XML与DataSet的相互转换

from:http://www.cnblogs.com/guoerzzf/archive/2009/04/09/1432668.html

XmlDatasetConvert 该类提供了四种方法：

    1、将xml对象内容字符串转换为DataSet
    2、将xml文件转换为DataSet
    3、将DataSet转换为xml对象字符串
    4、将DataSet转换为xml文件

XmlDatasetConvert.cs

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.IO;

using System.Xml;

namespace XmlDesign

{

    class XmlDatasetConvert

    {

        //将xml对象内容字符串转换为DataSet

        public static DataSet ConvertXMLToDataSet(string xmlData)

        {

            StringReader stream = null;

            XmlTextReader reader = null;

            try

            {

                DataSet xmlDS = new DataSet();

                stream = new StringReader(xmlData);

                //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();

            }

        }

        //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();

            }

        }

        //将DataSet转换为xml对象字符串

        public static string ConvertDataSetToXML(DataSet xmlDS)

        {

            MemoryStream stream = null;

            XmlTextWriter writer = null;

            try

            {

                stream = new MemoryStream();

                //从stream装载到XmlTextReader

                writer = new XmlTextWriter(stream, Encoding.Unicode);

                //用WriteXml方法写入文件.

                xmlDS.WriteXml(writer);

                int count = (int) stream.Length;

                byte[] arr = new byte[count];

                stream.Seek(0, SeekOrigin.Begin);

                stream.Read(arr, 0, count);

                UnicodeEncoding utf = new UnicodeEncoding();

                return utf.GetString(arr).Trim();

            }

            catch (System.Exception ex)

            {

                throw ex;

            }

            finally

            {

                if (writer != null)

                    writer.Close();

            }

        }

        //将DataSet转换为xml文件

        public static void ConvertDataSetToXMLFile(DataSet xmlDS, string xmlFile)

        {

            MemoryStream stream = null;

            XmlTextWriter writer = null;

            try

            {

                stream = new MemoryStream();

                //从stream装载到XmlTextReader

                writer = new XmlTextWriter(stream, Encoding.Unicode);

                //用WriteXml方法写入文件.

                xmlDS.WriteXml(writer);

                int count = (int) stream.Length;

                byte[] arr = new byte[count];

                stream.Seek(0, SeekOrigin.Begin);

                stream.Read(arr, 0, count);

                //返回Unicode编码的文本

                UnicodeEncoding utf = new UnicodeEncoding();

                StreamWriter sw = new StreamWriter(xmlFile);

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

                sw.WriteLine(utf.GetString(arr).Trim());

                sw.Close();

            }

            catch (System.Exception ex)

            {

                throw ex;

            }

            finally

            {

                if (writer != null)

                    writer.Close();

            }

        }

    }

}

 

使用例子

using System;

using System.Collections.Generic;

using System.Text;

using System.Xml;

using System.Data;

namespace XmlDesign

{

    class Program

    {

        static void Main(string[] args)

        {

            DataSet ds = new DataSet();

            #region 转换一个XML文件(本地\网络均可)为一个DataSet

            //http://news.baidu.com/n?cmd=1&class=sportnews&tn=rss

            //F:\study\001CSharp_Study\002Source\XmlDesign\XmlDesign\Save_Plan.xml

            ds = XmlDatasetConvert.ConvertXMLFileToDataSet(@"http://news.baidu.com/n?cmd=1&class=sportnews&tn=rss");

            Console.WriteLine("数据集名为\"{0}\",包含{1}个表", ds.DataSetName, ds.Tables.Count);

            foreach (DataTable dt in ds.Tables)

            {

                PrintTableName(dt.TableName);

            }

            #endregion

            #region 构造一个DataSet,并转换为XML字符串

            DataSet ds1 = new DataSet();

            DataTable dt1 = new DataTable();

            dt1.TableName = "test";

            dt1.Columns.Add("id");

            dt1.Columns.Add("name");

            dt1.Rows.Add("i001", "hekui");

            dt1.Rows.Add("i002", "liyang");

            DataTable dt2 = new DataTable();

            dt2.TableName = "test1";

            dt2.Columns.Add("bookid");

            dt2.Columns.Add("bookname");

            dt2.Rows.Add("b001", "书本1");

            dt2.Rows.Add("b002", "书本2");

            ds1.Tables.Add(dt1);

            ds1.Tables.Add(dt2);

            ds1.DataSetName = "方案";

            string xmlOut = XmlDatasetConvert.ConvertDataSetToXML(ds1);

            #endregion

            #region 转换一个XML字符串为一个DataSet

            DataSet ds2 = new DataSet();

            ds2 = XmlDatasetConvert.ConvertXMLToDataSet(xmlOut);

            Console.WriteLine("数据集名为\"{0}\",包含{1}个表", ds2.DataSetName, ds2.Tables.Count);

            foreach (DataTable dt in ds2.Tables)

            {

                PrintTableName(dt.TableName);

            }

            #endregion

            #region 转换一个Dataset为一个XML文件

            XmlDatasetConvert.ConvertDataSetToXMLFile(ds2, "c:\\adadsda1.xml");

            #endregion

            Console.ReadLine();

        }

        private static void PrintTableName(string tableName)

        {

            Console.WriteLine(tableName);

        }

    }

}

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