long fileSize = helper.GetFileSize(dir+"/Release.exe");  //獲得更新程序文件大小
        fileSizes = fileSize;
        if (fileSize > 0)
        {
          updateLabelDelegate("發(fā)現(xiàn)最新版本"+ serVer + "！文件大小:" + fileSize+"字節(jié)"); //更新界面label控件的委托
          int readSize = 0;
          bool result = false;
          using (FileStream fs = new FileStream("Release.exe", FileMode.Create))
          {
            string url = "ftp://" + ftpAddress + "/"+dir+"/Release.exe";
            Console.WriteLine(url);
            FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
            request.Credentials = new NetworkCredential(ftpUserName, ftpPassword);
            request.Method = WebRequestMethods.Ftp.DownloadFile; ;
            Console.WriteLine(request);
            request.ContentOffset = fs.Length;
            updateLabelDelegate("正在下載新版本... 0字節(jié)/" + fileSize + "字節(jié)");　　
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
              fs.Position = fs.Length;
              byte[] buffer = new byte[1024*2];
              int count = response.GetResponseStream().Read(buffer, 0, buffer.Length);
              while (count > 0)
              {
                fs.Write(buffer, 0, count);
                count = response.GetResponseStream().Read(buffer, 0, buffer.Length);
                readSize += count;
                double pa = (((double)readSize / (double)fileSizes) * 100);
                updateProgDelegate((int)pa) ; //更新進度條的委托
                UpdateUILabel("正在下載更新..."+ (readSize) + "字節(jié)/" + (fileSize) + "字節(jié)");
                Application.DoEvents();
              }
              UpdateUILabel("下載完成，正在安裝新版本，請稍等..." + (fileSize) + "字節(jié)/" + (fileSize) + "字節(jié)");
              updateProgDelegate(100);
              response.GetResponseStream().Close();
            }
          }
          Process p = Process.Start("Release.exe");  //下載完成后調(diào)用自解壓包
          p.WaitForExit();  //等待自解壓包解壓完成


 　　　　　p.StartInfo.FileName = "BarcodeMain.exe";//啟動主程序
        　　　　p.StartInfo.Arguments = "update";//傳遞主啟動程序的參數(shù)，以免啟動主程序后再次啟動更新程序
        　　　　p.Start();//啟動 
   this.Close();    //關(guān)閉更新程序窗口

[STAThread]
static void Main(string[] arg) //接受參數(shù)
{
  Application.EnableVisualStyles();
  Application.SetCompatibleTextRenderingDefault(false);
  Application.Run(new Index(arg)); //傳遞給主程序窗體的構(gòu)造函數(shù)
}

private string[] targ ; //接收的參數(shù)
public Index()
{
  InitializeComponent();
}
public Index(string[] arg) //帶參數(shù)的構(gòu)造函數(shù)
{
  InitializeComponent();
  targ = arg;
}

//檢查執(zhí)行參數(shù)　    
private static System.Diagnostics.Process p;
if (targ.Length==0)  //如果沒有傳遞參數(shù)，則調(diào)用update程序
 {
    if (p == null)
   {
     p = new System.Diagnostics.Process();
      p.StartInfo.FileName = "UpdatePrg.exe";
      p.Start();
      Application.Exit();
        }
        else
        {
          if (p.HasExited) //是否正在運行
        {
        p.Start();
       }
     }
  p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
}