Глобальные горячие клавиши

Пишу для себя програмку для упрощения работы. Суть програмы - запуститься, свернуться в трей и слушать клавиатуру на предмет комбинации клавиш

И вот вылез баг: нужно чтоб при нажатии комбинации клавиш остальная система игнорировала её например: нажал я ctrl+n, программа отработала, но система реагирует на нажатие n, вводя её в, например, строку браузера, или открывая новое окно

e.handled = true - не помогло, так как блочит любое нажатие ctrl или n

пробую e.handled по условию - вообще магия - ctrl изменяет поведение, а вот n продолжает работать опыты показали, что, похоже, моя программа далеко не первая в очереди обработчиков нажатия n

Честно говоря, я затрудняюсь объяснить, как именно себя ведёт алгоритм, так как тестировал миллион вариантов расположения e.handled = true и уже запутался, но вот для примера:

e.handled = true, расположенный без условий в самом начале обработчика отлично выключает ctrl и n по всей системе

e.handled = true при условии нажатия именно n и всех предыдущих клавиш попросту не работает, как вот здесь:

 private void gkh_KeyDown(object sender, KeyEventArgs e)
        {
            //e.Handled = true;
            if (_combinaison.IndexOf(e.KeyCode) == _combinaison.Count - 1)
            {
                bool before_pressed = true;
                for (int i = 0; i < _combinaison.IndexOf(e.KeyCode); i++)
                {
                    if (_pressed[i] == false)
                    {
                        before_pressed = false;
                    }
                }

                if (before_pressed == true)
                {
                    e.Handled = true;
                    _f(_combinaison);
                }
            }
            else
            {
                _pressed[_combinaison.IndexOf(e.KeyCode)] = true;
            }

        }

Вот мой код:

class Combinaison
    {
        public delegate void EventFunction(List<Keys> keys);

        private globalKeyboardHook _gkh = new globalKeyboardHook();
        private EventFunction _f;
        private List<Keys> _combinaison;
        private List<bool> _pressed = new List<bool>();


        public Combinaison(List<Keys> combinaison, EventFunction f)
        {
            _f = f;
            _combinaison = combinaison;
            foreach (Keys k in _combinaison)
            {
                _gkh.HookedKeys.Add(k);
                _pressed.Add(false);
            }
            _gkh.KeyDown += new KeyEventHandler(gkh_KeyDown);
            _gkh.KeyUp += new KeyEventHandler(gkh_KeyUp);
        }

        private void gkh_KeyUp(object sender, KeyEventArgs e)
        {


            if (_combinaison.IndexOf(e.KeyCode) == _combinaison.Count - 1)
            {
                e.Handled = true;
            }


            _pressed[_combinaison.IndexOf(e.KeyCode)] = false;
        }

        private void gkh_KeyDown(object sender, KeyEventArgs e)
        {

            if (_combinaison.IndexOf(e.KeyCode) == _combinaison.Count - 1)
            {

                bool before_pressed = true;
                for (int i = 0; i < _combinaison.IndexOf(e.KeyCode); i++)
                {
                    if (_pressed[i] == false)
                    {
                        before_pressed = false;
                    }
                }


                if (before_pressed == true)
                {
                    _f(_combinaison);

                }
            }
            else
            {
                _pressed[_combinaison.IndexOf(e.KeyCode)] = true;
            }

        }
    } 

    class globalKeyboardHook
    {
        #region Constant, Structure and Delegate Definitions
        /// <summary>
        /// defines the callback type for the hook
        /// </summary>
        public delegate int keyboardHookProc(int code, int wParam, ref keyboardHookStruct lParam);

        public struct keyboardHookStruct
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        const int WH_KEYBOARD_LL = 13;
        const int WM_KEYDOWN = 0x100;
        const int WM_KEYUP = 0x101;
        const int WM_SYSKEYDOWN = 0x104;
        const int WM_SYSKEYUP = 0x105;
        #endregion

        #region Instance Variables
        /// <summary>
        /// The collections of keys to watch for
        /// </summary>
        public List<Keys> HookedKeys = new List<Keys>();
        /// <summary>
        /// Handle to the hook, need this to unhook and call the next hook
        /// </summary>
        IntPtr hhook = IntPtr.Zero;
        #endregion

        #region Events
        /// <summary>
        /// Occurs when one of the hooked keys is pressed
        /// </summary>
        public event KeyEventHandler KeyDown;
        /// <summary>
        /// Occurs when one of the hooked keys is released
        /// </summary>
        public event KeyEventHandler KeyUp;
        #endregion

        #region Constructors and Destructors
        /// <summary>
        /// Initializes a new instance of the <see cref="globalKeyboardHook"/> class and installs the keyboard hook.
        /// </summary>
        public globalKeyboardHook()
        {
            hook();
        }

        /// <summary>
        /// Releases unmanaged resources and performs other cleanup operations before the
        /// <see cref="globalKeyboardHook"/> is reclaimed by garbage collection and uninstalls the keyboard hook.
        /// </summary>
        ~globalKeyboardHook()
        {
            unhook();
        }
        #endregion

        #region Public Methods
        /// <summary>
        /// Installs the global hook
        /// </summary>
        public void hook()
        {
            IntPtr hInstance = LoadLibrary("User32");
            hhook = SetWindowsHookEx(WH_KEYBOARD_LL, hookProc, hInstance, 0);
        }

        /// <summary>
        /// Uninstalls the global hook
        /// </summary>
        public void unhook()
        {
            UnhookWindowsHookEx(hhook);
        }

        /// <summary>
        /// The callback for the keyboard hook
        /// </summary>
        /// <param name="code">The hook code, if it isn't >= 0, the function shouldn't do anyting</param>
        /// <param name="wParam">The event type</param>
        /// <param name="lParam">The keyhook event information</param>
        /// <returns></returns>
        public int hookProc(int code, int wParam, ref keyboardHookStruct lParam)
        {
            if (code >= 0)
            {
                Keys key = (Keys)lParam.vkCode;
                if (HookedKeys.Contains(key))
                {
                    KeyEventArgs kea = new KeyEventArgs(key);
                    if ((wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN) && (KeyDown != null))
                    {
                        KeyDown(this, kea);
                    }
                    else if ((wParam == WM_KEYUP || wParam == WM_SYSKEYUP) && (KeyUp != null))
                    {
                        KeyUp(this, kea);
                    }
                    if (kea.Handled)
                        return 1;
                }
            }
            return CallNextHookEx(hhook, code, wParam, ref lParam);
        }
        #endregion

        #region DLL imports
        /// <summary>
        /// Sets the windows hook, do the desired event, one of hInstance or threadId must be non-null
        /// </summary>
        /// <param name="idHook">The id of the event you want to hook</param>
        /// <param name="callback">The callback.</param>
        /// <param name="hInstance">The handle you want to attach the event to, can be null</param>
        /// <param name="threadId">The thread you want to attach the event to, can be null</param>
        /// <returns>a handle to the desired hook</returns>
        [DllImport("user32.dll")]
        static extern IntPtr SetWindowsHookEx(int idHook, keyboardHookProc callback, IntPtr hInstance, uint threadId);

        /// <summary>
        /// Unhooks the windows hook.
        /// </summary>
        /// <param name="hInstance">The hook handle that was returned from SetWindowsHookEx</param>
        /// <returns>True if successful, false otherwise</returns>
        [DllImport("user32.dll")]
        static extern bool UnhookWindowsHookEx(IntPtr hInstance);

        /// <summary>
        /// Calls the next hook.
        /// </summary>
        /// <param name="idHook">The hook id</param>
        /// <param name="nCode">The hook code</param>
        /// <param name="wParam">The wparam.</param>
        /// <param name="lParam">The lparam.</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        static extern int CallNextHookEx(IntPtr idHook, int nCode, int wParam, ref keyboardHookStruct lParam);

        /// <summary>
        /// Loads the library.
        /// </summary>
        /// <param name="lpFileName">Name of the library</param>
        /// <returns>A handle to the library</returns>
        [DllImport("kernel32.dll")]
        static extern IntPtr LoadLibrary(string lpFileName);
        #endregion
    }