ActionResult returning a Stream

Question

My ActionResult returns a File but I also need it to conditionally return a Stream.

I have not been able to find documentation on how an ActionResult can return a Stream.

Here is my code for return of a file:

    return File(memoryStream,.... ) 

As mentioned, I need to return just a Stream.

Answer 1

Updated for MVC5 2020:

my previous answer was dated.

as of now, the File returns different type of ActionResult depends on given arguments

// to return FileStreamResult return File(memoryStream, "application/pdf"); // or.. return File(memoryStream, "application/pdf", "file_name"); 

---

Use FileStreamResult:

MemoryStream stream = someService.GetStream();  return new FileStreamResult(stream, "application/pdf")