Why does Firefox trim the response file name? - asp.net-mvc-3

Question

The following code accesses a helper method which creates and returns an EPPlus ExcelPackage, then returns the package to the browser:
public ActionResult DownloadMatrixExcel(int projectId)
{
try
{
// Get project details
var project = (from p in db.Projects
where p.ProjectId == projectId
select new
{
companyName = p.Company.Name,
projectName = p.Name
}).Single();
// Must append file type to file download responses
var fileName = project.projectName + "-" + project.companyName + "-" + DateTime.Now.ToString("yyyyMMdd", CultureInfo.InvariantCulture) + ".xlsx";
// Configure response
Response.Clear();
Response.BufferOutput = false;
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
// Create and populate excel package
var matrixSpreadsheet = ExcelHelper.BuildMatrixExcel(projectId);
matrixSpreadsheet.SaveAs(Response.OutputStream);
}
catch (Exception e)
{
return Content("Error: " + e.Message);
}
// Download okay - No ViewResult
return new EmptyResult();
}
Works fine in every browser I have tested but FireFox 18.0.1 (have yet to test other FF versions) trims the file name at the first space, so "someproject - somecompany - thedate" is just "someproject". I can do a Replace and remove spaces but this makes some file names look a bit odd. File extension seems to be intact and no other issues but wondered if anyone could offer an explanation or fix?

Answer 1

You should place the filename between quote characters ("filename").

Answer 2

Okay, found the answer here while researching another issue: File Download issue in FireFox only
Response.AddHeader("Content-Disposition",
string.Format("attachment; filename = \"{0}\"",
System.IO.Path.GetFileName(FileName)));
This will also give the file the correct content type when you choose to save rather than open in browser in FireFox.