UWP C＃中的中心控件

Question

我试图在我的应用窗口中居中文本块。我在文本块的Loaded事件处理程序中尝试了这段代码：

    private void textBlock1_Loaded(object sender, RoutedEventArgs e)
    {
        Debug.WriteLine("textBlock1_Loaded");
        double textBlockWidth = textBlock1.Width;
        double textBlockHeight = textBlock1.Height;
        double gridWidth = grid1.Width;
        double gridHeight = grid1.Height;
        double leftRightMargin_center = (gridWidth - textBlockWidth) / 2;
        double topBottomMargin_center = (gridHeight - textBlockHeight) / 2;
        double topMargin_needed = topBottomMargin_center - 25;
        double bottomMargin_needed = topBottomMargin_center + 25;
        double leftMargin_needed = leftRightMargin_center;
        double rightMargin_needed = leftRightMargin_center;
        textBlock1.Margin = new Thickness(leftMargin_needed, topMargin_needed, rightMargin_needed, leftMargin_needed);
    }

以下是生成的应用：

我在这里做错了吗？是的，那是我在这个帖子中唯一的问题。