C# 获取USB状态

判断某个设备是否已连接：

        private bool CheckLaserPenDeviceConnected(sting vid,string pid)
        {
            var devices = GetUsbDevices();
            var penGuid = $"VID_{vid}&PID_{pid}";
            foreach (var device in devices)
            {
                var pnpDeviceId = device.PNPDeviceID;
                if (pnpDeviceId.ToLower().Contains(penGuid.ToLower()))
                {
                    return true;
                }
            }
            return false;
        }

 获取所有USB列表

        /// <summary>
        /// 获取所有USB设备信息
        /// </summary>
        /// <returns></returns>
        private static List<(string DeviceID, string PNPDeviceID, string Description)> GetUsbDevices()
        {
            List<(string DeviceID, string PNPDeviceID, string Description)> devices = new List<(string, string, string)>();
            using (var searcher = new ManagementObjectSearcher(@"Select * From Win32_USBHub"))
            {
                using (var collection = searcher.Get())
                {
                    foreach (var device in collection)
                    {
                        devices.Add(((string) device.GetPropertyValue("DeviceID"),
                            (string) device.GetPropertyValue("PNPDeviceID"),
                            (string) device.GetPropertyValue("Description")));
                    }
                }
            }

            return devices;
        }