根据模型生成数据库

SchoolContainer schoolEF = new SchoolContainer();
            //Student s = new Student();
            //s.Username = "李";
            //s.Sex = "男";
            //Student s2 = new Student();
            //s2.Username = "成功";
            //s2.Sex = "女";
            //往上下文集合加数据
            //schoolEF.Student.AddObject(s);
            //schoolEF.Student.AddObject(s2);

            //schoolEF.SaveChanges();

            var item = (from h in schoolEF.Student
                       where h.Id == 1
                       select h).SingleOrDefault<Student>();

            if (item != null)
            {
                schoolEF.Student.DeleteObject(item);
            }
            Console.WriteLine(item.Username);

            var item1 = schoolEF.Student.Where<Student>(s => s.Id == 2).SingleOrDefault<Student>();

            Console.WriteLine(item1.Username);

                // IQueryable类型，不会把所有数据放入内存，在SQL Server Profiler可以看到生成的是select top ....语句
            var item = (from h in schoolEF.Student
                        orderby h.Id
                        select h).Skip<Student>(1).Take<Student>(1);//跳过1个，取几个

            foreach (var item1 in item)
            {
                Console.WriteLine(item1.Username);
            }

            //先转换成IEnumerable,所有数据放入内存,在SQL Server Profiler可以看到生成的是select 所有列, ....语句
            var item2 = (from h in schoolEF.Student
                         orderby h.Id
                         select h).AsEnumerable<Student>().Skip<Student>(1).Take<Student>(2);

            foreach (var item3 in item2)
            {
                Console.WriteLine(item3.Username);
            }