Microsoft.Xna.Framework.OpenTKGameWindow.Keyboard_KeyDown C# (CSharp) Method

        private void Keyboard_KeyDown(object sender, OpenTK.Input.KeyboardKeyEventArgs e)
        {
            if (_allowAltF4 && e.Key == OpenTK.Input.Key.F4 && keys.Contains(Keys.LeftAlt))
            {
                window.Close();
                return;
            }
            Keys xnaKey = KeyboardUtil.ToXna(e.Key);
            if (!keys.Contains(xnaKey)) keys.Add(xnaKey);
        }