ImportXML() public méthode

Deserialize XML of lectures.
The XML cannot be deserialized.
public ImportXML ( System.Web.HttpPostedFileBase file ) : List
file System.Web.HttpPostedFileBase File posted by HTTP POST.
Résultat List
        public ActionResult ImportFromXML(HttpPostedFileBase file)
        {
            ImportExport instance = new ImportExport();
            try
            {
                List<TimetableField> result;
                result = instance.ImportXML(file);
                M.CustomTimetableFields = result;
                SaveToSession();
            }
            catch (InvalidDataException ex)
            {
                ViewBag.ImportErrorMessage = ex.Message;
            }

            return View("Index", M);
        }