在数据库中存储值

Question

我需要在“StaffSectionInCharge”表中添加一些记录，它只有两列 StaffId 和 SectionId，我有 StaffId 和 StudentId 的值.....问题是我不能直接将记录添加到这个表.....我使用实体框架，这个表的设计是

[EdmRelationshipNavigationPropertyAttribute("Model", "StaffSectionInCharge", "Section")]
    public EntityCollection<Section> Sections
    {
        get
        {
            return ((IEntityWithRelationships)this).RelationshipManager.GetRelatedCollection<Section>("Model.StaffSectionInCharge", "Section");
        }
        set
        {
            if ((value != null))
            {
                ((IEntityWithRelationships)this).RelationshipManager.InitializeRelatedCollection<Section>("Model.StaffSectionInCharge", "Section", value);
            }
        }
    }

我需要通过 Staff 表访问这个表，我试过了

DataAccess.Staff staff = buDataEntities.Staffs.First(s=>s.StaffId==StaffId);
                staff.Sections.Add();

卡在这里，不能再往前走，谁能帮帮我

Answer 1

你可以试试：

Staff staff = buDataEntities.Staffs.First(s => s.StaffId == StaffId);
Section section = buDataEntities.Sections.First(s => s.SectionId == SectionId);

staff.Sections.Add(section);

buDataEntities.SaveChanges();

或者（不需要第二次查询数据库）：

Staff staff = buDataEntities.Staffs.First(s => s.StaffId == StaffId);

Section section = new Section { SectionId = SectionId };
buDataEntities.Sections.Attach(section);

staff.Sections.Add(section);

buDataEntities.SaveChanges();

或者（根本不需要对数据库进行任何查询）：

Staff staff = new Staff { StaffId = StaffId };
buDataEntities.Staffs.Attach(staff);

Section section = new Section { SectionId = SectionId };
buDataEntities.Sections.Attach(section);

staff.Sections.Add(section);

buDataEntities.SaveChanges();