C#获取所有串口号

   Dictionary<int, string> dicCOM = new Dictionary<int, string>();            for (int i = 1; i <= 30; i++)            {                //声明串口号                string ComName = "COM" + i.ToString();                try                {                    SerialPort spcom = new SerialPort();                    spcom.PortName = ComName;                    if (!spcom.IsOpen)                    {                        spcom.Open();                        spcom.Close();                    }                    dicCOM.Add(i, "COM" + i.ToString());                }                catch                {                    continue;                }            }