MVC TO LINQ

        //

        // GET: /Home/

        TestTryEntities Db = new TestTryEntities();



        public ActionResult Index()

        {

            return View();

        }



        /// <summary>

        /// 查询

        /// </summary>

        /// <returns></returns>

        public ActionResult GetStudent()

        {

            int pageIndex = 1;//页码

            int pageSize = 10;//每页条数

            //var data = Db.Student.OrderBy(r => r.ID)

            //    .Skip(pageSize * (pageIndex - 1)).Take(pageSize)

            //    .Select(r => new { r.ID, r.Name, r.Password });



            var data1 = (from r in Db.Student

                         join t in Db.Class on r.ClassID equals t.ID

                         orderby r.ID

                         select new { r.ID, r.Name, r.Password, t.ClassName })

                         .Skip(pageSize * (pageIndex - 1)).Take(pageSize);



            int total = Db.Student.Count();//总条数

            //构造成Json的格式传递





            var result = new { total = total, rows = data1 };

            return Json(result, JsonRequestBehavior.AllowGet);

        }



        //添加

        public ActionResult Add()

        {

            var data = Db.Class.Select(r => new SelectListItem()

            {

                Text = r.ClassName,

                Value = SqlFunctions.StringConvert((double)r.ID)

            }).ToList();



            ViewData["Class"] = data;

            return View();



        }

        [HttpPost]

        public ActionResult Add(Model.Student model)

        {

            Db.Student.Add(model);

            Db.SaveChanges();

            return View("Index");

        }



        /// <summary>

        /// 修改

        /// </summary>

        /// <param name="ID"></param>

        /// <returns></returns>

        public ActionResult Edit(int ID)

        {

            var model = Db.Student.Where(r => r.ID == ID).Select(r => r).FirstOrDefault();

            ViewData["modelStudent"] = model;





            var data = Db.Class.Select(r => new SelectListItem()

            {

                Text = r.ClassName,

                Value = SqlFunctions.StringConvert((double)r.ID),

                Selected = (r.ID == model.ClassID)

            }).ToList();

            ViewData["Class"] = data;

            return View(model);

        }



        [HttpPost]

        public ActionResult Edit(Model.Student model)

        {

            Db.Student.Attach(model);

            Db.Entry<Student>(model).State = System.Data.EntityState.Modified;

            

            if (Db.SaveChanges() > 0)

            {

                return Content("OK");

            }

            else

            {

                return Content("修改失败");

            }

        }



        /// <summary>

        /// 删除

        /// </summary>

        /// <param name="ID"></param>

        /// <returns></returns>

        public ActionResult Delete(int ID)

        {

            //var model = Db.Student.Where(r => r.ID == ID).Select(r => r).FirstOrDefault();

            //if (model == null)

            //{

            //  return Script("alert('验证失败！)");

            //  return View("Index");

            //}

            //Db.Student.Remove(model);

            //Db.SaveChanges();



            var model1 = new Model.Student() { ID = ID };

            if (model1 == null)

            {

                return View("Index");

            }

            Db.Student.Attach(model1);

            Db.Entry<Student>(model1).State = System.Data.EntityState.Deleted;

            Db.SaveChanges();



            return View("Index");

        }



        public ActionResult AddMulti()

        {





            return View();

        }



        [HttpPost]

        public ActionResult AddMulti(Mvctry.Models.ClassStudent model)

        {





            return View();

        }

    }