title: Convert docx in bytes[] format to pdf in bytes[] format with openXML or similar
body: <p>I have a function right now that converts a docx(in bytes[] format) to a pdf(in bytes[] format) using Microsoft.Office.Interop.Word</p>
  
  <p>And it works great. Except for the fact that it doesn't work online since it requires WinOffice to be installed on the server which I cannot do anything about.</p>
  
  <p>So I need to go to something else and I'm thinking about openXML(Unless you know any better ways).</p>
  
  <p>But how exactly would I go around this?
  I just want to take this docx file, convert and return it as a pdf in bytes[] format.</p>
  
  <p>My previous code in Microsoft.Office looks like this</p>
  
  <pre><code>public static byte[] ConvertDocx2PDF(byte[] DocxFile, string FileName)
  {
      try
      {
          string path = Path.Combine(HttpRuntime.AppDomainAppPath, "MailFiles/DOCX2PDF");
  
          if (!Directory.Exists(path))
              Directory.CreateDirectory(path);
  
          Guid id = Guid.NewGuid();
  
          FileName = id.ToString() + FileName;
  
          path += "/" + FileName;
  
  
  
          if (File.Exists(path))
              File.Delete(path);
  
          File.WriteAllBytes(path, DocxFile);
  
          Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application();
  
          object oMissing = System.Reflection.Missing.Value;
  
          word.Visible = false;
          word.ScreenUpdating = false;
  
          // Cast as Object for word Open method
          Object filename = (Object)path;
          // Use the dummy value as a placeholder for optional arguments
          Microsoft.Office.Interop.Word.Document doc = word.Documents.Open(ref filename, ref oMissing,
              ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
              ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
              ref oMissing, ref oMissing, ref oMissing, ref oMissing);
          doc.Activate();
          object outputFileName = (object)path.ToLower().Replace(".docx", ".pdf");
          object fileFormat = Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatPDF;
  
          if (File.Exists(outputFileName.ToString()))
              File.Delete(outputFileName.ToString());
  
          // Save document into PDF Format
          doc.SaveAs(ref outputFileName,
              ref fileFormat, ref oMissing, ref oMissing,
              ref oMissing, ref oMissing, ref oMissing, ref oMissing,
              ref oMissing, ref oMissing, ref oMissing, ref oMissing,
              ref oMissing, ref oMissing, ref oMissing, ref oMissing);
  
          object saveChanges = Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges;
          ((Microsoft.Office.Interop.Word._Document)doc).Close(ref saveChanges, ref oMissing, ref oMissing);
          doc = null;
  
          ((Microsoft.Office.Interop.Word._Application)word).Quit(ref oMissing, ref oMissing, ref oMissing);
          word = null;
  
          try
          {
              File.Delete(path);
          }
          catch { }
  
          return File.ReadAllBytes(path.ToLower().Replace(".docx", ".pdf"));
      }
      catch (Exception e)
      {
  
      }
      byte[] erroByte = new byte[0];
      return erroByte;
  }
  </code></pre>
  
  <p>As said. It works great but doesn't work on my server. </p>
  
  <p>Any idea how to do this in openXML or any other?</p>
  
  <p>Thank you for your time</p>