在c#(wpf)中捕获windows键

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

public partial class MainWindow : Window
{
    // 定义Windows API函数
    [DllImport("user32.dll")]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

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

    // 定义热键ID
    private const int HOTKEY_ID = 1;

    public MainWindow()
    {
        InitializeComponent();

        // 注册热键
        ComponentDispatcher.ThreadFilterMessage += ComponentDispatcher_ThreadFilterMessage;
        RegisterHotKey(new WindowInteropHelper(this).Handle, HOTKEY_ID, 0, (uint)KeyInterop.VirtualKeyFromKey(Key.LWin));
    }

    private void ComponentDispatcher_ThreadFilterMessage(ref MSG msg, ref bool handled)
    {
        if (msg.message == 0x0312 && (int)msg.wParam == HOTKEY_ID)
        {
            // 捕获Windows键
            MessageBox.Show("Windows键被按下");
            handled = true;
        }
    }

    protected override void OnClosed(EventArgs e)
    {
        // 取消注册热键
        UnregisterHotKey(new WindowInteropHelper(this).Handle, HOTKEY_ID);
        ComponentDispatcher.ThreadFilterMessage -= ComponentDispatcher_ThreadFilterMessage;
        base.OnClosed(e);
    }
}