Openxml presentation: how to download(web httpresponse) file without save in physical path.

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 i replace text in presentationDocumentNew 
 Save file on Physical path - Its worked
  presentationDocumentNew.SaveAs(tmpFilePath);
  presentationDocumentNew.Close();

Question: OpenXml Presentation(PPT-pptx) i don't want to save in physical part. I just want to download file directly from browser using HttpResponse
 I try many way to But its not worked. File downloed but its correpted.
    Try: 1) presentationDocumentNew.PresentationPart.GetStream().CopyTo(Response.OutputStream);
	     2) take Stream or Memory stream or FileStream, set in response
		    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
          Response.AddHeader("Content-Disposition", "attachment; filename=" + "cccc.pptx");
          ......etc
 Not worked all

What I have tried:

<pre>PresentationDocument presentationDocumentNew = null;

using (PresentationDocument presentationDocument = PresentationDocument.Open(file, false))
                   {
                       presentationDocumentNew = (PresentationDocument)presentationDocument.Clone();
                       presentationDocument.Close();
                   }

if (presentationDocumentNew != null)
                    {

// i replace text in presentationDocumentNew 
// Save file on Physical path - Its worked
//  presentationDocumentNew.SaveAs(tmpFilePath);
//  presentationDocumentNew.Close();

//Question: i don't want to save in physical part. I just want to download file directly from browser using HttpResponse
// I try many way to But its not worked. File downloed but its correpted.
//    Try: 1) presentationDocumentNew.PresentationPart.GetStream().CopyTo(Response.OutputStream);
//	     2) take Stream or Memory stream or FileStream, set in response
//		    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
//          Response.AddHeader("Content-Disposition", "attachment; filename=" + "cccc.pptx");
//          ......etc
// Not worked all

Posted 15-Nov-19 19:13pm

kpanchal

Updated 18-Nov-19 10:13am

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RickZeeland · Answer 1 · 2019-11-15T20:59:00

Solution 1

Maybe you can try WebClient, see examples here: https://www.dotnetperls.com/webclient[^]

Or try WebRequest, see example here: How to: Request data by using the WebRequest class | Microsoft Docs[^]

Posted 15-Nov-19 20:59pm

RickZeeland

Richard Deeming · Answer 2 · 2019-11-18T10:14:00

This solution on StackOverflow[^] is for Word documents, but the same approach will apply here:

C#

var memoryStream = new MemoryStream();

using (FileStream fileStream = File.OpenRead(file))
{
    fileStream.CopyTo(memoryStream);
}

memoryStream.Position = 0;

using (PresentationDocument presentationDocument = PresentationDocument.Open(memoryStream, true))
{
    ... Change the presentation here ...
    
    presentationDocument.Close();
}

memoryStream.Position = 0;

Response.ContentType = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
Response.AddHeader("Content-Disposition", "attachment; filename=" + "cccc.pptx");
memoryStream.CopyTo(Response.OutputStream);