MVC - form upload exception handling

Question

I have a controller method which returns response to download. It is working fine but when there is an exception occurs a blank page returned on the current page, where download is requested.

Also I am sending some form data to request the download.

Instead I need to show the error message as popup. How could I do that?

MVC Controller Method to download pdf. Its return pdf to download but sometimes when exception occurs it return a blank page.

  [HttpPost]
  public void Downloadpdf()
  {
      try
      {
        // Generate pdf
            Response.Clear();
            Response.AddHeader("Content-Type", "application/pdf");
            Response.AddHeader("Content-Disposition", "attachment;filename=Newpdf.pdf");
            byte[] pdf = ms.ToArray();
            Response.OutputStream.Write(pdf, 0, pdf.Length);
            Response.End();

       }
       catch (Exception ex)
       {
           Response.End();
       }
   }

How should I show popup for the exception. And avoid blank page. Also it is a Single Page Application.

You can redirect to another controller by passing exception object as model from catch block. And from that controller you can render respective view notifying user about the error. — Rumit Parakhiya
– Rumit Parakhiya, Commented Jan 6, 2014 at 5:10
Actually i need to show the error in a popup window in the same page where i request(submit form) for download. @Rumit Parakhiya — Purushoth
– Purushoth, Commented Jan 6, 2014 at 5:31

vipul_surana · Accepted Answer · 2014-01-06 05:33:01Z

1

1) Remove void and use ActionResult

2) Use "return View("YourViewName");" after catch statement

3) In catch, add a line: ViewBag.Exception = ex;

4) On the view where you return, type

@if(ViewBag.Exception == null)
{
}
else
{
@ViewBag.Exception
}

5) You want to show on popup, use alert on the same view using javascript.

Hope the points satisfy your problem.

answered Jan 6, 2014 at 5:33

vipul_surana

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1 Comment

Purushoth Over a year ago

Its a single Page Application where routing is done in router.js(#tag routing), so i could not able to return a view.

chenZ · Accepted Answer · 2014-01-06 06:07:41Z

0

in you main page,put a iframe 0 width 0 height
when click download button ,set the iframe src to you download action
if everything is ok,return File(...)
if has some error ,return View(...)
and the view show in iframe,you can use some js to control the main page in iframe page to popup

main page

function pop(){....}

iframe page

$(function(){ window.parent.pop(); });

answered Jan 6, 2014 at 6:07

chenZ

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