C#中如何设置热键，并检测冲突

C#中如何设置热键，并检测冲突

网上找到一段c#代码来注册热键，但是不知道怎么检测热键是否被注册？

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

public class SystemHotKey
{
    /// <summary>
    /// 如果函数执行成功，返回值不为0。
    /// 如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。
    /// </summary>
    /// <param name="hWnd">要定义热键的窗口的句柄</param>
    /// <param name="id">定义热键ID（不能与其它ID重复）</param>
    /// <param name="fsModifiers">标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效</param>
    /// <param name="vk">定义热键的内容</param>
    /// <returns></returns>
    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool RegisterHotKey(IntPtr hWnd, int id, KeyModifiers fsModifiers, Keys vk);

    /// <summary>
    /// 注销热键
    /// </summary>
    /// <param name="hWnd">要取消热键的窗口的句柄</param>
    /// <param name="id">要取消热键的ID</param>
    /// <returns></returns>
    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    /// <summary>
    /// 辅助键名称。
    /// Alt, Ctrl, Shift, WindowsKey
    /// </summary>
    [Flags()]
    public enum KeyModifiers { None = 0, Alt = 1, Ctrl = 2, Shift = 4, WindowsKey = 8 }

    /// <summary>
    /// 注册热键
    /// </summary>
    /// <param name="hwnd">窗口句柄</param>
    /// <param name="hotKey_id">热键ID</param>
    /// <param name="keyModifiers">组合键</param>
    /// <param name="key">热键</param>
    public static void RegHotKey(IntPtr hwnd, int hotKeyId, KeyModifiers keyModifiers, Keys key)
    {
        if (!RegisterHotKey(hwnd, hotKeyId, keyModifiers, key))
        {
            int errorCode = Marshal.GetLastWin32Error();
            if (errorCode == 1409)
            {
                MessageBox.Show("热键被占用 ！");
            }
            else
            {
                MessageBox.Show("注册热键失败！错误代码：" + errorCode);
            }
        }
    }

    /// <summary>
    /// 注销热键
    /// </summary>
    /// <param name="hwnd">窗口句柄</param>
    /// <param name="hotKey_id">热键ID</param>
    public static void UnRegHotKey(IntPtr hwnd, int hotKeyId)
    {
        //注销指定的热键
        UnregisterHotKey(hwnd, hotKeyId);
    }

}