c# - 将 linq to objects 查询结果放入类型化字典中

Question

对 LINQ 还是有点陌生​​。似乎应该有一种更优雅的方法来使用 ToDictionary 来执行此操作，但无法弄清楚。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);