string postStr = "";           Stream s = System.Web.HttpContext.Current.Request.InputStream;            byte[] b = new byte[s.Length];            s.Read(b, 0, (int)s.Length);            postStr = Encoding.UTF8.GetString(b);            if (!string.IsNullOrEmpty(postStr))            {                XmlDocument doc = new XmlDocument();                doc.LoadXml(postStr);                XmlElement rootElement = doc.DocumentElement;                //XmlNode MsgType = rootElement.SelectSingleNode("MsgType");                RequestXML requestXML = new RequestXML();                requestXML.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText;                requestXML.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText;                requestXML.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText;                requestXML.MsgType = rootElement.SelectSingleNode("MsgType").InnerText;            }