xml转换DataSet

#region xml转换DataSet
        /// <summary>
        /// 固定格式xml转换DataSet
        /// </summary>
        /// <param name="result"></param>
        /// <returns></returns>
        private DataSet ReturnDS(string result)
        {
            StringReader stream = null;
            XmlTextReader reader = null;
            try
            {
                DataSet xmlDS = new DataSet();
                stream = new StringReader(result);
                //从stream装载到XmlTextReader
                reader = new XmlTextReader(stream);
                xmlDS.ReadXml(reader);
                return xmlDS;
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (reader != null) reader.Close();
            }

        }
        #endregion