private void RealTimeFaceDetect_Load(object sender, EventArgs e)
 {
     detector    = new HaarObjectDetector(cascade, 30);
     _cameraList = CameraAssistance.Enumerate();
     foreach (var item in _cameraList)
     {
         this.CamerasCbx.Items.Add(item);
     }
 }
 private void OpenOrCloseCam_Click(object sender, EventArgs e)
 {
     if (isOpen == false)
     {
         this.videoSourcePlayer1.VideoSource = CameraAssistance.CameraConn(_videoDevices, this.CamerasCbx.SelectedIndex);
         this.videoSourcePlayer1.Start();
         isOpen = true;
         this.videoSourcePlayer1.BringToFront();
         OpenOrCloseCam.Text = "关闭摄像头";
     }
     else
     {
         this.videoSourcePlayer1.SignalToStop();
         this.videoSourcePlayer1.WaitForStop();
         isOpen = false;
         OpenOrCloseCam.Text = "打开摄像头";
     }
 }