HtmlEditor类对象说明之Document对象

  /// <summary>
        /// 表示开始进行重做单元
        /// </summary>
        /// <param name="title"></param>
        private void StartUndoUnit(string title = "coolform")
        {
            var ims = htmlDesignEditor.Document as IMarkupServices2;
            ims.BeginUndoUnit(title);
        }

        /// <summary>
        /// 表示结束进行重做单元
        /// </summary>
        private void EndUndoUnit()
        {
            var ims = htmlDesignEditor.Document as IMarkupServices2;
            ims.EndUndoUnit();
        }