C# 返回特定格式的json Web API，Linq

我需要帮助创建json。我有两个模型，即问题库和问题选项。 QUESTIONOPTIONS包含QUESTIONBANK中问题的多个选项

public partial class QUESTIONBANK
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public QUESTIONBANK()
        {
            this.QUESTIONOPTIONS = new HashSet<QUESTIONOPTION>();
        }

        public int QID { get; set; }
        public string QUESTION { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<QUESTIONOPTION> QUESTIONOPTIONS { get; set; }
    }

  public partial class QUESTIONOPTION
    {
        public int OPTIONID { get; set; }
        public Nullable<int> QID { get; set; }
        public string OPTIONTEXT { get; set; }
        public Nullable<bool> ISANSWER { get; set; }

        public virtual QUESTIONBANK QUESTIONBANK { get; set; }
    }

我得到的json如下所示

[
  {
    "q": "Accounting provides information on",
    "a": "False",
    "options": "Cost and income for managers"
  },
  {
    "q": "Accounting provides information on",
    "a": "False",
    "options": " Companys tax liability for a particular year"
  },
  {
    "q": "Accounting provides information on",
    "a": "False",
    "options": "Financial conditions of an institution"
  },
  {
    "q": "Accounting provides information on",
    "a": "True",
    "options": " All of the above"
  },
  {
    "q": "The long term assets that have no physical existence but are rights that have value is known as",
    "a": "False",
    "options": "Current assets"
  },
  {
    "q": "The long term assets that have no physical existence but are rights that have value is known as",
    "a": "False",
    "options": "Fixed assets"
  },
  {
    "q": "The long term assets that have no physical existence but are rights that have value is known as",
    "a": "True",
    "options": "Intangible assets"
  },
  {
    "q": "The long term assets that have no physical existence but are rights that have value is known as",
    "a": "False",
    "options": "Investments"
  },
  {
    "q": "The assets that can be converted into cash within a short period (i.e. 1 year or less) are known as",
    "a": "True",
    "options": "Current assets"
  },
  {
    "q": "The assets that can be converted into cash within a short period (i.e. 1 year or less) are known as",
    "a": "False",
    "options": " Fixed assets"
  },
  {
    "q": "The assets that can be converted into cash within a short period (i.e. 1 year or less) are known as",
    "a": "False",
    "options": "Intangible assets"
  },
  {
    "q": "The assets that can be converted into cash within a short period (i.e. 1 year or less) are known as",
    "a": "False",
    "options": "Investments"
  },
  {
    "q": "Patents, Copyrights and Trademarks are",
    "a": "False",
    "options": " Current assets"
  },
  {
    "q": "Patents, Copyrights and Trademarks are",
    "a": "False",
    "options": " Fixed assets"
  },
  {
    "q": "Patents, Copyrights and Trademarks are",
    "a": "True",
    "options": "Intangible assets"
  },
  {
    "q": "Patents, Copyrights and Trademarks are",
    "a": "False",
    "options": "Investments"
  },
  {
    "q": "The following is not a type of liability",
    "a": "True",
    "options": "Short term"
  },
  {
    "q": "The following is not a type of liability",
    "a": "False",
    "options": "Current"
  },
  {
    "q": "The following is not a type of liability",
    "a": "False",
    "options": "Fixed"
  },
  {
    "q": "The following is not a type of liability",
    "a": "False",
    "options": "Contingent"
  }
]

然而，我需要以下格式的json，其中问题选项需要以逗号分隔的形式检索，并且ISANSWER的标记为true的选项应该是“a”

quizData:{
“问题”：[{
“q”：“查看以下选择器：$（\“div\”）
它选择了什么？”，
“a”：“所有div元素”，
“选择”：[
“所有div元素”，
“第一个div元素”，
类为“div”的所有元素
]
}, {
“q”：“以下哪项是正确的”，
“a”：“jQuery是一个JavaScript库”，
“选择”：[
“jQuery是一个JSON库”，
“jQuery是一个JavaScript库”
]
}, {
“q”：“jQuery使用CSS选择器选择元素？”，
“a”：“正确”，
“选择”：[
“真的”，
“假”
]
}, {
“q”：“jQuery使用哪个符号作为jQuery的快捷方式？”，
“a”：“美元符号”，
“选择”：[
“%符号”，
“美元符号”，
“标志”
]
}, {
“q”：“jQuery是客户端脚本库还是服务器脚本库？”，
“a”：“客户端脚本编写”，
“选择”：[
“客户端脚本”，
“服务器脚本”，
]
}]
}

---

非常感谢你的帮助。提前感谢

您可以聚合数据库中的结果，并将其包装为匿名类型

var aggr = qSet.GroupBy(x => x.q)
               .Select(t => new { 
                              q = t.Key, 
                              a = t.FirstOrDefault(ans => ans.a == "True").options, 
                              options = t.Select(ans => ans.options).ToList() });

var result = new { quizData = new { questions = aggr }};
return Request.CreateResponse(HttpStatusCode.OK, result);

---

您可以聚合数据库中的结果，并将其包装为匿名类型

var aggr = qSet.GroupBy(x => x.q)
               .Select(t => new { 
                              q = t.Key, 
                              a = t.FirstOrDefault(ans => ans.a == "True").options, 
                              options = t.Select(ans => ans.options).ToList() });

var result = new { quizData = new { questions = aggr }};
return Request.CreateResponse(HttpStatusCode.OK, result);

---

首先，这与Web API、JSON甚至EntityFramwork无关

您有一个逻辑错误，该错误在针对内存中集合的查询中以完全相同的方式显示，并且从未序列化

输出正是预期的结果

然而，修正很容易

下面的内容将实现此目的

public IEnumerable<QuestionViewModel> GetQUESTIONBANKs()
{
    return from question in db.QUESTIONBANKs
                join option in db.QUESTIONOPTIONS
                on question.ID equals option.QID
                into questonOptions
                select new QuestionViewModel
                {
                    Q = question.QUESTION,
                    A = questionOptions.First(o => o.ISANSWER).OPTIONTEXT,
                    Options = from o in questionOptions select o.OPTIONTEXT
                };
      }

---

首先，这与Web API、JSON甚至EntityFramwork无关

您有一个逻辑错误，该错误在针对内存中集合的查询中以完全相同的方式显示，并且从未序列化

输出正是预期的结果

然而，修正很容易

下面的内容将实现此目的

public IEnumerable<QuestionViewModel> GetQUESTIONBANKs()
{
    return from question in db.QUESTIONBANKs
                join option in db.QUESTIONOPTIONS
                on question.ID equals option.QID
                into questonOptions
                select new QuestionViewModel
                {
                    Q = question.QUESTION,
                    A = questionOptions.First(o => o.ISANSWER).OPTIONTEXT,
                    Options = from o in questionOptions select o.OPTIONTEXT
                };
      }

---

您是否尝试过使用自定义Json输出格式化程序？使您能够更好地控制如何显示输出对象=>基本上可以转换为json（或xml/其他格式）您可以使用LINQ group by clauseTake从数据库中复制条目并在C中按它们分组#我不确定是否使用实体框架进行分组，但熟悉存储过程~您是否尝试过使用自定义Json输出格式化程序？让您能够更好地控制如何显示输出对象=>您基本上可以转换为您想要的json（或xml/其他格式）使用LINQ group by clauseTake可以从DB中复制条目，并在C中按它们分组35;我不确定是否要使用实体框架，但熟悉存储过程~No，我的意思是A应该包含正确答案选项，不是真或假否，我的意思是A应该包含正确答案选项，不是真或假

from question in db.QUESTIONBANKs
select new QuestionViewModel
{
    Q = question.QUESTION,
    A =questionOptions.First(o => o.ISANSWER).OPTIONTEXT,    
    Options = from o in questionOptions select o.OPTIONTEXT
}