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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();
}