Question

仍然是LINQ的新手。似乎应该有更优雅的方式使用ToDictionary来做到这一点，但无法弄明白。这是我要清理的代码：

 var EventOccurrencesMappedToPatientMeds = from pm in allPtMeds
      from e in thisUsersEventOccurrencesPlusEventData
      where e.EventContainer.Event.PatientMedId == pm.MedicationId
      select new ScheduleEventOccurrenceMedPair{ 
           PatientMedication = pm, 
           ScheduledEventOccurrence = e.EventOccurrence 
      };

 int evtOccCount = 1;
 foreach (var evtOcc in EventOccurrencesMappedToPatientMeds)
 {
      // EventOccurrenceChoices is a Dictionary of type <int, IScheduledEventOccurrenceMedPair>
      message.EventOccurrenceChoices.Add(evtOccCount,(ScheduleEventOccurrenceMedPair)evtOcc);
 }

Answer 1

您可以使用重载的Enumerable.Select method来包含索引，然后使用ToDictionary：

var dict = EventOccurrencesMappedToPatientMeds
               .Select((e, i) => new { Event = e, Index = i + 1 })
               .ToDictionary(o => o.Index,
                             o => (ScheduleEventOccurrenceMedPair)o.Event);

Answer 2

使用ToDictionary扩展方法。

这样的事情：

var i = 1;
var resultDictionary = (
    from pm in allPtMeds
    from e in thisUsersEventOccurrencesPlusEventData
    where e.EventContainer.Event.PatientMedId == pm.MedicationId
    select new ScheduleEventOccurrenceMedPair
    {
        PatientMedication = pm,
        ScheduledEventOccurrence = e.EventOccurrence
    })
    .ToDictionary(arg => i++, arg => arg);

将linq放入对象查询结果到一个打字的字典

2 个答案: