Export crystal report from ihttpactionresult in webapi

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I am trying to export crystal report from asp.net web API IhttpActionResult, the report gets exported but is corrupt and cannot be repaired after download. however, the same report when exported to disk if fine and usable. please how do i achieve this, thank you.

What I have tried:

IHttpActionResult response;
           HttpResponseMessage responseMsg = new
           responseMsg.Content = new ByteArrayContent(new StreamContent(rd.ExportToStream(ExportFormatType.PortableDocFormat)).ReadAsByteArrayAsync().Result);
           responseMsg.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
           responseMsg.Content.Headers.ContentDisposition.FileName = "Print.pdf";
           responseMsg.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");

           return response;

Posted 14-Jul-20 23:22pm

Enobong Adahada

Updated 14-Jul-20 23:51pm

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Richard Deeming · Answer 1 · 2020-07-14T23:51:00

Solution 1

Don't use .Result to force an asynchronous operation to run synchronously. You can just make your action async and await the operation.

But in this case, you don't need the ByteArrayContent at all. Just use the StreamContent directly.

C#

responseMsg.Content = new StreamContent(rd.ExportToStream(ExportFormatType.PortableDocFormat), 1024 * 1024);

Posted 14-Jul-20 23:51pm

Richard Deeming

Comments

Enobong Adahada 15-Jul-20 7:18am

Thank you, Richard, for the prompt response, I have tried out your solution and I get the same error when I have downloaded the file and attempt to open it, "there was an error opening this document, the file is damaged and could not be repaired.

Richard Deeming 15-Jul-20 7:25am

At a guess, you might need to reset the position of the stream after exporting:

Stream pdfStream = rd.ExportToStream(ExportFormatType.PortableDocFormat);
if (pdfStream.CanSeek) pdfStream.Seek(0L, SeekOrigin.Begin);
responseMsg.Content = new StreamContent(pdfStream, 1024 * 1024);

Otherwise, you'll need to open up the downloaded file in a binary editor to see whether it looks OK.

Enobong Adahada 15-Jul-20 8:29am

Thank you again, I have tried this, and it gives the same issues.

Richard Deeming 15-Jul-20 8:41am

Then you'll need to open up the downloaded file in a binary editor to see what the content looks like.