二段Linq Groupby操作

var messages = list.GroupBy(p=>p.RefOrderNo,(k,v)=> new {OrderNo = k,SkuInfo = v})          .Select(p =>          {            var item = p.SkuInfo.FirstOrDefault();            return new ReplaceLabelSkuMessage            {              OrderNo = p.OrderNo,              Operation = new WMS.Message.Operation              {                Operator = item.CreateBy,                OperateTime = item.CreateOn              },              ReplaceLabelSkuDetail = p.SkuInfo.Select(s => new ReplaceLabelSkuDetail              {                SKU = s.SKU,                Weight = s.Weight,                Lenght = s.Lenght,                Width = s.Width,                Height = s.Height              }).ToList()            };                      });

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原标题：二段Linq Groupby操作

关键词：linq