/// <summary>
    /// 禁用嵌套页面的右键菜单
    /// </summary>
    public class MenuHandler : IContextMenuHandler
    {
        public void OnBeforeContextMenu(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, IMenuModel model)
        {
            model.Clear();
        }
        public bool OnContextMenuCommand(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, CefMenuCommand commandId, CefEventFlags eventFlags)
        {
            return false;
        }
        public void OnContextMenuDismissed(IWebBrowser browserControl, IBrowser browser, IFrame frame)
        {
        }
        public bool RunContextMenu(IWebBrowser browserControl, IBrowser browser, IFrame frame, IContextMenuParams parameters, IMenuModel model, IRunContextMenuCallback callback)
        {
            return false;
        }
    }

ChromiumWebBrowser 禁用右键菜单