送給大家一個XML與DataSet的相互轉換的類:
XmlDatasetConvert 該類提供了四種方法：
1、將xml對象內容字符串轉換為DataSet
2、將xml文件轉換為DataSet
3、將DataSet轉換為xml對象字符串
4、將DataSet轉換為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
??? {
??????? //將xml對象內容字符串轉換為DataSet
??????? public static DataSet ConvertXMLToDataSet(string xmlData)
??????? {
??????????? StringReader stream = null;
??????????? XmlTextReader reader = null;
??????????? try
??????????? {
??????????????? DataSet xmlDS = new DataSet();
??????????????? stream = new StringReader(xmlData);
??????????????? //從stream裝載到XmlTextReader
??????????????? reader = new XmlTextReader(stream);
??????????????? xmlDS.ReadXml(reader);
??????????????? return xmlDS;
??????????? }
??????????? catch (System.Exception ex)
??????????? {
??????????????? throw ex;
??????????? }
??????????? finally
??????????? {
??????????????? if (reader != null) reader.Close();
??????????? }
??????? }

??????? //將xml文件轉換為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);
??????????????? //從stream裝載到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();
??????????? }
??????? }

??????? //將DataSet轉換為xml對象字符串
??????? public static string ConvertDataSetToXML(DataSet xmlDS)
??????? {
??????????? MemoryStream stream = null;
??????????? XmlTextWriter writer = null;

??????????? try
??????????? {
??????????????? stream = new MemoryStream();
??????????????? //從stream裝載到XmlTextReader
??????????????? writer = new XmlTextWriter(stream, Encoding.Unicode);

??????????????? //用WriteXml方法寫入文件.
??????????????? 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();
??????????? }
??????? }

??????? //將DataSet轉換為xml文件
??????? public static void ConvertDataSetToXMLFile(DataSet xmlDS,string xmlFile)
??????? {
??????????? MemoryStream stream = null;
??????????? XmlTextWriter writer = null;

??????????? try
??????????? {
??????????????? stream = new MemoryStream();
??????????????? //從stream裝載到XmlTextReader
??????????????? writer = new XmlTextWriter(stream, Encoding.Unicode);

??????????????? //用WriteXml方法寫入文件.
??????????????? 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編碼的文本
??????????????? 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();
??????????? }
??????? }

??? }
}

使用示例
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();

??????????? 轉換一個XML文件(本地/網絡均可)為一個DataSet#region 轉換一個XML文件(本地/網絡均可)為一個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("數據集名為/"{0}/",包含{1}個表", ds.DataSetName, ds.Tables.Count);
??????????? foreach(DataTable dt in ds.Tables)
??????????? {
??????????????? PrintTableName(dt.TableName);
??????????? };
??????????? #endregion

??????????? 構造一個DataSet,并轉換為XML字符串#region 構造一個DataSet,并轉換為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", "書本1");
??????????? dt2.Rows.Add("b002", "書本2");

??????????? ds1.Tables.Add(dt1);
??????????? ds1.Tables.Add(dt2);
??????????? ds1.DataSetName = "方案";
??????????? string xmlOut = XmlDatasetConvert.ConvertDataSetToXML(ds1);
??????????? #endregion

??????????? 轉換一個XML字符串為一個DataSet#region 轉換一個XML字符串為一個DataSet
??????????? DataSet ds2 = new DataSet();
??????????? ds2 = XmlDatasetConvert.ConvertXMLToDataSet(xmlOut);
??????????? Console.WriteLine("數據集名為/"{0}/",包含{1}個表", ds2.DataSetName, ds2.Tables.Count);
??????????? foreach (DataTable dt in ds2.Tables)
??????????? {
??????????????? PrintTableName(dt.TableName);
??????????? };
??????????? #endregion

??????????? 轉換一個Dataset為一個XML文件#region 轉換一個Dataset為一個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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