qq_28650089的博客

1.查询所有串口名称 String[] Portname = SerialPort.GetPortNames(); 2.通过串口名（serial_name）查看串口是否被占用 int TestSerial(String serial_name) { try { using (SafeFileHandle hComm = CreateFile("\\\\.\\" + serial_name, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_RE

c#查询网口的状态（up、down） foreach (var item in NetworkInterface.GetAllNetworkInterfaces()) { // 以太网接口 if (item.NetworkInterfaceType == NetworkInterfaceType.Ethernet) { if (item.OperationalStatus == OperationalStatus.Up) {