using (var context = new leadmw2DbFirst())

            {

                //删除测试数据

                context.Database.ExecuteSqlCommand("delete MW_Goods where GoodsCode = '111111111111'");

                //行复制

                var goods = context.MW_Goods.Find("0111A1300");



                var goodsNew = (MW_Goods)context.Entry(goods).CurrentValues.Clone().ToObject();

                //修改主键

                goodsNew.GoodsCode = "111111111111";



                //复制Collection

                goodsNew.MW_GTagRegList = (ICollection<MW_GTagRegList>)goods.MW_GTagRegList.ToList();



                //保存

                context.MW_Goods.Add(goodsNew);

                context.SaveChanges();

            }