主表插入一条记录，取出主表的记录主键，赋值给予从表多条记录使用

public void CreateWorkOrdGrid(Pp_WorkOrd_Hd headObject, List<Pp_WorkOrd_Dt> bodyObject)
        {
            //方式一
            using (var transction = project.Database.BeginTransaction())
            {
                project.Pp_WorkOrd_Hd.Add(headObject);
                foreach (Pp_WorkOrd_Dt a in bodyObject)
                {
                    a.Pp_WorkOrd_Hd = headObject;
                    project.Pp_WorkOrd_Dt.Add(a);
                }
                project.SaveChanges();
                transction.Commit();
            }
            //方式二
            using (var scope = new TransactionScope())
            {
                project.Pp_WorkOrd_Hd.Add(headObject);
                project.SaveChanges();
                foreach (Pp_WorkOrd_Dt a in bodyObject)
                {
                    a.Pp_WorkOrd_Hd = headObject;
                    project.Pp_WorkOrd_Dt.Add(a);
                }
                project.SaveChanges();
                scope.Complete();
            }
    }