// 查询上下文中的所有学生 public static void Query() { using (EFTPTEntities context = new EFTPTEntities()) { var people = from p in context.People.OfType<Student>() select p; foreach (var s in people) { Console.WriteLine("{0} {1} Degree: {2}", s.LastName, s.FirstName, s.Degree); } } }
// 查询上下文中的所有学生 public static void Query() { using (EFTPTEntities context = new EFTPTEntities()) { var people = from p in context.People.OfType <Student>() select p; foreach (var s in people) { Console.WriteLine("{0} {1} Degree: {2}", s.LastName, s.FirstName, s.Degree); } } }