Program.cs

using System;
using System.Linq;
using System.Windows.Forms;
using Linearstar.Windows.RawInput;
using RawInput.Sharp.SimpleExample;

// Get the devices that can be handled with Raw Input.
var devices = RawInputDevice.GetDevices();

// Keyboards will be returned as a RawInputKeyboard.
var keyboards = devices.OfType<RawInputKeyboard>();

// List them up.
foreach (var device in keyboards)
    Console.WriteLine(
        $"{device.DeviceType} {device.VendorId:X4}:{device.ProductId:X4} {device.ProductName}, {device.ManufacturerName}");

// To begin catching inputs, first make a window that listens WM_INPUT.
var window = new RawInputReceiverWindow();

window.Input += (sender, e) =>
{
    // Catch your input here!
    var data = e.Data;

    Console.WriteLine(data);
};

try
{
    // Register the HidUsageAndPage to watch any device.
    RawInputDevice.RegisterDevice(HidUsageAndPage.Keyboard,
        RawInputDeviceFlags.ExInputSink | RawInputDeviceFlags.NoLegacy, window.Handle);
    RawInputDevice.RegisterDevice(HidUsageAndPage.Mouse,
        RawInputDeviceFlags.ExInputSink | RawInputDeviceFlags.NoLegacy, window.Handle);
    
    Application.Run();
}
finally
{
    RawInputDevice.UnregisterDevice(HidUsageAndPage.Keyboard);
}