EF 第一个demo

 //直接删除

 KSBMB k1028 = new KSBMB() { KSBM = "1028"};
           z1.Entry<KSBMB>(k1028).State = System.Data.Entity.EntityState.Deleted;
            z1.SaveChanges();

//  必须dbcontext  上下文中有  才能删除 也就必须要查询 才能删除

KSBMB k1 = new KSBMB();
            zkhisEntities z1 = new zkhisEntities();
            List<KSBMB> list = z1.KSBMB.Where(u => true).ToList();
            var ks = from u in z1.KSBMB where u.KSBM == "1028" select u;
            KSBMB k028 = ks.FirstOrDefault();

            z1.KSBMB.Remove(k028);
            z1.SaveChanges();