Question

我在C＃中使用System.IO.Ports.SerialPort类。从我的助手类打开串口时抛出UnAuthorizedAccessException，该助手类位于不同的dll中。如果端口从win表单本身打开，则打开端口是成功的！

_portNames = new List<string>(); 
_portNames.AddRange(SerialPort.GetPortNames()); 
_serialPort = new SerialPort(); 
_serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived); 
_serialPort.ErrorReceived += new SerialErrorReceivedEventHandler(serialPort_ErrorReceived);

var index = 0; 
while (!_serialPort.IsOpen && index < _portNames.Count)
{ 
    try
    { 
        _serialPort.PortName = _portNames[index++]; 
        _serialPort.Open(); 
    } 
    catch (Exception ee) 
    { 
    _logger.Log(ee.Message, EventLogEntryType.Warning); 
    }
}

Answer 1

已在COM1上打开端口

感谢

Answer 2

打开端口时，应始终检查串口是否已打开。可能有另一个应用程序打开了COM端口。

在_serialPort.Open()声明上方试用此代码：

try
{ 
    _serialPort.PortName = _portNames[index++];

    if (_serialPort.IsOpen)
    {
        MessageBox.Show(string.Concat(_serialPort.PortName, " is already opened by another application!"));
    }
    else
    {
        _serialPort.Open();
    }
}

从dll打开端口时UnAuthorizedAccessException串口

2 个答案: