如何用C#将数据库中的记录制成XML

　　
    以前在一个公司项目中要用数据库中的记录生成相应的XML文件[主要是为了提高访问速度],但由于当时资料的缺乏,在开发过程中遇到了不过的困难,好在最终完成了工作,我在这里把当时其中的一个功能函数列出来,其于的函数大同小意,希望兄弟们以后在遇到这样的问题时不象我当初一样再吃苦头.
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Web;
using System.Web.Services;
using System.Xml;
using System.Data.SqlClient;
using System.Configuration;
using System.Text;
using System.Xml.Xsl;
using System.IO;
namespace admin
{
/// <summary>
/// CreateXML 的摘要说明。
/// </summary>
///
  [System.Web.Services.WebService(Namespace="http://..../admin/createxml.asmx",Description="生成或更新星迷俱乐部中的xml文件")]
public class CreateXML : System.Web.Services.WebService
{
  public CreateXML()
  {
   //CODEGEN: 该调用是 ASP.NET Web 服务设计器所必需的
   InitializeComponent();
  }
  #region 组件设计器生成的代码
  
  //Web 服务设计器所必需的
  private IContainer components = null;
   
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
  }
  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if(disposing && components != null)
   {
    components.Dispose();
   }
   base.Dispose(disposing);  
  }
  
  #endregion
  [WebMethod]
  public string CreateClubXMLByID(String ID)
  {  
   DateTime filenamedate=DateTime.Now;
   CreatePath("..\\"+filenamedate.Year.ToString(),filenamedate.Month.ToString()+"_"+filenamedate.Day.ToString());//按时期生成相应的时期型文件夹
   string filename=Server.MapPath("..\\"+filenamedate.Year.ToString()+"[url=file://\\]\\"+filenamedate.Month.ToString()+"_"+filenamedate.Day.ToString()+"\\Club"+ID.Trim()+".xml[/url]");  
   XmlTextWriter PicXmlWriter = null;
   Encoding GB = Encoding.GetEncoding("GB2312");
   PicXmlWriter = new XmlTextWriter (filename,GB);
   
   try
   {
    string strConn=ConfigurationSettings.AppSettings["starclub"];
     
    String SQLStatement="SELECT * FROM  club where id="+ID.ToString().Trim();
    SqlConnection myConnection= new SqlConnection(strConn);
    SqlDataAdapter myCommand = new SqlDataAdapter(SQLStatement,myConnection);
    DataSet myDataSet;
    myCommand.SelectCommand.CommandType=CommandType.Text;
    myDataSet = new DataSet();
    myCommand.Fill(myDataSet, "MyTable");

    PicXmlWriter.Formatting = Formatting.Indented;
    PicXmlWriter.Indentation= 6;
    PicXmlWriter.Namespaces = false;
    PicXmlWriter.WriteStartDocument();
    //PicXmlWriter.WriteDocType("文档类型", null, ".xml", null);
    //PicXmlWriter.WriteComment("按在数据库中记录的ID进行记录读写");
    PicXmlWriter.WriteProcessingInstruction("xml-stylesheet","type='text/xsl' href='../../xsl/1.xsl'") ;  //写入用于解释的XSL文件名
    PicXmlWriter.WriteStartElement("","club","");
    foreach(DataRow r in myDataSet.Tables[0].Rows)   //依次取出所有行
    {
      PicXmlWriter.WriteStartElement("","record","");
     foreach(DataColumn c in myDataSet.Tables[0].Columns)  //依次找出当前记录的所有列属性
     {
      if ((c.Caption.ToString()!="pic"))
      {
       PicXmlWriter.WriteStartElement("",c.Caption.ToString().Trim(),"");  //写入字段名
       PicXmlWriter.WriteString(r[c].ToString().Trim());   //写入数据
       PicXmlWriter.WriteEndElement();
      }
      else
      {
       PicXmlWriter.WriteStartElement("",c.Caption.ToString().Trim(),"");
       string [] pic=r[c].ToString().Trim().Split('|');
       for (int i=0;i<pic.Length;i++)
       {
        
        if (pic.Trim()!="")   //数据库中图片字段的插入格式为:  文件名,高,宽|  以此类推. 例如  no.jpg,132,142|
        {
         PicXmlWriter.WriteStartElement("",c.Caption.ToString().Trim()+"s","");
         string [] picstr=pic.Split(',');
         PicXmlWriter.WriteStartElement("","picstr","");
         PicXmlWriter.WriteString(picstr[0].Trim().Trim());
         PicXmlWriter.WriteEndElement();
         PicXmlWriter.WriteStartElement("","height","");
         PicXmlWriter.WriteString(picstr[1].Trim().Trim());
         PicXmlWriter.WriteEndElement();
         PicXmlWriter.WriteStartElement("","width","");
         PicXmlWriter.WriteString(picstr[1].Trim().Trim());
         PicXmlWriter.WriteEndElement();
         
         PicXmlWriter.WriteStartElement("","comment","");
         PicXmlWriter.WriteString(pic[++i].Trim().Trim());
         PicXmlWriter.WriteEndElement();
         PicXmlWriter.WriteEndElement();

        }
        else
        {
         i++;
        }
        
       }
       PicXmlWriter.WriteEndElement();
      
      }
     }
     PicXmlWriter.WriteEndElement();
    }
               
    PicXmlWriter.WriteEndElement();
    PicXmlWriter.Flush();
   
   }
   catch (Exception e)
   {
    Console.WriteLine ("异常：{0}", e.ToString());
   }
   finally
   {
    Console.WriteLine();
    Console.WriteLine("对文件 {0} 的处理已完成。", ID);
    if (PicXmlWriter != null)
     PicXmlWriter.Close();
    //关闭编写器
    if (PicXmlWriter != null)
     PicXmlWriter.Close();
   }
   return filenamedate.Year.ToString()+"[url=file://\\]\\"+filenamedate.Month.ToString()+"_"+filenamedate.Day.ToString()+"\\Club"+ID.Trim()+".xml[/url]";
  }

public void CreatePath(string yearpath,string monthdaycurrent)
  {   
   string path=Server.MapPath("");
   if (Directory.Exists(path+yearpath))
   {
    if (Directory.Exists(path+yearpath+monthdaycurrent))
    {
     ;
    }
    else
    {
     Directory.CreateDirectory(path+"[url=file://\\]\\"+yearpath+"\\"+monthdaycurrent[/url]);
    }
   }
   else
   {
    Directory.CreateDirectory(path+"[url=file://\\]\\"+yearpath+"\\"+monthdaycurrent[/url]);
   }