Writing MemoryStream to Response Object

Question

I am using the following code to stream pptx which is in a MemoryStream object but when I open it I get Repair message in PowerPoint  what is the correct way of writing MemoryStream to Response Object   HttpResponse response   HttpContext Current Response  response Clear    response AppendHeader  Content-Type    application vnd openxmlformats-officedocument presentationml presentation    response AppendHeader  Content-Disposition   string Format  attachment filename  0  pptx    getLegalFileName CurrentPresentation Presentation NM                     response BinaryWrite masterPresentation ToArray     response End

User · Answer

First We Need To Write into our Memory Stream and then with the help of Memory Stream method "WriteTo" we can write to the Response of the Page as shown in the below code.

   MemoryStream filecontent = null;
   filecontent =//CommonUtility.ExportToPdf(inputXMLtoXSLT);(This will be your MemeoryStream Content)
   Response.ContentType = "image/pdf";
   string headerValue = string.Format("attachment; filename={0}", formName.ToUpper() + ".pdf");
   Response.AppendHeader("Content-Disposition", headerValue);

   filecontent.WriteTo(Response.OutputStream);

   Response.End();

FormName is the fileName given,This code will make the generated PDF file downloadable by invoking a PopUp.

User · Answer

Assuming you can get a Stream  FileStream or MemoryStream for instance  you can do this   Stream file    Some Code that Gets you a stream   var filename    The name of the file you want to user to download see    if  file    null  amp  amp  file CanRead        context Response AddHeader  Content-Disposition    attachment  filename       filename              context Response ContentType    application octet-stream       context Response ClearContent        file CopyTo context Response OutputStream       Thats a copy and paste from some of my working code  so the content type might not be what youre looking for  but writing the stream to the response is the trick on the last line

User · Answer

I tried all variants of end  close  flush  and System Web HttpContext Current ApplicationInstance CompleteRequest   and none of them worked   Then I added the content length to the header  Response AddHeader  Content-Length   asset File Size ToString      In this example asset is a class that has a Int32 called File Size  This worked for me and nothing else did

User · Answer

The problem for me was that my stream was not set to the origin before download    Response Clear    Response ContentType    Application msword   Response AddHeader  Content-Disposition    attachment  filename myfile docx       ADDED THIS LINE myMemoryStream Seek 0 SeekOrigin Begin    myMemoryStream WriteTo Response OutputStream    Response Flush    Response Close

User · Answer

I had the same problem and the only solution that worked was   Response Clear    Response ContentType    Application msword   Response AddHeader  Content-Disposition    attachment  filename myfile docx    Response BinaryWrite myMemoryStream ToArray        myMemoryStream WriteTo Response OutputStream     works too Response Flush    Response Close    Response End

User · Answer

I had the same issue  try this  copy to MemoryStream -  delete file -  download   string absolutePath      your path   try         copy to MemoryStream     MemoryStream ms   new MemoryStream        using  FileStream fs   File OpenRead Server MapPath absolutePath                    fs CopyTo ms                 Delete file     if File Exists Server MapPath absolutePath           File Delete Server MapPath absolutePath          Download file     Response Clear       Response ContentType    image jpg       Response AddHeader  Content-Disposition    attachment filename       absolutePath              Response BinaryWrite ms ToArray      catch     Response End

User · Answer

Try with this  Response Clear    Response AppendHeader  Content-Type    application vnd openxmlformats-officedocument presentationml presentation    Response AppendHeader  Content-Disposition   string Format  attachment filename  0  pptx    getLegalFileName CurrentPresentation Presentation NM     Response Flush                    Response BinaryWrite masterPresentation ToArray     Response End

User · Answer

Instead of creating the PowerPoint presentation in a MemoryStream write it directly to the Response OutputStream  This way you don t need to be wasting any memory on the sever as the component will be directly streaming the output to the network socket stream  So instead of passing a MemoryStream to the function that is generating this presentation simply pass the Response OutputStream

[c#] Writing MemoryStream to Response Object

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