我使用VS2005 开发基于wince 5.0的串口应用程序，在打开串口时使用如下设置：
                m_serialPort.ReadBufferSize = 1024;
                m_serialPort.PortName = "COM3";
                m_serialPort.BaudRate = 57600;
                m_serialPort.Parity =
                m_serialPort.DataBits = 8;
                m_serialPort.StopBits =
                m_serialPort.ReadTimeout = 10;
                m_serialPort.ReceivedBytesThreshold = 1;  //事件触发频率，每收到1个字节长度数据即出发接收事件
                m_serialPort.DataReceived += new SerialDataReceivedEventHandler(m_serialPort_DataReceived);  //绑定接收事件函数
如果从其他设备向此终端模拟发送数据，没隔1秒发送一次，终端每隔5、6秒才收到一串数据。
但是，经过反复尝试，将串口设置改成（多重复几次设定事件处理函数委托）：
              m_serialPort.ReadBufferSize = 1024;
                m_serialPort.PortName = "COM3";
                m_serialPort.BaudRate = 57600;
                m_serialPort.Parity =
                m_serialPort.DataBits = 8;
                m_serialPort.StopBits =
                m_serialPort.ReadTimeout = 10;
                m_serialPort.ReceivedBytesThreshold = 1;  //事件触发频率，每收到1个字节长度数据即出发接收事件
                m_serialPort.DataReceived += new SerialDataReceivedEventHandler(m_serialPort_DataReceived);  //绑定接收事件函数
                m_serialPort.DataReceived += new SerialDataReceivedEventHandler(m_serialPort_DataReceived);  //绑定接收事件函数
                m_serialPort.DataReceived += new SerialDataReceivedEventHandler(m_serialPort_DataReceived);  //绑定接收事件函数
                m_serialPort.DataReceived += new SerialDataReceivedEventHandler(m_serialPort_DataReceived);  //绑定接收事件函数

事件处理函数如下：
public void m_serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
        
            try
            {
                if (m_serialPort.Read(readBuff, m_nReadBytes, 1) == 1)
                {
                    if (readBuff[m_nReadBytes] == 0x02)
                    {
                        m_nReadBytes = 0;
                    }
                    m_nReadBytes++;
                    if (readBuff[m_nReadBytes - 1] == 0x03)
                    {
                        Marshal.Copy(readBuff, 0, hglobal, m_nReadBytes); // System.Runtime.InteropServices.把你的数据从byte[]复制到这段内存空间
   
                        Message msg = Message.Create(m_msgWnd.Hwnd, MsgWindow.WM_RECVDATA, hglobal, (IntPtr)m_nReadBytes);
                        MessageWindow.PostMessage (ref msg);
                        m_nReadBytes = 0;
                    }
                }
            }
            catch (Exception ee)        
            {
                //如果读取超时，可能会出发此异常
            }  
        }
串口接收就正常了。小弟刚开始接触C#，请高手指点一下，这是什么原因？


[ 本帖最后由 wzg_soullon 于 2010-1-9 12:46 编辑 ]

你好，可以MSN上聊吗？
pc_155#
我也遇到和你一样的问题。

从网上搜索，好像是serialport存在bug，也不知是真是假，反正就是不能正常接收。后来直接开一个线程，专门辅助数据读取就可以了。