在WPF中处理Windows消息

protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
            if (hwndSource != null)
                hwndSource.AddHook(new HwndSourceHook(this.WndProc));
        }

protected virtual IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
    switch (msg)
    {
        case Win32.WM_NCHITTEST:
            {
                Point MouseScreenPoint = new Point(lParam.ToInt32() & 0xFFFF, lParam.ToInt32() >> 16);
                Point MouseWindowPoint = this.PointFromScreen(MouseScreenPoint);
                if (MouseWindowPoint.X < 10 && MouseWindowPoint.Y < 10)
                {
                    handled = true;
                    return (IntPtr)Win32.HTTOPLEFT;
                }
                
                break;
            }
    }
    return IntPtr.Zero;
}