更改窗口大小时调整WPF弹出窗口位置

<Window ...
        SizeChanged="Window_SizeChanged">

private void Window_SizeChanged(object sender, SizeChangedEventArgs e)
{
    // 获取当前窗口的位置和大小
    double windowLeft = Left;
    double windowTop = Top;
    double windowWidth = Width;
    double windowHeight = Height;

    // 获取弹出窗口的位置和大小
    double popupLeft = popupWindow.Left;
    double popupTop = popupWindow.Top;
    double popupWidth = popupWindow.Width;
    double popupHeight = popupWindow.Height;

    // 计算新的弹出窗口位置
    double newPopupLeft = windowLeft + (windowWidth - popupWidth) / 2;
    double newPopupTop = windowTop + (windowHeight - popupHeight) / 2;

    // 设置弹出窗口的新位置
    popupWindow.Left = newPopupLeft;
    popupWindow.Top = newPopupTop;
}

<Popup x:Name="popupWindow" IsOpen="True">
    <Border Background="White" BorderBrush="Black" BorderThickness="1">
        <!-- 弹出窗口的内容 -->
    </Border>
</Popup>