EF增删改查操作

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Model1Container m = new Model1Container();
            Student s = new Student();
            s.Name = "小明";
            m.Student集.AddObject(s);   //增加操作
            m.SaveChanges();            //运行增加
            Console.WriteLine("增加成功");

            var Slist = from Stu in m.Student集 select Stu;   //查询操作
            foreach (Student sl in Slist)
            {
                Console.WriteLine("输出的学生名字为:");
                Console.WriteLine(sl.Name);
            }

            Console.WriteLine("更新操作");
            Student sc = new Student();
            sc.ID = 2;
            sc.Name = "小改明";
            m.Student集.Attach(sc);   //这句很重要把要更新的实体写入实体集中
            m.ObjectStateManager.ChangeObjectState(sc, System.Data.EntityState.Modified);   //对实体进行更新
            m.SaveChanges();   //运行更新操作

            Console.WriteLine("删除操作");
            Student sd = new Student();
            sd.ID = 3;
            m.Student集.Attach(sd);
            m.ObjectStateManager.ChangeObjectState(sd, System.Data.EntityState.Deleted);  //删除操作
            m.SaveChanges();
        }
    }
}