如何在运行时重置高度并重新居中WPF窗体?

我尝试在加载的事件中重置窗体的高度,但窗体的位置不再位于屏幕的中心。

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    var manualHeight = 0
        + this.MessageRow.ActualHeight
        + this.ButtonsRow.ActualHeight
    ;
    this.Height = manualHeight;

    //What to do to re-center the form?
}

如果你知道怎么做,请帮忙。太好了,谢谢!

[编辑]

xandy 救命啊。

var screenHeight += System.Windows.SystemParameters.PrimaryScreenHeight;
window.Top = (screenHeight - manualHeight) / 2;