Question

我有一个EF存储过程（函数导入），它返回一个结果集，我希望该结果集分组在多个级别上。有没有一种简单的方法可以将结果分组到一个新对象中？

我的结果集包含具有以下数据的对象：

CategoryId
EventId
EventInstanceId
Name
DueDate

我想按类别和活动对结果进行分组，因此我最终得到Category.List<Event>.List<EventInstances>

class Category
{
    List<Event> Events;
}

class Event
{
    List<EventInstance> Instances;
}

Answer 1

好吧，我打算删除我的问题，因为我发现了，但是因为有一个向上投票，我会发布我发现的解决方案

List<CategoryModel> list =
    (from category in context.GetEvents(date, date) // Stored Procedure
        group category by category.CategoryId 
        into groupedByCategory // Group by Category
        select new CategoryModel
        {
            CategoryId = groupedByCategory.Key,
            Events = new ObservableCollection<EventModel>
            (
                from evt in groupedByCategory
                group evt by new { evt.EventId, evt.AssignedUserId, evt.EventName, evt.EventDescription, evt.IsRecurring } 
                into groupedByEvent // Sub-Group for Events
                select new EventModel
                {
                    EventId = groupedByCategory.Key,
                    AssignedUserId = groupedByEvent.Key.AssignedUserId,
                    EventDescription = groupedByEvent.Key.EventDescription,
                    EventName = groupedByEvent.Key.EventName,
                    IsRecurring = groupedByEvent.Key.IsRecurring,
                    Instances = new ObservableCollection<EventInstanceModel>
                        (
                            from item in groupedByEvent
                                select new EventInstanceModel
                                {
                                    CompletedDate = item.CompletedDate,
                                    CompletedUserId = item.CompletedUserId,
                                    DueDate = item.DueDate,
                                    EventInstanceId = item.EventInstanceId,
                                    IsSkipped = item.IsSkipped.GetValueOrDefault()
                                }
                        )
                }
            )
        }
    ).ToList();

有没有简单的方法将EF ResultSet分组到新对象中？

1 个答案: