"Cannot access a closed Stream" when trying to return PDF from controller using iText

Question

I'm trying to copy pages from an existing PDF to a new one and return it. I'm writing to the new PDF with memory, but it returns an error stating

Cannot access a closed Stream.

Here is my code:

var ms = new MemoryStream();
    
using PdfReader pdfReader = new PdfReader(pdfStream);
using PdfDocument pdfDocument = new PdfDocument(pdfReader);
    
using PdfWriter pdfWriter = new PdfWriter(ms);
using PdfDocument newDocument = new PdfDocument(pdfWriter);
pdfDocument.CopyPagesTo(1, 2, newDocument);
            
return File(ms, "application/pdf");

Yong Shun · Accepted Answer · 2025-11-02 09:22:44Z

6

You have to call iText.IO.Source.OutputStream<T>.SetCloseStream(false) to prevent the Stream instance from disposing by default when disposing the OutputStream.

using PdfWriter pdfWriter = new PdfWriter(ms);
pdfWriter.SetCloseStream(false);

answered Nov 2 at 9:22

Yong Shun

54.5k6 gold badges38 silver badges66 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Charlieface Nov 2 at 13:19

Also need to rewind the stream to Position = 0

Sir Rufo Nov 5 at 2:01

or return File(ms.ToArray(), "application/pdf");

Collectives™ on Stack Overflow

"Cannot access a closed Stream" when trying to return PDF from controller using iText

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related