DataSet,DataTable,XML格式互转

        //// <summary>

        /// 将DataTable对象转换成XML字符串

        /// </summary>

        /// <param name="dt">DataTable对象</param>

        /// <returns>XML字符串</returns>

        public static string CDataToXml(DataTable dt)

        {

            if (dt != null)

            {

                MemoryStream ms = null;

                XmlTextWriter XmlWt = null;

                try

                {

                    ms = new MemoryStream();

                    //根据ms实例化XmlWt

                    XmlWt = new XmlTextWriter(ms, Encoding.Unicode);

                    //获取ds中的数据

                    dt.WriteXml(XmlWt);

                    int count = (int)ms.Length;

                    byte[] temp = new byte[count];

                    ms.Seek(0, SeekOrigin.Begin);

                    ms.Read(temp, 0, count);

                    //返回Unicode编码的文本

                    UnicodeEncoding ucode = new UnicodeEncoding();

                    string returnValue = ucode.GetString(temp).Trim();

                    return returnValue;

                }

                catch (System.Exception ex)

                {

                    throw ex;

                }

                finally

                {

                    //释放资源

                    if (XmlWt != null)

                    {

                        XmlWt.Close();

                        ms.Close();

                        ms.Dispose();

                    }

                }

            }

            else

            {

                return "";

            }

        }

        /**/

        /// <summary>

        /// 将DataSet对象中指定的Table转换成XML字符串

        /// </summary>

        /// <param name="ds">DataSet对象</param>

        /// <param name="tableIndex">DataSet对象中的Table索引</param>

        /// <returns>XML字符串</returns>

        public static string CDataToXml(DataSet ds, int tableIndex)

        {

            if (tableIndex != -1)

            {

                return CDataToXml(ds.Tables[tableIndex]);

            }

            else

            {

                return CDataToXml(ds.Tables[0]);

            }

        }

        /**/

        /// <summary>

        /// 将DataSet对象转换成XML字符串

        /// </summary>

        /// <param name="ds">DataSet对象</param>

        /// <returns>XML字符串</returns>

        public static string CDataToXml(DataSet ds)

        {

            return CDataToXml(ds, -1);

        }

        /**/

        /// <summary>

        /// 将DataView对象转换成XML字符串

        /// </summary>

        /// <param name="dv">DataView对象</param>

        /// <returns>XML字符串</returns>

        public static string CDataToXml(DataView dv)

        {

            return CDataToXml(dv.Table);

        }



        /**/

        /// <summary>

        /// 将DataSet对象数据保存为XML文件

        /// </summary>

        /// <param name="dt">DataSet</param>

        /// <param name="xmlFilePath">XML文件路径</param>

        /// <returns>bool值</returns>

        public static bool CDataToXmlFile(DataTable dt, string xmlFilePath)

        {

            if ((dt != null) && (!string.IsNullOrEmpty(xmlFilePath)))

            {

                string path = HttpContext.Current.Server.MapPath(xmlFilePath);

                MemoryStream ms = null;

                XmlTextWriter XmlWt = null;

                try

                {

                    ms = new MemoryStream();

                    //根据ms实例化XmlWt

                    XmlWt = new XmlTextWriter(ms, Encoding.Unicode);

                    //获取ds中的数据

                    dt.WriteXml(XmlWt);

                    int count = (int)ms.Length;

                    byte[] temp = new byte[count];

                    ms.Seek(0, SeekOrigin.Begin);

                    ms.Read(temp, 0, count);

                    //返回Unicode编码的文本

                    UnicodeEncoding ucode = new UnicodeEncoding();

                    //写文件

                    StreamWriter sw = new StreamWriter(path);

                    sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");

                    sw.WriteLine(ucode.GetString(temp).Trim());

                    sw.Close();

                    return true;

                }

                catch (System.Exception ex)

                {

                    throw ex;

                }

                finally

                {

                    //释放资源

                    if (XmlWt != null)

                    {

                        XmlWt.Close();

                        ms.Close();

                        ms.Dispose();

                    }

                }

            }

            else

            {

                return false;

            }

        }

        /**/

        /// <summary>

        /// 将DataSet对象中指定的Table转换成XML文件

        /// </summary>

        /// <param name="ds">DataSet对象</param>

        /// <param name="tableIndex">DataSet对象中的Table索引</param>

        /// <param name="xmlFilePath">xml文件路径</param>

        /// <returns>bool]值</returns>

        public static bool CDataToXmlFile(DataSet ds, int tableIndex, string xmlFilePath)

        {

            if (tableIndex != -1)

            {

                return CDataToXmlFile(ds.Tables[tableIndex], xmlFilePath);

            }

            else

            {

                return CDataToXmlFile(ds.Tables[0], xmlFilePath);

            }

        }

        /**/

        /// <summary>

        /// 将DataSet对象转换成XML文件

        /// </summary>

        /// <param name="ds">DataSet对象</param>

        /// <param name="xmlFilePath">xml文件路径</param>

        /// <returns>bool]值</returns>

        public static bool CDataToXmlFile(DataSet ds, string xmlFilePath)

        {

            return CDataToXmlFile(ds, -1, xmlFilePath);

        }

        /**/

        /// <summary>

        /// 将DataView对象转换成XML文件

        /// </summary>

        /// <param name="dv">DataView对象</param>

        /// <param name="xmlFilePath">xml文件路径</param>

        /// <returns>bool]值</returns>

        public static bool CDataToXmlFile(DataView dv, string xmlFilePath)

        {

            return CDataToXmlFile(dv.Table, xmlFilePath);

        }

    

        /**/

        /// <summary>

        /// 将Xml内容字符串转换成DataSet对象

        /// </summary>

        /// <param name="xmlStr">Xml内容字符串</param>

        /// <returns>DataSet对象</returns>

        public static DataSet CXmlToDataSet(string xmlStr)

        {

            if (!string.IsNullOrEmpty(xmlStr))

            {

                StringReader StrStream = null;

                XmlTextReader Xmlrdr = null;

                try

                {

                    DataSet ds = new DataSet();

                    //读取字符串中的信息

                    StrStream = new StringReader(xmlStr);

                    //获取StrStream中的数据

                    Xmlrdr = new XmlTextReader(StrStream);

                    //ds获取Xmlrdr中的数据                

                    ds.ReadXml(Xmlrdr);

                    return ds;

                }

                catch (Exception e)

                {

                    throw e;

                }

                finally

                {

                    //释放资源

                    if (Xmlrdr != null)

                    {

                        Xmlrdr.Close();

                        StrStream.Close();

                        StrStream.Dispose();

                    }

                }

            }

            else

            {

                return null;

            }

        }

        /**/

        /// <summary>

        /// 将Xml字符串转换成DataTable对象

        /// </summary>

        /// <param name="xmlStr">Xml字符串</param>

        /// <param name="tableIndex">Table表索引</param>

        /// <returns>DataTable对象</returns>

        public static DataTable CXmlToDatatTable(string xmlStr, int tableIndex)

        {

            return CXmlToDataSet(xmlStr).Tables[tableIndex];

        }

        /**/

        /// <summary>

        /// 将Xml字符串转换成DataTable对象

        /// </summary>

        /// <param name="xmlStr">Xml字符串</param>

        /// <returns>DataTable对象</returns>

        public static DataTable CXmlToDatatTable(string xmlStr)

        {

            return CXmlToDataSet(xmlStr).Tables[0];

        }

        /**/

        /// <summary>

        /// 读取Xml文件信息,并转换成DataSet对象

        /// </summary>

        /// <remarks>

        /// DataSet ds = new DataSet();

        /// ds = CXmlFileToDataSet("/XML/upload.xml");

        /// </remarks>

        /// <param name="xmlFilePath">Xml文件地址</param>

        /// <returns>DataSet对象</returns>

        public static DataSet CXmlFileToDataSet(string xmlFilePath)

        {

            if (!string.IsNullOrEmpty(xmlFilePath))

            {

                string path = HttpContext.Current.Server.MapPath(xmlFilePath);

                StringReader StrStream = null;

                XmlTextReader Xmlrdr = null;

                try

                {

                    XmlDocument xmldoc = new XmlDocument();

                    //根据地址加载Xml文件

                    xmldoc.Load(path);



                    DataSet ds = new DataSet();

                    //读取文件中的字符流

                    StrStream = new StringReader(xmldoc.InnerXml);

                    //获取StrStream中的数据

                    Xmlrdr = new XmlTextReader(StrStream);

                    //ds获取Xmlrdr中的数据

                    ds.ReadXml(Xmlrdr);

                    return ds;

                }

                catch (Exception e)

                {

                    throw e;

                }

                finally

                {

                    //释放资源

                    if (Xmlrdr != null)

                    {

                        Xmlrdr.Close();

                        StrStream.Close();

                        StrStream.Dispose();

                    }

                }

            }

            else

            {

                return null;

            }

        }

        /**/

        /// <summary>

        /// 读取Xml文件信息,并转换成DataTable对象

        /// </summary>

        /// <param name="xmlFilePath">xml文江路径</param>

        /// <param name="tableIndex">Table索引</param>

        /// <returns>DataTable对象</returns>

        public static DataTable CXmlToDataTable(string xmlFilePath, int tableIndex)

        {

            return CXmlFileToDataSet(xmlFilePath).Tables[tableIndex];

        }

        /**/

        /// <summary>

        /// 读取Xml文件信息,并转换成DataTable对象

        /// </summary>

        /// <param name="xmlFilePath">xml文江路径</param>

        /// <returns>DataTable对象</returns>

        public static DataTable CXmlToDataTable(string xmlFilePath)

        {

            return CXmlFileToDataSet(xmlFilePath).Tables[0];

        }