ASP.NET中XML与DataSet的相互转换
ASP.NET中XML与DataSet的相互转换一、XML 与 DataSet 的关系如下图所示：
二、DataSet 对象的常用方法如下：
A. 使用ReadXml( ) 方法：
从文件或流中加载XML 数据，填充DataSet 对象。DataSet 对象.ReadXML( 文件路径字符串|stream 对象, XmlReadMode 枚举值[可以省略] ) ;
B. 使用WriteXml( ) 方法：
将DataSet 对象中的数据以XML 格式写出到文件或流中。DataSet 对象.WriteXml( 文件路径字符串| stream 对象, XmlWriteMode 枚举值[可以省略] ) ;
C. 使用ReadXmlSchema( ) 方法：
将Shema 模式文件读入DataSet 对象。DataSet 对象.ReadXmlSchema( Stream | FileName | TextReader | XmlReader ) ;
D. 使用WriteXmlSchema( ) 方法：
将DataSet 对象的Shema 模式文件写出到文件或流。DataSet 对象.WriteXmlSchema( Stream | FileName | TextWriter | XmlWriter ) ;
E. 使用GetXmlSchema( ) 方法：
将DataSet 对象的Shema 模式，以字符串的形式获得。DataSet 对象.GetXmlSchema( );
F. 使用GetXml( ) 方法：
将DataSet 对象的XML 格式的数据集，以字符串的形式获得。DataSet 对象.GetXml( );
三、XML与DataSet的相互转换的类
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();
}
}
}
}
四、该方法的使用示例
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 构造一个DataSet,并转换为XML字符串
构造一个DataSet,并转换为XML字符串