C# Modify Word Document Paragraphs

Modify-Word-Paragraphs.cs

/// <summary>
/// Loads a Word Document with structured content using 
/// <a href="https://www.nuget.org/packages/FileFormat.Words">FileFormat.Words</a>.
/// Modifies paragraphs by prepending 'Modified Heading :' for styled paragraphs
/// and 'Modified Run :' for each run within normal paragraphs, preserving the existing format.
/// Saves the modified Word Document.
/// </summary>
/// <param name="documentDirectory">
/// The directory where the Word Document to load is present and
/// the modified document will be saved (default is the the root of your project).
/// </param>
/// <param name="filename">
/// The name of the Word Document file to modify (default is "WordParagraphs.docx" - please replace it 
/// with your word document present at the directory defined by documentDirectory).
/// </param>
/// <param name="filenameModified">
/// The name of the modified Word Document (default is "ModifiedWordParagraphs.docx") to be saved to the directlry 
/// defined by documentDirectory.
/// </param>
public void ModifyWordParagraphs(string documentDirectory = docsDirectory,
            string filename = "WordParagraphs.docx", string filenameModified = "ModifiedWordParagraphs.docx")
{
    try
    {
        // Load the Word Document
        var doc = new FileFormat.Words.Document($"{documentDirectory}/{filename}");
        var body = new FileFormat.Words.Body(doc);
    
        foreach (var paragraph in body.Paragraphs)
        {
            foreach (var run in paragraph.Runs)
            {
                // Prepend 'Modified Heading :' for styled paragraphs
                // and 'Modified Run :' for each run within normal paragraphs, preserving the existing format
                run.Text = paragraph.Style.Contains("Heading") ? $"Modified Heading: {run.Text}" : $"Modified Run : {run.Text}";
            }
            // Update the paragraph in the document
            doc.Update(paragraph);
        }

        // Save the modified Word Document
        doc.Save($"{documentDirectory}/{filenameModified}");
        Console.WriteLine($"Word Document {filename} Modified and Saved As {filenameModified}. Please check directory: {Path.GetFullPath(documentDirectory)}");
    }
    catch (Exception ex)
    {
        throw new FileFormat.Words.FileFormatException("An error occurred.", ex);
    }
}