GroupBy 之后 OrderBy 并且返回指定对象,计数

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handlingUnit.PickExpandDetailsItems = handlingUnit.PickExpandDetailsItems
                                .GroupBy(p => p.MaterialId)
                                .Select( p => new PickExpandDetailsViewModel{
                                    MaterialId = p.Key,
                                    Description = p.First().Description,
                                    PickedQty = p.Sum(item => item.PickedQty),
                                    UoM = p.First().UoM
                                })
                                .OrderBy(d => d.Line).ToList();
                    handlingUnits.Add(handlingUnit);