OpenXml - iterate through a paragraph space and search if the run has italics or bold text

If you are only interested in inline tags, the following code may help. Just change the Convert () method to whatever you want.

using System.Linq;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;

class Program
{
    static void Main(string[] args)
    {
        using (var doc = WordprocessingDocument.Open(@"c:\doc1.docx", true))
        {
            foreach (var paragraph in doc.MainDocumentPart.RootElement.Descendants<Paragraph>())
            {
                foreach (var run in paragraph.Elements<Run>())
                {
                    if (run.RunProperties != null &&
                        (run.RunProperties.Bold != null && (run.RunProperties.Bold.Val == null || run.RunProperties.Bold.Val) ||
                        run.RunProperties.Italic != null && (run.RunProperties.Italic.Val == null || run.RunProperties.Italic.Val)))
                        Process(run);
                }
            }
        }
    }

    static void Process(Run run)
    {
        string text = run.Elements<Text>().Aggregate("", (s, t) => s + t.Text);
        run.RemoveAllChildren<Text>();
        run.AppendChild(new Text(Convert(text)));

    }

    static string Convert(string text)
    {
        return text.ToUpper();
    }
}