C#下实现在线升级

//这是一个webservice

private appupdate.updateserv  updatesvr;

  private void button1_click(object sender, system.eventargs e)
  {
   
   if(linkwebservices()==true)
   {
    this.label1.text="连接服务器....... pass";
    
    if(checkver()==true)
    {
     this.label2.text="检查最新版本并下载.......pass";
                  
    }
    else
    {
     this.label2.text="检查最新版本并下载.......fail";
    }
   }
   else
   {
    this.label1.text="连接服务器.......fail";
   }
  }

//这是用来与升级服务器建立连接
  private bool linkwebservices()
  {
   try
   {
    updatesvr=new updateserv();
    return true;
   }
   catch
   {
    return false;
   }
  }

//调用webservice用来检查是不是有最新的版本
  private bool checkver()
  {
   string path =application.startuppath;
   try
   {
    versioncheck(path);
    return true;
   }
   catch(exception ex)
   {
    messagebox.show(ex.tostring());
    return false;
   }
  }

  private void versioncheck(string despath)
  {
   try
   {
    #region 查看文件和目录
    if(!despath.endswith(@"/"))
     despath += @"/";

    if(!system.io.directory.exists(despath))
    {
     system.io.directory.createdirectory(despath);
    }

    string temppath = despath + @"tempdespathcache/";

    if(system.io.directory.exists(temppath))
    {
     system.io.directory.delete(temppath,true);
     system.io.directory.createdirectory(temppath);
    }
    else
     system.io.directory.createdirectory(temppath);

    if(!system.io.file.exists(despath + "updateconfig.xml"))
    {
     system.xml.xmldocument updateconfig = new system.xml.xmldocument();
     updateconfig.loadxml(@"<root></root>");
     updateconfig.save(despath + "updateconfig.xml");
    }
    #endregion

   
    system.xml.xmldocument serverxmldoc = updatesvr.appupdatevertion();
    system.xml.xmldocument localxmldoc = new system.xml.xmldocument();
    localxmldoc.load(despath + "updateconfig.xml");
    bool newversionexist = false;
    bool moduleexist = false;
    system.xml.xmlnode servernode0 = serverxmldoc.childnodes[0];
    system.xml.xmlnode localnode0 = localxmldoc.childnodes[0];
    foreach(system.xml.xmlnode servernode in servernode0)
    {
     moduleexist = false;
     foreach(system.xml.xmlnode localnode in localnode0)
     {
      //找到对应模块
      if(localnode.childnodes[0].innertext == servernode.childnodes[0].innertext)
      {
       moduleexist = true;
       //版本号判断
       if(localnode.childnodes[1].innertext.compareto(servernode.childnodes[1].innertext) < 0)
       {
        newversionexist = true;
        if(system.configuration.configurationsettings.appsettings["netstyle"].tostring()=="internet")
        {
         downloadfile(servernode.childnodes[2].innertext,temppath + servernode.childnodes[0].innertext);
        }
        else
        {
         downloadfile(servernode.childnodes[3].innertext,temppath + servernode.childnodes[0].innertext);
        }
       }
       break;
      }
     }
     //没找到对应模块
     if(false == moduleexist)
     {
      
      if(system.configuration.configurationsettings.appsettings["netstyle"].tostring()=="internet")
      {
       downloadfile(servernode.childnodes[2].innertext,temppath + servernode.childnodes[0].innertext);
      }
      else
      {
       downloadfile(servernode.childnodes[3].innertext,temppath + servernode.childnodes[0].innertext);
      }
     }
    }
    //写入新updateconfig.xml升级完毕后替换
    if(newversionexist)
    {
     serverxmldoc.save(temppath + "updateconfig.xml");
     if(dialogresult.yes == messagebox.show("有新版本，是否更新?","提示",messageboxbuttons.yesno))
     {
      string[] dirs = system.io.directory.getfiles(temppath, "*.*");
      string filename;
      foreach (string dir in dirs)
      {
       filename = ((dir.split(convert.tochar(@"/")))[dir.split(convert.tochar(@"/")).length - 1]);
       if(system.io.file.exists(despath + filename))
       {
        //todo:可以支持备份以前版本
        system.io.file.delete(despath + filename);
       }
       //todo:如果系统正在运行，您得停止系统，至于如何停止，也许可以使用system.diagnostics.process
       system.io.file.move(dir,despath + filename);
      }
      messagebox.show("升级完毕");
     }
     else
     {
      //todo:可以支持重新提示升级
     }
    }
   }
   catch(exception ex)
   {
    throw new exception("升级失败，原因是：" + ex.message,ex);
   }
  }

//下载最新的文件

  private void downloadfile(string source,string filename)
  {
   try
   {
    system.net.webclient mywebclient = new system.net.webclient();
    mywebclient.downloadfile(source,filename);
   }
   catch(exception ex)
   {
    throw new exception("下载失败，原因是：" + ex.message,ex);
   }
  }