToolBar tb in toolBars)
         {
     ToolBarService.UpdateStatus(tb.ItemsSource);
     }
 }