ASP.NET - 三元运算符无法正常工作？

Question

我希望根据记录的存在来更改注册状态。但是，我当前的语法无法正常运行。我有一张应该显示的记录＆＃34;未注册＆＃34;作为一种状态，但它没有。它只会进入＆＃34;未注册＆＃34;状态。

其他信息：我尝试对三元运算符进行重组，它只适用于第一个运算符并忽略其间的条件。就像在我下面的代码中一样，它只适用于＃34;注册＆＃34;状态正确，其余的只有＆＃34;未注册＆＃34;完全忽略了其他两个条件。

以下是方法：

    // GET: Enrollment
    public ActionResult Enrollment()
    {
        //Query for Children
        var children = from x in db.child_t
                       select new ViewModels.ChildViewModel
                       {
                           child_id = x.child_id,
                           last_name = x.last_name,
                           first_name = x.first_name,
                           middle_name = x.middle_name,
                           ext_name = x.ext_name,
                           sex = x.sex,
                           birthdate = x.birthdate,
                           sibling_status = ((from s in db.sibling_t where (s.child_id == x.child_id) select s).Count() > 0),
                           child_survey_status = ((from cs in db.child_survey_t where (cs.child_id == x.child_id) select cs).Count() > 0),
                           parent_status = ((from tp in db.tn_child_parent_t where (tp.child_id == x.child_id) select tp).Count() > 0),
                           home_status = ((from h in db.home_t where (h.child_id == x.child_id) select h).Count() > 0),
                           enrollment_status =
                            (

                              (from h in db.tn_enrollment_t
                                where (h.child_id == x.child_id && h.enrollment_date != null && h.unenrollment_date == null && h.completed_date == null)
                                orderby h.enrollment_date descending
                                select h).FirstOrDefault() != null ? "Enrolled" :

                              (from h in db.tn_enrollment_t
                               where (h.child_id == x.child_id && h.enrollment_date != null && h.unenrollment_date != null && h.completed_date == null)
                               orderby h.enrollment_date descending
                               select h).FirstOrDefault() != null ? "Unenrolled" :

                              (from h in db.tn_enrollment_t
                               where (h.child_id == x.child_id && h.enrollment_date != null && h.unenrollment_date == null && h.completed_date != null)
                               orderby h.enrollment_date descending
                               select h).FirstOrDefault() != null ? "Completed" : 

                               "Not Enrolled"
                            ),
                           program_id =
                            ((from p in db.tn_enrollment_t
                                where (p.child_id == x.child_id)
                                orderby p.enrollment_date descending
                                select p.program_id).FirstOrDefault())
                       };

        return View(children.ToList());


    }

下图中的第一条记录应该是＆＃34;未注册＆＃34;状态已经。

为了清楚说明我的注册状态：