sp_DataReceived函数是当接收缓冲区有元素时触发，本人使用串口自发自收，接收到图片后界面卡死。使用断点追踪运行过程发现在 sp_DataReceived函数触发运行一次后，又自动运行第二次，在读取函数 sp.Read(Recieve_bytes, 0, Recieve_bytes.Length)处卡死。尝试发送本人定义的数组时不会出现该问题，只有发送被转为byte[ ]的image时才会这样。发送和接收缓冲区使用后均已丢弃。下面是串口定义，图片发送和接收的部分源码，希望高手帮看看，分析一下原因。
这是串口设置：

private void SetPortProperty()//设置串口的属性
        {
            sp = new SerialPort();
            sp.PortName = Serial_Number.Text.Trim();//设置串口名
            sp.BaudRate = Convert.ToInt32(Baud_Rate.Text.Trim());//设置波特率，将字符型转换为整型
            sp.StopBits = StopBits.One;//设置停止位为1
            sp.DataBits = 8;//设置数据位为8位
            sp.Parity = Parity.None;//设置为无奇偶校验位
            sp.ReadTimeout = -1;//设置超时读取时间
            sp.RtsEnable = false;//启用请求发送(RTS)信号
            //定义DataReceived事件，当串口收到数据后触发事件
            sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
            sp.Encoding = System.Text.Encoding.GetEncoding("GB2312");
            //sp.ReceivedBytesThreshold = 7000;
            sp.WriteBufferSize = 10000;
            sp.ReadBufferSize = 10000;
        }

这是保存摄像头采集的图片，并打开再发送：

private void Take_photo_Click(object sender, EventArgs e)
        {     
            try
            {
                if (videoSourcePlayer1.IsRunning)
                {
                    //Bitmap source = videoSourcePlayer1.GetCurrentVideoFrame();
                    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                                 videoSourcePlayer1.GetCurrentVideoFrame().GetHbitmap(),
                                 IntPtr.Zero,
                                 Int32Rect.Empty,
                                 BitmapSizeOptions.FromEmptyOptions());
                    JpegBitmapEncoder pE = new JpegBitmapEncoder();
                    pE.Frames.Add(BitmapFrame.Create(bitmapSource));
                    string picName = GetImagePath() + "\" + "photo" + ".jpeg";
                    while (File.Exists(picName))
                    {
                        File.Delete(picName);
                    }
                    using (Stream stream = File.Create(picName))
                    {
                        pE.Save(stream);
                    }
                    System.Drawing.Image image = System.Drawing.Image.FromFile(picName);
                    MemoryStream ms = new MemoryStream();
                    image.Save(ms, ImageFormat.Jpeg);
                    ms.Flush();
                    ms.Seek(0, SeekOrigin.Begin);
                    byte[] Source_bytes = new byte[ms.Length];
                    data_lenth = Source_bytes.Length;
                    ms.Read(Source_bytes, 0, (int)ms.Length);//这里已经转成了字节
                    ms.Close();
                    ms.Dispose();
                    image.Dispose();//！占用的系统资源使用后一定要释放！            
                    if (isOpen)
                    {
                        sp.Write(Source_bytes,0, Source_bytes.Length);
                        sp.DiscardOutBuffer();                               
                    }
                    else
                    {
                        MessageBox.Show("串口未打开！", "错误提示");
                        return;
                    }            
                }
                else
                {
                    MessageBox.Show("摄像头未打开！");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("摄像头异常：" + ex.Message);
            }
        }

这是串口接收：

 private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            System.Threading.Thread.Sleep(1000);//延时10ms等待接收完数据
            //this.Invoke就是跨线程访问ui的方法，也是本文的范例
            this.Invoke((EventHandler)(delegate
            {
                //The_Recive_Data.Text += sp.ReadLine();
                byte[] Recieve_bytes = new byte[data_lenth];
                sp.Read(Recieve_bytes, 0, Recieve_bytes.Length);
                MemoryStream ms = new MemoryStream(Recieve_bytes);
                try
                {
                    System.Drawing.Image recieveImage = System.Drawing.Image.FromStream(ms);
                    ms.Flush();
                    ms.Close();
                    pictureBox1.Image = recieveImage;
                    //recieveImage.Dispose();
                }
                catch (ArgumentException)
                {
                    MessageBox.Show("数据流为空！");
                }
                sp.DiscardInBuffer();//丢弃接收缓冲区数据
            }));
        }

public delegate void myDel();
protected void myMethod() //模拟接收
{
    //接收图片的代码    
}
protected void Completed(IAsyncResult Iasy) //回调函数，当接收完图片后，次线程会主动调用
{
    //告诉主线程，图片接收完了
}
//主线程调用
myDel d = new myDel(myMethod);
d.BeginInvoke(new AsyncCallback(Completed), null); //异步调用
//Thread.Sleep(1000);