DataSet转换为xml文件
//将DataSet转换为xml文件
private 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,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.Flush();
sw.Close();
}
catch (System.Exception ex)
{
throw ex;
}
finally
{
if (writer != null) writer.Close();
}
}

XML与DataSet的相互转换类 （转）
送给大家一个XML与DataSet的相互转换的类:
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,sans-serif; font-size:13px"> 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;

//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();

转换一个XML文件(本地\网络均可)为一个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

构造一个DataSet,并转换为XML字符串#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

转换一个XML字符串为一个DataSet#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}\",ds2.DataSetName,ds2.Tables.Count);
foreach (DataTable dt in ds2.Tables)
{
PrintTableName(dt.TableName);
};
#endregion

转换一个Dataset为一个XML文件#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); } } }