/// <summary>
        /// 获取XML数据库中的数据的方法
        /// </summary>
        /// <param name="strFilePath">传入文件路径</param>
        /// <returns>返回一个数据集</returns>
        public static DataSet GetAllDataFromXML(string strFilePath)
        {
            DataSet ds = new DataSet();
            FileInfo fileInfo = new FileInfo(strFilePath);
            if (fileInfo.Exists)
            {
                try
                {
                    ds.ReadXml(strFilePath);
                }
                catch { }
            }
            else
            {
                ds = null;
            }
            if (ds != null)
            {
                if (ds.Tables[0].Rows.Count < 1)
                    ds = null;
            }
            return ds;
        }

------解决方案--------------------

C# code
 //将xml文件转换为DataSet
        public static DataSet ConvertXMLFileToDataSet(string xmlFile)
        {
            StringReader stream = null;
            XmlTextReader reader = null;
            try
            {
                XmlDocument xmld = new XmlDocument();
                xmld.Load(xmlFile);

                DataSet xmlDS = new DataSet();
                stream = new StringReader(xmld.InnerXml);
                //从stream装载到XmlTextReader
                reader = new XmlTextReader(stream);
                xmlDS.ReadXml(reader);
                //xmlDS.ReadXml(xmlFile);
                return xmlDS;
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (reader != null) reader.Close();
            }
        }