导出一个XML文件并提供下载的代码,下载的代码可通用

using System.IO;
  private void Button2_Click(object sender, System.EventArgs e)
  {
   GetData();
   initDataGrid();
   string phyPath=Server.MapPath("./");
//   phyPath=phyPath.Substring(1);
//   Response.Write("<script language=javascript>alert('"+phyPath+"');</script>");
//   return;
   if (this.ds.Tables[0].Rows.Count<=0)
   {
    Response.Write("<script language=javascript>alert('无记录！');</script>");
    return ;
   }
   this.ds.WriteXml(phyPath+"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.xml",XmlWriteMode.WriteSchema);
   Response.Write("<script language=javascript>alert('export success');</script>");
   GetExcel(phyPath+"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.xml",this.Page);
  }
  public static void GetExcel(string filename,Page p1)
  {
   string t_name=filename.Substring(filename.LastIndexOf(@"/")+1);
   p1.Response.Clear();
   p1.Response.Buffer= true;
   p1.Response.Charset="gb2312";
   p1.Response.AppendHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlEncode(t_name));
   p1.Response.ContentEncoding=System.Text.Encoding.GetEncoding("gb2312");
   p1.Response.ContentType = "application/ms-excel";
   p1.EnableViewState = false;

   FileInfo fn=new FileInfo(filename);

   FileStream fs=fn.OpenRead();

   byte[] buffer=new byte[fn.Length];
   fs.Read(buffer,0,buffer.Length);
   fs.Close();
   
   p1.Response.BinaryWrite(buffer);
   p1.Response.End();

  
  }