DataSet 读取xml 报错有非法字符

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private void Bind()

        {

            string strLogPath = ConfigurationSettings.AppSettings["LOG_PATH"].ToString();

            if (strLogPath.Length >  && strLogPath[strLogPath.Length - ] != '\\')

                strLogPath += '\\';

            string strXMLUrl = String.Format("{0}{1}.xml", strLogPath, DateTime.Now.ToString("yyyyMMdd"));

            string xmlContent = Common.Library.ReadFileAbsolute(strXMLUrl, ASCIIEncoding.GetEncoding("GB2312")).Replace("\r\n", "");

            StringReader strReader = new StringReader(xmlContent);

            DataSet ds = new DataSet();

            ds.ReadXml(strReader);

            DataTable dt = ds.Tables["item"];

        }

ds.ReadXml(xmlContent);直接读取要报错有非法字符

所以在read之前用流来读一次

StringReader strReader = new StringReader(xmlContent);

问题结局。原理自己google吧。