检测密钥序列C＃WPF

Question

我在C＃WPF中开发了一个应用程序。在新的要求中，我需要捕获仅由字母和数字组成的Key组合。例如，AC，T2等...

我已经实现了一个较低级别的监听器挂钩，但我不知道为该组合实现记录器。

有什么想法吗？

这是钩子：

 internal class InterceptKeys
{
    #region Delegates

    /// <summary>
    /// Delegate from keypress
    /// </summary>
    /// <param name="nCode">Code of Key</param>
    /// <param name="wParam">wParam</param>
    /// <param name="lParam">lParam</param>
    /// <returns>return next Call</returns>
    public delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

    #endregion

    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;

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

    [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)]
    public static extern bool UnhookWindowsHookEx(IntPtr hhk);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public 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);
}