表单元格中的垂直对齐问题，flowdocument C#

using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace FlowDocumentExample
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            // 创建一个新的FlowDocument
            FlowDocument flowDoc = new FlowDocument();

            // 创建一个表
            Table table = new Table();
            table.Columns.Add(new TableColumn { Width = new GridLength(1, GridUnitType.Star) });
            table.Columns.Add(new TableColumn { Width = new GridLength(1, GridUnitType.Star) });

            // 添加表头
            TableRow headerRow = new TableRow();
            TableCell headerCell1 = new TableCell(new Paragraph(new Run("Header 1")));
            TableCell headerCell2 = new TableCell(new Paragraph(new Run("Header 2")));
            headerRow.Cells.Add(headerCell1);
            headerRow.Cells.Add(headerCell2);
            table.RowGroups.Add(new TableRowGroup { Rows = { headerRow } });

            // 添加表格内容
            TableRow contentRow = new TableRow();
            TableCell contentCell1 = new TableCell(new Paragraph(new Run("Content 1")) { TextAlignment = TextAlignment.Center });
            TableCell contentCell2 = new TableCell(new Paragraph(new Run("Content 2")) { TextAlignment = TextAlignment.Center });
            contentRow.Cells.Add(contentCell1);
            contentRow.Cells.Add(contentCell2);
            table.RowGroups.Add(new TableRowGroup { Rows = { contentRow } });

            flowDoc.Blocks.Add(table);

            // 将FlowDocument显示在RichTextBox中
            richTextBox.Document = flowDoc;
        }
    }
}