/// <summary>
        /// 获取注释
        /// </summary>
        /// <param name="propertyInfo"></param>
        /// <returns></returns>
        public static string GetComments(this PropertyInfo propertyInfo)
        {
            XPathNavigator navigator = GetXmlDoc(propertyInfo)?.CreateNavigator();

            if (navigator == null)
            {
                return(string.Empty);
            }
            var commentId = XmlCommentsIdHelper.GetCommentIdForProperty(propertyInfo);
            var node      = navigator.SelectSingleNode(string.Format(MemberXPath, commentId));

            if (node != null)
            {
                var summaryNode = node.SelectSingleNode(SummaryTag);
                if (summaryNode != null)
                {
                    return(summaryNode.ExtractContent());
                }
            }
            return("");
        }