Streaming In Memory Word Document using OpenXML SDK w/ASP.NET results in “corrupt” document

Question

I am unable to stream a word document that I create on the fly down to the browser. I am constantly getting a message from Microsoft Word that the document is corrupt.

Answer 1

(This is using OpenXML SDK v 2.10.0 and .Net Core v2.2)

I know this has been answered but I wanted to throw out another option. It is correct that trying to send a stream back in File() like below will result in a corrupt document:

                MemoryStream updateStream = new MemoryStream();
                wordDocument.Save();
                wordDocument.Clone(updateStream);


                return File(updateStream, "application/vnd.openxmlformats-officedocument.wordprocessingml.document");

`

A super simple alternative/workaround would be to simply convert your stream to a byte[] like below and it will result in a working word docx

                MemoryStream updateStream = new MemoryStream();
                wordDocument.Save();
                wordDocument.Clone(updateStream);


                return File(updateStream.ToArray(), "application/vnd.openxmlformats-officedocument.wordprocessingml.document");