如何在托管wpf用户控件时在winforms mdi应用程序中获取默认的ctrl+tab功能

在主机winform中,为宿主wpf控件添加previewkeydown处理程序,该处理程序捕获ctrl-(shift)选项卡,激活下一个或上一个mdi子项,并将事件标记为已处理:

TheHostedWpfControl.PreviewKeyDown += (s, e) =>
{
    if (e.Key == Key.Tab && ModifierKeys.HasFlag(Keys.Control))
    {
        ActivateNextMdiChild(ModifierKeys.HasFlag(Keys.Shift));
        e.Handled = true;
    }
};

下面是下一个/prev mdi子激活:

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, int lParam);

private const int WM_MDINEXT = 0x224;

private void ActivateNextMdiChild(bool backward = false)
{
    if (MdiParent != null)
    {
        MdiClient mdiClient = MdiParent.Controls.OfType<MdiClient>().FirstOrDefault();
        if (mdiClient != null)
        {
            SendMessage(mdiClient.Handle, WM_MDINEXT, Handle, backward ? 1 : 0);
        }
    }
}