捕获所有键盘输入，而不考虑Windows窗体应用程序中具有焦点的控件

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;

class Program
{
    // 定义全局钩子的委托类型
    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

    // 导入Windows API函数，用于安装和卸载全局钩子
    [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);

    // 全局钩子的回调函数
    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        // 如果nCode小于0，则直接调用下一个钩子
        if (nCode < 0)
        {
            return CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
        }

        // 获取键盘事件的信息
        var keyboardEvent = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));

        // 输出按键信息
        Console.WriteLine($"Key: {(Keys)keyboardEvent.VirtualKeyCode}");

        // 调用下一个钩子
        return CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
    }

    // 键盘事件的结构体
    [StructLayout(LayoutKind.Sequential)]
    private struct KeyboardHookStruct
    {
        public int VirtualKeyCode;
        public int ScanCode;
        public int Flags;
        public int Time;
        public IntPtr ExtraInfo;
    }

    static void Main()
    {
        // 安装全局钩子
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            IntPtr hHook = SetWindowsHookEx(13, HookCallback, GetModuleHandle(curModule.ModuleName), 0);
            if (hHook == IntPtr.Zero)
            {
                Console.WriteLine("Failed to install hook!");
                return;
            }

            // 进入消息循环，等待键盘事件
            Application.Run();

            // 卸载全局钩子
            bool result = UnhookWindowsHookEx(hHook);
            if (!result)
            {
                Console.WriteLine("Failed to uninstall hook!");
            }
        }
    }
}