private void OnUsbDeviceAddedOrRemoved()

in ScpDriverInstaller/MainWindow.xaml.cs [102:205]
88 lines of code
17 McCabe index (conditional complexity)

        private void OnUsbDeviceAddedOrRemoved()
        {
            var usbDevices = WdiWrapper.Instance.UsbDeviceList.ToList();
            var supportedBluetoothDevices = IniConfig.Instance.BthDongleDriver.HardwareIds;
            var regex = new Regex("VID_([0-9A-Z]{4})&PID_([0-9A-Z]{4})", RegexOptions.IgnoreCase);

            // HidUsb devices
            {
                DualShockStackPanelHidUsb.Children.Clear();
                _viewModel.InstallDs3ButtonEnabled = false;

                foreach (
                    var usbDevice in
                        usbDevices.Where(
                            d => d.VendorId == _hidUsbDs3.VendorId
                                 && (d.ProductId == _hidUsbDs3.ProductId || d.ProductId == _hidUsbDs4.ProductId)
                                 && !string.IsNullOrEmpty(d.CurrentDriver)
                                 && d.CurrentDriver.Equals("HidUsb"))
                    )
                {
                    DualShockStackPanelHidUsb.Children.Add(new TextBlock
                    {
                        Text = string.Format("Device #{0}: {1}", DualShockStackPanelHidUsb.Children.Count, usbDevice),
                        Tag = usbDevice,
                        VerticalAlignment = VerticalAlignment.Center,
                        Margin = new Thickness(10, 0, 0, 10)
                    });

                    _viewModel.InstallDs3ButtonEnabled = true;
                }
            }

            // WinUsb devices
            {
                DualShockStackPanelWinUsb.Children.Clear();

                foreach (
                    var usbDevice in
                        usbDevices.Where(
                            d => d.VendorId == _hidUsbDs3.VendorId
                                 && (d.ProductId == _hidUsbDs3.ProductId || d.ProductId == _hidUsbDs4.ProductId)
                                 && !string.IsNullOrEmpty(d.CurrentDriver)
                                 && d.CurrentDriver.Equals("WinUSB"))
                    )
                {
                    DualShockStackPanelWinUsb.Children.Add(new TextBlock
                    {
                        Text = string.Format("Device #{0}: {1}", DualShockStackPanelWinUsb.Children.Count, usbDevice),
                        Tag = usbDevice,
                        VerticalAlignment = VerticalAlignment.Center,
                        Margin = new Thickness(10, 0, 0, 10)
                    });
                }
            }

            // refresh devices filtering on supported Bluetooth hardware IDs and BTHUSB driver (uninitialized)
            {
                var uninitialized =
                    usbDevices.Where(
                        d =>
                            !string.IsNullOrEmpty(d.CurrentDriver) &&
                            d.CurrentDriver.Equals("BTHUSB") &&
                            supportedBluetoothDevices.Any(s => s.Contains(regex.Match(d.HardwareId).Value)));

                BluetoothStackPanelDefault.Children.Clear();
                _viewModel.InstallBthButtonEnabled = false;

                foreach (var usbDevice in uninitialized)
                {
                    BluetoothStackPanelDefault.Children.Add(new TextBlock
                    {
                        Text = string.Format("Device #{0}: {1}", BluetoothStackPanelDefault.Children.Count, usbDevice),
                        Tag = usbDevice,
                        VerticalAlignment = VerticalAlignment.Center,
                        Margin = new Thickness(10, 0, 0, 10)
                    });

                    _viewModel.InstallBthButtonEnabled = true;
                }
            }

            // refresh devices filtering on supported Bluetooth hardware IDs and WinUSB driver (initialized)
            {
                var initialized =
                    usbDevices.Where(
                        d =>
                            !string.IsNullOrEmpty(d.CurrentDriver) &&
                            d.CurrentDriver.Equals("WinUSB") &&
                            supportedBluetoothDevices.Any(s => s.Contains(regex.Match(d.HardwareId).Value)));

                BluetoothStackPanelWinUsb.Children.Clear();

                foreach (var usbDevice in initialized)
                {
                    BluetoothStackPanelWinUsb.Children.Add(new TextBlock
                    {
                        Text = string.Format("Device #{0}: {1}", BluetoothStackPanelWinUsb.Children.Count, usbDevice),
                        Tag = usbDevice,
                        VerticalAlignment = VerticalAlignment.Center,
                        Margin = new Thickness(10, 0, 0, 10)
                    });
                }
            }
        }