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单项选择题 You are implementing an ASP.NET application that uses LINQ to Entities to access and update the database.The application includes the following method to update a detached entity of type Person. You need to implement the UpdatePerson method to update the database row that corresponds to the personToEdit object. Which code segment should you use?()

A、_entities.People.Attach(personToEdit); _entities.ObjectStateManager.ChangeObjectState(personToEdit, EntityState.Modified); _entities.SaveChanges();

B、_entities.ObjectStateManager.ChangeObjectState(personToEdit, EntityState.Added);_entities.SaveChanges();

C、_entities.People.ApplyCurrentValues(personToEdit); _entities.SaveChanges();

D、_entities.People.Attach(new Person() { Id = personToEdit.Id });_entities.ObjectStateManager.ChangeObjectState(personToEdit, EntityState.Modified);_entities.SaveChanges();

  • A
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