Dictionary<string, RibbonControl> ribbonControls = new Dictionary<string, RibbonControl>();

 private void tabMain_SelectedPageChanged(object sender, TabPageChangedEventArgs e)
        {
            RibbonControl rc = null;

            string preName = (e.PrevPage == null) ? "" : e.PrevPage.Name;
            if (!string.IsNullOrEmpty(preName))
            {
                string preKey = preName.Substring(8);//分割
                if (ribbonControls.ContainsKey(preKey))//ContainsKey用来判断map集合
                    rc = ribbonControls[preKey];
            }

            ClearMainRibbonGroup(rc);//从MainRibbonControl头部中移出

            string currentPageName = (e.Page == null) ? "" : e.Page.Name;
            if (string.IsNullOrEmpty(currentPageName))
                return;

            string key = currentPageName.Substring(8);
            bool isActived = false;
            if (!ribbonControls.ContainsKey(key))
                return;

            rc = ribbonControls[key];
            int index = 1;

            List<RibbonPage> ribbonPages = new List<RibbonPage>();
            foreach (RibbonPage page in rc.Pages)
            {
                ribbonPages.Add(page);
            }

            foreach (RibbonPage page in ribbonPages)
            {
                rbControlMain.Pages.Insert(index, page); // rc.Pages 每次迭代后，该集合会自动删除，这是什么原因？请各位发表自己的见解
                if (!isActived)
                {
                    rbControlMain.SelectedPage = page;
                    isActived = true;
                }
                index++;
            }


        }