1.为chromiumWebBrower组件指定菜单处理类1

 chromiumWebBrowser1.MenuHandler = new MenuHandler();

2.MenuHandler类实现如下

  public class MenuHandler : IContextMenuHandler
  {
      public void OnBeforeContextMenu(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, IMenuModel model)
      {

           
          //清除其他菜单项，这里不清除会出现奇怪的空白项
          model.Clear();
 
          //判断是否有选中文字，选中了才显示复制剪切
          if (!String.IsNullOrEmpty(parameters.SelectionText))
          {
              model.AddItem(CefMenuCommand.Cut, "剪切");
              model.AddItem(CefMenuCommand.Copy, "复制");
          }
          //判断是否在编辑框中，在才显示粘贴
          if (parameters.IsEditable)
          {
              model.AddItem(CefMenuCommand.Paste, "粘贴");
          }
          
          //上面可以按自己需要来控制显示项以及添加其他项


       
          // Optionally handle the context menu model in here. See https://bitbucket.org/chromiumembedded/cef/wiki/ContextMenu.md
          // For example, you can modify the model or disable it completely.
      }

      public bool OnContextMenuCommand(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, CefMenuCommand commandId, CefEventFlags eventFlags)
      {
          // Handle the menu command
          //处理菜单命令，CefMenuCommand下枚举的不需要额外处理，只需要对自定义的命令进行处理就行

          return false;
      }

      public void OnContextMenuDismissed(IWebBrowser browserControl, IBrowser browser, IFrame frame)
      {
          // Optionally handle the context menu dismissal.
          var webBrowser = (ChromiumWebBrowser)browserControl;
          webBrowser.Dispatcher.Invoke(() =>
          {
              webBrowser.ContextMenu = null;
          });
      }

      public bool RunContextMenu(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, IMenuModel model, IRunContextMenuCallback callback)
      {
     
          return false;
      }
 
  }