使用 List<> 对象嵌套元素格式返回 JSON 结果

Question

我的列表对象是我从 dbcontext 身份模型中提取的线性数据行。问题是 JSON 结构需要返回包含在嵌套参数中的值。见例子。我如何实现这一目标？ child 中的数据不需要是单独的模型类定义，因为数据只需要在结果中以某种方式定义到接受的 javascript 客户端库。

以下代码从控制器的 JSON 结果返回。

using (var dc = new EntitiesDB.CalendarEntities())
{
  var evt1 = (from e in dc.CalendarEvents(startDate, endDate)
             select new
              {
                 e.EventID,
                 e.Subject,
                 e.startDateRecur,
                 e.startTimeRecur,
         e.Ruletype,
         e.RuleValue                           
}).ToList();

   return Json(evt1.Select(v => new
   {
      id = v.EventID,
      title = v.Subject,
      startRecur = v.startDateRecur,                    
      startTime = v.startTimeRecur,
      ruleType = v.RuleType,
      ruleValue = v.RuleValue
   }), JsonRequestBehavior.AllowGet);

[{
"id":222044,
"title":"Sample Day Recur Event 1",
"startRecur":"1/1/2019",                    
"startTime":"00:12:00",
"ruleType":"Weekly",
"ruleValue" = "True"
},
{
"id":222045,
"title":"Sample Day Recur Event 2",
"startRecur":"1/1/2019",                    
"startTime":"00:15:00",
"ruleType":"Weekly",
"ruleValue" = "True"
}]

如何让它返回结果，以便我可以将一些值放入嵌套元素“rrule”中的结果中？

[{
"id":222044,
"title":"Sample Day Recur Event 1",
"startRecur":"1/1/2019",                    
"startTime":"00:12:00",
rrule: { 
         "ruleType":"Weekly",
         "ruleValue" = "True"
       }
},
{
"id":222045,
"title":"Sample Day Recur Event 2",
"startRecur":"1/1/2019",                    
"startTime":"00:15:00",
rrule: { 
         "ruleType":"Weekly",
         "ruleValue" = "True"
       }
}]

Answer 1

您将使用如下的对象初始化器语法为 rrule 投射一个新类型：

return Json(evt1.Select(v => new
   {
      id = v.EventID,
      title = v.Subject,
      startRecur = v.startDateRecur,                    
      startTime = v.startTimeRecur,
      rrule = new { 
          ruleType = v.RuleType,
          ruleValue = v.RuleValue
      }
   }