为什么我的BackgroundWork不起作用?

        private void button2_Click(object sender, EventArgs e)

        {

            //安装APK

            this.backgroundWorker1.RunWorkerAsync();

        }



        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

        {

            //安装APK

            //this.backgroundWorker1.RunWorkerAsync();

            System.Diagnostics.Process InstallApk = new System.Diagnostics.Process();

            InstallApk.StartInfo.FileName = Application.StartupPath + @"\tools\adb.exe";

            InstallApk.StartInfo.UseShellExecute = false;

            InstallApk.StartInfo.RedirectStandardInput = true;

            InstallApk.StartInfo.RedirectStandardOutput = true;

            InstallApk.StartInfo.RedirectStandardError = false;

            InstallApk.StartInfo.CreateNoWindow = true;

            System.IO.DirectoryInfo ApkFolder = new System.IO.DirectoryInfo(Application.StartupPath + @"\apk");

            foreach (System.IO.FileInfo ApkFile in ApkFolder.GetFiles("*.apk", System.IO.SearchOption.AllDirectories))

            {

                InstallApk.StartInfo.Arguments = "install -r " + @"apk\" + ApkFile.Name;

                InstallApk.Start();

                InstallApk.WaitForExit();

                //通过这个函数将处理的百分比传递给进度条控件

                //this.backgroundWorker1.ReportProgress();

                label1.Text += ApkFile.Name + "安装完成!\n";

                label1.Update();

                InstallApk.Close();

            }

            //执行



        }