如何从外键关联表中获取数据列表是mvc中的json格式

Question

我创建了两个具有外键关联的表（问题、答案），我需要基于 questionID 列的答案列表，因为我需要 linq 查询。我是mvc的初学者，谁能帮帮我

控制器代码：

public JsonResult displayQuestion()
{
     var result = from q in Db.questions
                  join a in Db.answers on q.Qid equals a.questionID
                  select new { q.QText, q.Qid, a.answer1 };
     return Json(result, JsonRequestBehavior.AllowGet);
}

json 结果：

[
    {"QText":"result of 2+2","Qid":2,"answer1":"2"},
    {"QText":"result of 2+2","Qid":2,"answer1":"4"},
    {"QText":"result of 2+2","Qid":2,"answer1":"6"},
    {"QText":"result of 2+2","Qid":2,"answer1":"8"}
]

但我需要如下：

{
   "QText": "result of 2+2",
   "Qid": 2,
   "answer1": [
      { "option1": "2" },
      { "option1": "4" },
      { "option1": "6" },
      { "option‌​1": "8" }
   ]
}

Answer 1

不要进行连接，而是获取您想要的问题信息，然后执行子查询以获取特定问题的答案：

public JsonResult displayQuestion()
{
     var result = from q in Db.questions
                  select new { 
                    q.QText, 
                    q.Qid, 
                    answer1 = (from a in Db.answers 
                               where a.questionID == q.Qid
                               select new { option1 = a }).ToList()
                  };

     return Json(result, JsonRequestBehavior.AllowGet);
}