How can I check for sliders on a joystick with SharpDX DirectInput?

Question

I'm working on a multi-joystick setup where I need to build custom button mappings. And even map across devices. For example, if there is a separate joystick and throttle quadrant I need to map 'Z' or whatever, over to the throttle input. I also need to be able to check and see if there is a slider(s) available on each stick as I build the mapping profiles, etc. I cannot figure out how to just say something like: if (joystick.HasSliders)

So far I've tried different variations of

PropertyInfo rxprop = typeof(SharpDX.DirectInput.JoystickState).GetProperty("Sliders");

However, if the joystick does not have sliders, this of course will throw an exception. If it only has a single slider, I will always get back an Int array of Sliders[] with two values, no matter if the stick only has a single slider or not. So it is not a guaranteed way to know if sliders exist, or even how many exist. If there is no second actual slider, the value Sliders[1] is always 0, but if there is a second slider it could still be in the 0 position.

Currently this is what I've been messing with:

usbjoysticks[k].Poll();
JoystickState currentState = null;

try
{
    currentState = usbjoysticks[k].GetCurrentState();

    //joystickmap.axisRangeMax = usbjoysticks[k].GetObjectInfoById(1);
    PropertyInfo rxprop = typeof(SharpDX.DirectInput.JoystickState).GetProperty("Sliders");
    var rzvalue = (int[])rxprop.GetValue(currentState, null);
    var mySlider1 = rzvalue[0];

    var datas = usbjoysticks[k].GetBufferedData();
    foreach (var state in datas)
    {
        Console.WriteLine(state);
        if (state.Offset == JoystickOffset.X)
        {
            Console.WriteLine(state.Value);
        }
    }
    //DeviceObjectInstance my = usbjoysticks[k].GetObjectInfoByName("Sliders1");
    var stuff = usbjoysticks[k].GetObjectPropertiesByName("Sliders0");
    //=================
    joystickmap.jX = "X";
    joystickmap.axisRangeMax = usbjoysticks[k].GetObjectPropertiesByName("Y").Range.Maximum; //65535
    joystickmap.jY = "Y";

    if (currentState.Z != 0)
    {
        joystickmap.jZ = "Z";
        var maxZrange = usbjoysticks[k].GetObjectPropertiesByName("Z").Range.Maximum;
        joystickmap.axisRangeMax = usbjoysticks[k].GetObjectPropertiesByName("Z").Range.Maximum;
    }

    if (currentState.Sliders[0] != 0 || currentState.Sliders[1] != 0) //TODO possible change to Joystick State value in class object instead of text. 
    {
        joystickmap.SLD1 = "Slider1";
        //joystickmap.jZ = "Sliders";
        joystickmap.jsSliders = currentState.Sliders;
        var maxSld1range = usbjoysticks[k].GetObjectPropertiesByName("Sliders0").Range.Maximum; 
        joystickmap.sld1 = joystickmap.jsSliders[0];
        joystickmap.sld2 = joystickmap.jsSliders[1];
    }

    if (currentState.Sliders[1] != 0)
    {
        joystickmap.SLD2 = "Slider2";
    }

    if (currentState.RotationX != 0)
    {
        joystickmap.rX = "RotationX";
    }

    if (currentState.RotationY != 0)
    {
        joystickmap.rY = "RotationY";
    }

    if (currentState.RotationZ != 0)
    {
        joystickmap.rZ = "RotationZ";
        //joystickmap.jZ = "RotationZ";
    }

    joystickmap.axisdivider = 2;

    for (var b = 0; b < 20; b++)
    {
        //joystickmap.joybuttons.Add(currentState.Buttons[b]);
        joystickmap.joybuttons[b] = (b + 1);
    }


    joystickmappings.Add(joystickmap);

    if (!File.Exists(filename))
    {
        File.WriteAllText(filename, JsonConvert.SerializeObject(joystickmap));
        // serialize JSON directly to a file
        using (StreamWriter file = File.CreateText(filename))
        {
            JsonSerializer serializer = new JsonSerializer();
            serializer.Serialize(file, joystickmap);
        }
    }
}
catch (Exception e)
{
    MessageBox.Show("USB joystick map creation failure!\n" + e.Message);
    break;
}