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我有以下代碼SerialPort.Read不扔TimeoutException異常
private SerialPort _port = null;
public SerialReader(string portname, int baudrate, Parity parity, int databits, StopBits stopbits, int readTimeoutMs = 10000)
{
//Set serial-port
_port = new SerialPort();
_port.PortName = portname;
_port.BaudRate = baudrate;
_port.Parity = parity;
_port.DataBits = databits;
_port.StopBits = stopbits;
_port.ReadTimeout = readTimeoutMs;
_port.DataReceived += new SerialDataReceivedEventHandler(SerialPort_DataReceivedNew);
_port.Open();
}
private void SerialPort_DataReceivedNew(object sender, SerialDataReceivedEventArgs e)
{
SerialPort port = (SerialPort)sender;
_buffer = new byte[port.BytesToRead];
try
{
port.Read(_buffer, 0, _buffer.Length);
}
catch (System.TimeoutException ex)
{
bool doDispose = true;
if (ReadTimeout != null)
ReadTimeout(ex, out doDispose);
if(doDispose)
this.Dispose();
return;
}
///////////
}
如果連接的設備發送數據的所有工作正常,但如果我拔掉它,程序等待其他數據永遠不會引發System.TimeoutException
(documentation說它應該拋出異常)。
我通過在bool doDispose = true;
上放置一個斷點來驗證這一點,它從來沒有達到過。
程序集編譯爲「調試」。
這是一個錯誤還是我錯過了什麼?
編輯
這可能是SerialPort_DataReceivedNew不叫,因爲沒有數據實際收到,如果是這樣的話,我怎麼能發現錯誤?
編輯2
爲了使它工作,我編輯過這樣的代碼:
添加的方法BeginGetData和PollSerialPort
public void BeginGetData()
{
_port.Open();
Thread pollingThread = new System.Threading.Thread(new System.Threading.ThreadStart(PollSerialPort));
pollingThread.Start();
}
private void PollSerialPort()
{
while (this.SerialPort_DataReceivedNew()) ;
}
和編輯SerialPort_DataReceivedNew
private bool SerialPort_DataReceivedNew()
{
_buffer = new byte[_port.BytesToRead];
try
{
if (_port.Read(_buffer, 0, _buffer.Length) == 0)
_port.Write("\0");
}
catch (System.TimeoutException ex)
{
bool doDispose = true;
if (ReadTimeout != null)
ReadTimeout (this, out doDispose);
if (doDispose)
{
_port.Close();
return false;
}
return true;
}
///////////
}
在_port.Write("\0");
我有TimeoutException
也許閱讀返回一些值? 0? –
http://stackoverflow.com/questions/13408476/detecting-when-a-serialport-gets-disconnected –