[R#] implicitly captured closure - fixed

            Ensure.Argument.NotNull(template);

            var accountStateCode = UserBase.GetAccountStateCode(template.QueueAccountState);
            var since = DateTime.Today.AddDays(-template.QueueDays);

            var users = _userRepo.AllIncluding(u => u.SentEmails)
                                 .Where(u => u.AccountStateCode == accountStateCode
                                          && u is Customer
                                          && !u.SentEmails.Select(s => s.EmailTemplateId).Contains(template.Id));

            switch (template.QueueAfter)
            {
                case QueueAfter.RegistrationDate:
                    users = users.Where(ud => ud.RegisteredOn <= since);
                    break;
                default:
                    throw new Exception("Geen QueueAfter ingevuld.");
            }

            return users.Select(user => user as Customer).ToList();