MVC3循环添加数据

 foreach (var item in orderdetails)

 {

  var billdetails = new BillDetail(){BillCode = billoflading.BillCode,StockId = item.StockId,PCS = item.PCS,CreateDate = DateTime.Now};

  _db.BillDetails.Add(billdetails);

 }

 _db.SaveChanges();