Introduction

public static void GetDocumentInformations()
{
  Console.WriteLine( "=== GET DOCUMENT INFORMATIONS ===" );
  var filename = "TikainAction.pdf";

  // Load a pdf document.
  using( var pdfDoc = PdfDocument.Load( PdfDocumentsSample.PdfDocumentsSampleResourceDirectory + filename ) )
  {
    var outputFileName = "GetDocumentInformations.pdf";
    var outputPath = PdfDocumentsSample.PdfDocumentsSampleOutputDirectory + outputFileName;

    // Create a pdf document.
    using( var pdfoutput = PdfDocument.Create( outputPath ) )
    {
      // Get the first page of the document.
      var page = pdfoutput.Pages.First();

      // Add title.
      var titleStyle = TextStyle.WithFont( pdfoutput.Fonts.GetStandardFont( StandardFontType.Helvetica ), 15d );
      page.AddParagraph( "Get Document Informations", titleStyle, new ParagraphStyle( ParagraphHorizontalAlignment.Center ) );

      var exportData = new ExportInfoToPdf();

      // Add Text.
      exportData.AddLine( pdfoutput, $"Printing Document info from: {filename}\n\n", Color.Red );
      exportData.AddLine( pdfoutput, $"Total pages: {pdfDoc.Pages.Count}" );
      exportData.AddLine( pdfoutput, $"PDF Version: {pdfDoc.Version}" );

      if( pdfDoc.Informations != null )
      {
        // Add Text for metadata Document Informations.
        exportData.AddLine( pdfoutput, $"Title: {pdfDoc.Informations.Title ?? "N/A"}" );
        exportData.AddLine( pdfoutput, $"Author: {pdfDoc.Informations.Author ?? "N/A"}" );
        exportData.AddLine( pdfoutput, $"Subject: {pdfDoc.Informations.Subject ?? "N/A"}" );
        exportData.AddLine( pdfoutput, $"Creator: {pdfDoc.Informations.Creator ?? "N/A"}" );
        exportData.AddLine( pdfoutput, $"Producer: {pdfDoc.Informations.Producer ?? "N/A"}" );
        exportData.AddLine( pdfoutput, $"Creation date: {pdfDoc.Informations.CreationDate?.ToString() ?? "N/A"}" );
        exportData.AddLine( pdfoutput, $"Modification date: {pdfDoc.Informations.ModifiedDate?.ToString() ?? "N/A"}" );
      }

      // Save the output document.
      pdfoutput.Save();
      Console.WriteLine( $"Info exported to path: {outputFileName}" );
    }
  }
}