Analisar arquivos PPTX com C#

using var presentation = new Presentation("presentation.pptx");
var textFrames = SlideUtil.GetAllTextFrames(presentation, true);

foreach (var textFrame in textFrames)
{
    foreach (var paragraph in textFrame.Paragraphs)
    {
        foreach (var portion in paragraph.Portions)
        {
            Console.WriteLine(portion.Text);
            Console.WriteLine(portion.PortionFormat.FontHeight);

            var latinFont = portion.PortionFormat.LatinFont;
            if (latinFont is not null)
            {
                Console.WriteLine(latinFont.FontName);
            }
        }
    }
}