C#自动升级程序：WebClient下载+progressBar进度条

        //全局变量定义
        WebClient client = new WebClient(); //使用WebClient下载
        int downfilenum = 0; int downlistnum = 0;
        ArrayList downlist = new ArrayList();

        private void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        { //下载过程中
            int a = e.ProgressPercentage;
            progressBar1.Value = a;
            label1.Text = a + "% Downloading... ";
        }
        private void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        { //下载完成时
            downfilenum++;
            if (client != null) { client.CancelAsync(); }
            if (downfilenum < downlistnum) DownLoadFile(downlist[downfilenum].ToString()); //下载剩余的
            if (downfilenum == downlistnum) { init2(); } //继续初始化
        }

        //获取本地的版本信息
        private string GetTheLastUpdateTime(string Dir)
        {省略}

        //获取临时文件里的下载文件地址
        private ArrayList GetDownFileList(string Dir)
        {省略}

        //HTTP下载远程文件并保存本地的函数
        private void DownLoad(string downAddress, string savePath, Boolean Async)
        {
            DirectoryInfo di = Directory.GetParent(savePath); 
            if (!di.Exists)  di.Create();

            WebClient client = new WebClient();  //再次new 避免WebClient不能I/O并发          
            if (Async)
            { //异步下载
                client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
                client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
                client.DownloadFileAsync(new Uri(downAddress), savePath); 
            }
            else client.DownloadFile(new Uri(downAddress), savePath);
        }

        //下载某个文件
        private void DownLoadFile(string url)
        {
            string curdir = Application.StartupPath;
            string[] arr = url.Split('/');
            string filename = arr[arr.Count() - 1];
            label2.Text = filename;
            DownLoad(url, curdir + @"\temp\" + filename, true); //异步下载远程文件
        }

        //初始化
        private void init()
        {
            string curdir = Application.StartupPath;
            DownLoad("http://www.piaoyi.org/tool/ppproxy/Update.xml", curdir + @"\temp\Update.xml", false); //非异步下载远程文件  
            string thePreUpdateDate = GetTheLastUpdateTime(curdir); //本地版本信息
            string theLastsUpdateDate = GetTheLastUpdateTime(curdir + @"\temp\"); //远程下载本地后的版本信息
            if (thePreUpdateDate == "") thePreUpdateDate = "1990-10-10";

            //比较应用程序的更新日期 
            if (Convert.ToDateTime(thePreUpdateDate) >= Convert.ToDateTime(theLastsUpdateDate))
            {
                MessageBox.Show("当前软件已经是最新的，欢迎使用！", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                if (Directory.Exists(curdir + @"\temp\")) Directory.Delete(curdir + @"\temp\", true); //删除临时目录
                this.Close();
            }
            else
            {
                MessageBox.Show("发现新版本，软件即将自动升级...", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

                //关闭原有应用程序的所有进程 
                System.Diagnostics.Process[] proc = System.Diagnostics.Process.GetProcessesByName("PpProxy");
                foreach (System.Diagnostics.Process pro in proc)
                {
                    pro.Kill();
                }

                downlist = GetDownFileList(curdir + @"\temp"); //获取需要下载的文件列表
                downlistnum = downlist.Count;
                if (downlistnum > 0) DownLoadFile(downlist[0].ToString()); //异步下载第一个
            }
        }

        private void init2()
        {
            string curdir = Application.StartupPath;
            DirectoryInfo theFolder = new DirectoryInfo(curdir + @"\temp");
            if (theFolder.Exists)
            {
                foreach (FileInfo theFile in theFolder.GetFiles())
                {
                    //如果临时文件夹下存在与应用程序所在目录下的文件同名的文件，则删除应用程序目录下的文件   
                    if (File.Exists(curdir + "\\" + Path.GetFileName(theFile.FullName)))
                        File.Delete(curdir + "\\" + Path.GetFileName(theFile.FullName));
                    //将临时文件夹的文件移到应用程序所在的目录下   
                    File.Move(theFile.FullName, curdir + "\\" + Path.GetFileName(theFile.FullName));
                }
            }

            if (Directory.Exists(curdir + @"\temp\")) Directory.Delete(curdir + @"\temp\", true); //删除临时目录

            //启动安装程序  
            this.label1.Text = "正在启动程序....";
            System.Diagnostics.Process.Start(curdir + @"\PpProxy.exe");
            this.Close();
        }

        //
        private void Form1_Load(object sender, EventArgs e)
        {
            init();  //初始化
        }

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