调用另一个线程C#中的函数

我不知道该怎么说，但我会尽力的。

我有一个Windows窗体应用程序，它使用网络摄像头为用户拍照，效果很好，我使用的是这里的directshownet库http://directshownet.sourceforge.net/并使用DxSnap样本拍摄了这张照片。

应用程序的下一部分使用RFID标签读取器，一旦扫描标签，它就会调用拍照方法。这就是问题的症结所在，因为RFID侦听方法是在GUI线程的单独线程中运行的，因为它是一个无限while循环。

用于获取图片的类将picturebox控件的一个实例作为其构造函数的参数，该构造函数是在主线程中创建的，我认为这就是问题所在

应用程序的每个部分都可以单独工作，但当我试图调用该方法从侦听器线程拍摄照片时，所有的地狱都会崩溃，应用程序也会崩溃。

有人知道我如何从监听器线程调用在主线程（拍摄照片）中初始化的对象的方法吗？

我尝试过委托和调用，但无法解决，因为我不想直接操作控件，而是让对象在主线程中执行。

这里有一些代码：

    private Capture cam;
    private int portIndex = -1;
    private ArrayList AlreadyOpenPortList = new ArrayList();
    private byte readerAddr = 0;
    private Thread listenThread;
    IntPtr m_ip = IntPtr.Zero;
    public podiumForm()
    {
        InitializeComponent();
        // scanner and camera startup
        startCam();
        openComs();
        openRF();
        startListening();
    }

 private void startListening()
    {
        listenThread = new Thread(new ThreadStart(this.Listen));
        listenThread.Start();
    }
    /// <summary>
    /// Method of retrieving code tag details from reader
    /// </summary>
    private void Listen()        
    {
        int fCmdRet = 0x30;
        byte state = 1;
        byte AFI = 00;
        byte[] DSFIDAndUID = new byte[9];
        byte cardNumber = 0;
        string strDSFIDAndUID = "";
        byte outputSet;
        if (!GetCurrentUsePort())
        {
            MessageBox.Show("Open ComPort, Please");
            return;
        }

        while (true)
        {
            fCmdRet = StaticClassReaderA.Inventory(ref readerAddr, ref state, ref AFI, DSFIDAndUID, ref cardNumber, portIndex);
            if (fCmdRet == 0)
            {
                outputSet = 0;
                fCmdRet = StaticClassReaderA.SetGeneralOutput(ref readerAddr, ref outputSet, portIndex);
                strDSFIDAndUID = ByteArrayToHexString(DSFIDAndUID).Replace(" ", "");
                outputSet = 3;
                fCmdRet = StaticClassReaderA.SetGeneralOutput(ref readerAddr, ref outputSet, portIndex);
                SavePic(strDSFIDAndUID.Substring(2, 16));
                //MessageBox.Show(strDSFIDAndUID.Substring(2, 16));
                //ShutDown();
            }
        }
    }
private void SavePic(string text)
    {
        Cursor.Current = Cursors.WaitCursor;
        // Release any previous buffer
        if (m_ip != IntPtr.Zero)
        {
            Marshal.FreeCoTaskMem(m_ip);
            m_ip = IntPtr.Zero;
        }
        // here's where it crashes
        // capture image
        m_ip = cam.Click();
        Bitmap b = new Bitmap(cam.Width, cam.Height, cam.Stride, PixelFormat.Format24bppRgb, m_ip);
        cam.Dispose();
        // If the image is upsidedown
        b.RotateFlip(RotateFlipType.RotateNoneFlipY);
        pbPic.Image = b;
        Cursor.Current = Cursors.Default;
        MessageBox.Show("Here " + text);
    }

private void startCam()
    {
        const int VIDEODEVICE = 0; // zero based index of video capture device to use
        const int VIDEOWIDTH = 640; // Depends on video device caps
        const int VIDEOHEIGHT = 480; // Depends on video device caps
        const int VIDEOBITSPERPIXEL = 24; // BitsPerPixel values determined by device
        cam = new Capture(VIDEODEVICE, VIDEOWIDTH, VIDEOHEIGHT, VIDEOBITSPERPIXEL, pbPic);
    }

// method in capture class
 public IntPtr Click()
    {
        int hr;
        // get ready to wait for new image
        m_PictureReady.Reset();
        m_ipBuffer = Marshal.AllocCoTaskMem(Math.Abs(m_stride) * m_videoHeight);
        try
        {
            m_WantOne = true;
            // If we are using a still pin, ask for a picture
            if (m_VidControl != null)
            {
                // CRASHES HERE with : System.InvalidCastException was unhandled
                // Tell the camera to send an image
                hr = m_VidControl.SetMode(m_pinStill, VideoControlFlags.Trigger);
                DsError.ThrowExceptionForHR(hr);
            }
            // Start waiting
            if (!m_PictureReady.WaitOne(9000, false))
            {
                throw new Exception("Timeout waiting to get picture");
            }
        }
        catch
        {
            Marshal.FreeCoTaskMem(m_ipBuffer);
            m_ipBuffer = IntPtr.Zero;
            throw;
        }
        // Got one
        return m_ipBuffer;
    }

 Image image = (Image)pictureBox.Invoke ((Func<Image>) delegate { return pictureBox.Image; });