之前从网上当到的，从注册表里面获取

C#获取串口列表      //using Microsoft.Win32;        public void GetComList()        {            RegistryKey keyCom = Registry.LocalMachine.OpenSubKey("Hardware\\DeviceMap\\SerialComm");            if (keyCom != null)            {                string[] sSubKeys = keyCom.GetValueNames();                this.cmbComPort.Items.Clear();                foreach (string sName in sSubKeys)                {                    string sValue = (string)keyCom.GetValue(sName);                    this.cmbComPort.Items.Add(sValue);                }            }        }