c# - Duplicate headers and Calling the file in the wrong path

Question

I'm trying to create and showing a pdf from my webpage by clicking a link. But when the system has to show it goes something wrong.

When I use this command

return new FileStreamResult(fileStream, "application/pdf");

It shows a empty pdf file:

///C:/Users/Me/Downloads/C--Apps-MyWebSolution-MyWeb-Documenten-MyList_198721.pdf

It is saved as: C:AppsMyWebSolutionMyWebDocumentenMyList_198721%20.pdf

And when I use this command:

return File(fileStream, "application/pdf", fullFileName);

then I get an error message:

ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION

What am I doing wrong?

public FileStreamResult PDFGenerator(string html, string fileName)
{
    string fullFileName = Server.MapPath("~/Documenten/" + fileName + ".pdf");
    Stream fileStream = CreatePDF(html, fullFileName);

    HttpContext.Response.AddHeader("content-disposition", "attachment; filename=" + fullFileName);

    //return new FileStreamResult(fileStream, "application/pdf");
    return File(fileStream, "application/pdf", fullFileName);
}

If I had to post more. I'll do it. But I don't think it is needed.

Answer 1

Most likely you need to .Seek stream to the beginning (usually when you write to a file Position points to end/last written location).

Second issue is somewhat self explanatory as you set "content-disposition" header twice - manualy and via File(...).