如何在带有C＃的PowerPoint上使表中的文本具有大纲？

Question

无法在表格单元格中显示文本的“文本轮廓”

var sel = Globals.ThisAddIn.Application.ActiveWindow.Selection;
sel.TextRange2.Font.Line.Visible = MsoTriState.msoTrue;
sel.TextRange2.Font.Line.Transparency = 1;

上面的

代码使形状中的文本抗锯齿。表格的单元格中的文本将不起作用。我在下面尝试过，仅使文本加粗。似乎Font（实际上是Font2）对象是只读的，但是我可以在Powerpoint上手动执行相同操作

private void Button1_Click_1(object sender, RibbonControlEventArgs e)
{
    var sel = Globals.ThisAddIn.Application.ActiveWindow.Selection;
    try
    {
        var tab = Globals.ThisAddIn.Application.ActiveWindow.Selection.ShapeRange.Table;
        int col = sel.ShapeRange.Table.Columns.Count;
        int row = sel.ShapeRange.Table.Rows.Count;
        for (int i = 1; i <= row; i++)
        {
            for (int j = 1; j <= col; j++)
            {
                tab.Cell(i, j).Shape.TextFrame2.TextRange.Font.Bold = MsoTriState.msoTrue;
                tab.Cell(i, j).Shape.TextFrame2.TextRange.Font.Line.Visible = MsoTriState.msoTrue;
                tab.Cell(i, j).Shape.TextFrame2.TextRange.Font.Line.Transparency = 1;
            }
        }
    }
    catch
    {

    }
}