HTML格式化为标准XML

SgmlReaderDll 
 /// <summary>
        /// 把html转成XML
        /// </summary>
        /// <param name="html"></param>
        /// <returns></returns>
        private static XElement Html2XML(string html)
        {
            Sgml.SgmlReader sgmlReader = new Sgml.SgmlReader();
            sgmlReader.DocType = "HTML";
            sgmlReader.WhitespaceHandling = WhitespaceHandling.All;
            sgmlReader.CaseFolding = Sgml.CaseFolding.ToLower;
            sgmlReader.InputStream = new StringReader(html);
            return XElement.Load(sgmlReader);
        }