Winform 下载服务器安装包并安装

 代码中包含了检测本地安装盘符代码

一，定义下载委托事件(用于实现前台进度条更新和下载完成后事件的回调)：
private delegate void Action();
private string diverUrl = ConfigurationManager.AppSettings["diverUrl"];//http:形式
//页面初次加载事件
private void frmProgressBar_Load(object sender, EventArgs e)
        {
            //获取存储路径
            GetRemovableDeviceId();
            if (File.Exists(_drivesName))
            {
                //安装包存在，则直接进行安装
                var process = Process.Start(_drivesName);
                if (process != null) process.WaitForExit();
                //Process
                this.Close();
            }
            else
            {
                //安装包不存在--则下载
                DownloadFile(diverUrl, _drivesName,DownloadProgressChanged, downloadFileCompleted);
            }
        }

        /// 下载
        private void downloadFileCompleted()
        {
            Process.Start(_drivesName);
            this.Close();
        }

        /// 检测本机盘符
        public void GetRemovableDeviceId()
        {
            List<string> drivesList = new List<string>();
            DriveInfo[] dr = DriveInfo.GetDrives();
            foreach (DriveInfo dd in dr)
            {
                if (dd.DriveType == DriveType.CDRom || dd.DriveType == DriveType.Removable)  //过滤掉是光驱的 磁盘或移动U盘
                {
                    break;
                }
                else
                {
                    drivesList.Add(dd.Name);
                }
            }
            //已驱除驱动盘
            for (int i = 0; i < drivesList.Count; i++)
            {
                //其它盘符
                if (drivesList[i].IndexOf("C") == -1)
                {
                    _drivesName = drivesList[drivesList.Count - 1].Replace(":\\", "")+ ":Cam_Ocx.exe";
                    return;
                }
                else
                {
                    _drivesName = drivesList[i].Replace(":\\","") + ":Cam_Ocx.exe";
                }
            }
        }
//下载文件
 private void DownloadFile(string url, string savefile, Action<int> downloadProgressChanged, Action downloadFileCompleted)
        {
            WebClient client = new WebClient();
            if (downloadProgressChanged != null)
            {
                client.DownloadProgressChanged += delegate (object sender, DownloadProgressChangedEventArgs e)
                {
                    this.Invoke(downloadProgressChanged, e.ProgressPercentage);
                };
            }
            if (downloadFileCompleted != null)
            {
                client.DownloadFileCompleted += delegate (object sender, AsyncCompletedEventArgs e)
                {
                    this.Invoke(downloadFileCompleted);
                };
            }
            client.DownloadFileAsync(new Uri(url), savefile);
        }
//显示进度条
 private void DownloadProgressChanged(int val)
        {
            progressBar1.Value = val;
            lbValue.Text = val + "%";
        }