C# 为什么在关闭COM端口后获取数据?
我有从打开COM端口接收数据的方法:C# 为什么在关闭COM端口后获取数据?,c#,c#-4.0,port,C#,C# 4.0,Port,我有从打开COM端口接收数据的方法: private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e) { SerialPort sp = (SerialPort)sender; try { if (sp.IsOpen) {
private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
try
{
if (sp.IsOpen)
{
if (sp.BytesToRead > 0)
{
// Get data
}
}
}
}
private void connectPort()
{
SerialPort mySerialPort = new SerialPort(port);
...
}
我还有一个方法,可以连接到COM端口:
private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
try
{
if (sp.IsOpen)
{
if (sp.BytesToRead > 0)
{
// Get data
}
}
}
}
private void connectPort()
{
SerialPort mySerialPort = new SerialPort(port);
...
}
调用关闭端口的方法时:
mySerialPort.DiscardInBuffer();
mySerialPort.DiscardOutBuffer();
mySerialPort.Close();
在我从设备上获取数据之后。出了什么问题?我不确定,但从这个角度看,从另一个线程引发的数据可能正在缓冲和/或滞后于实际数据(另外,您有可能在丢弃缓冲区和关闭缓冲区之间接收数据) 我可能会先解开DataReceivedHandler,然后关闭连接,最后丢弃数据,例如
mySerialPort.DataReceived -= new SerialDataReceivedEventHandler(DataReceivedHandler);