c#搭建服务端 简单中最高效的数据操作Linq (4)

.NET F 3.5之后提出的linq to sql 概念，大大的简化了对于数据对象的操作，可以通过简单的语法直接操作数据对象，如List，Linq to sql类 等等。

1.使用Linq to sql 类

2.Linq增删改查数据库

        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="u"></param>
        public void Add(user u)
        {
            using (AccountDataContext db = new AccountDataContext())
            {
                db.user.InsertOnSubmit(u);
                db.SubmitChanges();
            }
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="id"></param>
        public void Delete(int id)
        {
            using (AccountDataContext db = new AccountDataContext())
            {
                user channel = db.user.Single(c => c.uid == id);

                db.user.DeleteOnSubmit(channel);
                db.SubmitChanges();

            }
        }

       /// <summary>
        /// 修改
        /// </summary>
        /// <param name="id"></param>
        public void Update(int id)
        {
            using (AccountDataContext db = new AccountDataContext())
            {
                user u = db.user.Single(c => c.uid == id);
                u.name = "修改后的name";

                db.SubmitChanges();

            }
        }

       /// <summary>
        /// 查询
        /// </summary>
        public List<user> Select()
        {
            using (AccountDataContext db = new AccountDataContext())
            {
                IQueryable<user> u = from c in db.user
                                     select c;
                return u.ToList();
            }
        }