ASP.NET-EF基础知识

(IObjectContextAdapter)this).ObjectContext.ExecuteFunction("sp_alterdiagram", diagramnameParameter, owner_idParameter, versionParameter, definitionParameter);
        }

            ///<summary>
            /// 使用EF的ORM框架来对数据库进行增删改查
            /// 
            /// </summary>
            SQLtestEntities sqlentity = new SQLtestEntities();
            //增加行
            Eftest eft1 = new Eftest() { ID = 3, name = "spike", password = "123", ds = "xiaolizi" };
            sqlentity.Eftest.Add(eft1);
            sqlentity.SaveChanges();
            //查找行
            var cc = sqlentity.Eftest.Select(s => s).Where(s => s.name == "spike");
            foreach (var item in cc)
            {
                Console.WriteLine(item.ID + "  " + item.name + "  " + item.password + "  " + item.ds);
            }
            sqlentity.SaveChanges();
            //删除行
            var eft4 = sqlentity.Eftest.Where(s => s.ID == 2).Select(s => s);
            sqlentity.Eftest.Remove(eft4.FirstOrDefault());
            var eft5 = sqlentity.Eftest.Where(s => s.name == "spike").Select(s => s);
            sqlentity.Eftest.RemoveRange(eft5);
            sqlentity.SaveChanges();
            //更改行
            var eft6 = sqlentity.Eftest.Where(s => s.name == "spike").Select(s => s);
            Eftest eft7 =  (Eftest)eft6.FirstOrDefault();
           // eft7.ID = 10;    // 这句是错误的，KEY的值不能修改，这就话搞不明白为什么
            eft7.name = "spike";
            eft7.password = "ji11";
            eft7.ds = "this is a test for you ,my lover!";
            sqlentity.SaveChanges();
            Console.ReadKey();