问如何防止专用键盘输入到TextBox中

EN

private SharpLib.Hid.Handler iHidHandler;
    
    private void Window1_Loaded(object sender, RoutedEventArgs e)
    {
        HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
        source.AddHook(WndProc);

        RAWINPUTDEVICE[] rid = new RAWINPUTDEVICE[1];
        rid[0].usUsagePage = 0x01;

        rid[0].usUsage = 0x06;

        rid[0].dwFlags = RawInputDeviceFlags.RIDEV_INPUTSINK | RawInputDeviceFlags.RIDEV_NOLEGACY;

        rid[0].hwndTarget = source.Handle;

        iHidHandler = new SharpLib.Hid.Handler(rid);

        iHidHandler.OnHidEvent += HandleHidEventThreadSafe;
    }

    public void HandleHidEventThreadSafe(object aSender, SharpLib.Hid.Event aHidEvent)
    {
        if (aHidEvent.IsStray)
        {
            //Stray event just ignore it
            return;
        }
        else
        {
            // do something...
            if (aHidEvent.Device.ProductId == xxx && aHidEvent.Device.VendorId == xxx)
            {
                Debug.WriteLine(aHidEvent.VirtualKey.ToString());
            }
        }
    }

    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        Message message = Message.Create(hwnd, msg, wParam, lParam);

        switch (msg)
        {
            case Const.WM_INPUT:

                iHidHandler.ProcessInput(ref message);
                handled = true;
                break;
        }

        return IntPtr.Zero;
    }