检查是否在Winforms中按下了热键

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

public partial class MainForm : Form
{
    // 导入user32.dll库
    [DllImport("user32.dll")]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);

    // 导入user32.dll库
    [DllImport("user32.dll")]
    private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    // 热键ID，用于标识不同的热键
    private const int HotkeyId = 1;

    // 修饰键和热键代码
    private const int Modifiers = (int)Keys.Control;
    private const int Hotkey = (int)Keys.A;

    public MainForm()
    {
        InitializeComponent();
    }

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);

        // 注册热键
        RegisterHotKey(this.Handle, HotkeyId, Modifiers, Hotkey);
    }

    protected override void OnFormClosed(FormClosedEventArgs e)
    {
        base.OnFormClosed(e);

        // 取消注册热键
        UnregisterHotKey(this.Handle, HotkeyId);
    }

    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

        // 检查消息是否为热键消息
        if (m.Msg == 0x0312 && m.WParam.ToInt32() == HotkeyId)
        {
            // 执行热键操作
            MessageBox.Show("热键被按下！");
        }
    }
}