C#使用全局键事件

using System;
using System.Windows.Forms;

class Program
{
    private static KeyboardHook keyboardHook;

    static void Main()
    {
        // 创建全局键盘钩子
        keyboardHook = new KeyboardHook();

        // 注册事件处理方法
        keyboardHook.KeyDown += KeyboardHook_KeyDown;
        keyboardHook.KeyUp += KeyboardHook_KeyUp;

        // 启动全局键盘钩子
        keyboardHook.Start();

        // 等待用户按下Esc键退出程序
        while (true)
        {
            if (Console.ReadKey().Key == ConsoleKey.Escape)
                break;
        }

        // 停止全局键盘钩子
        keyboardHook.Stop();
    }

    private static void KeyboardHook_KeyDown(Keys key)
    {
        // 处理按键按下事件
        Console.WriteLine("按下键：" + key.ToString());
    }

    private static void KeyboardHook_KeyUp(Keys key)
    {
        // 处理按键释放事件
        Console.WriteLine("释放键：" + key.ToString());
    }
}

class KeyboardHook
{
    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;
    private const int WM_KEYUP = 0x0101;
    private const int WM_SYSKEYDOWN = 0x0104;
    private const int WM_SYSKEYUP = 0x0105;

    private LowLevelKeyboardProc keyboardProc;
    private IntPtr hookId = IntPtr.Zero;

    public event Action<Keys> KeyDown;
    public event Action<Keys> KeyUp;

    public void Start()
    {
        keyboardProc = HookCallback;
        hookId = SetHook(keyboardProc);
    }

    public void Stop()
    {
        UnhookWindowsHookEx(hookId);
    }

    private IntPtr SetHook(LowLevelKeyboardProc proc)
    {
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
        }
    }

    private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0)
        {
            Keys key = (Keys)Marshal.ReadInt32(lParam);

            if (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN)
            {
                KeyDown?.Invoke(key);
            }
            else if (wParam == (IntPtr)WM_KEYUP || wParam == (IntPtr)WM_SYSKEYUP)
            {
                KeyUp?.Invoke(key);
            }
        }

        return CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
    }

    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UnhookWindowsHookEx(IntPtr hhk);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);
}