Question

当我尝试从表中删除记录时遇到了一些麻烦。我收到错误：

传递的主键值的数量必须与实体上定义的主键值的数量匹配。

该表具有复合主键。他们是cabinCrewId和flightId。

控制器：

public ActionResult Delete(string name)
    {
         using (A1Context db = new A1Context())
         {
             var id = from person in db.person
                      from flightcabincrew in db.flightcabincrew
                      from cabincrew in db.cabincrew
                      where person.name == name
                      where person.id == cabincrew.person
                      where cabincrew.person == flightcabincrew.cabinCrewId
                      select new { flightcabincrew.cabinCrewId, flightcabincrew.flightId };

             FlightCabinCrew fcc = db.flightcabincrew.Find(id);
             if (fcc == null)
             {
                 return HttpNotFound();
             }
             else
             {
                 return View(fcc);
             }
         }
    }

发表：

 [HttpPost]
    public ActionResult Delete(FlightCabinCrew fcc)
    {
        using (A1Context db = new A1Context())
        {
            db.Entry(fcc).State = System.Data.EntityState.Deleted;
            db.SaveChanges();
        }
        return View();
    }

和有关观点的一部分：

  @model IEnumerable<Assignment2.Models.FlightCrewGrid>
        @{
            WebGrid grid = new WebGrid(Model);
        }
        <h2>@ViewBag.Title</h2>
        @grid.GetHtml(columns: grid.Columns(
            grid.Column("PersonName", "Crew Member"),
            grid.Column("FlightDay", "Flight Day"),
            grid.Column("FromAirport", "From"),
            grid.Column("ToAirport", "To"),
            grid.Column("Model", "Model"),
            grid.Column("startDate", "Start Date"),
            grid.Column(header: "Delete", format: (item) => Html.ActionLink("Delete", "Delete", new { id=item.PersonName})))

提前感谢任何指导。

Answer 1

也许您没有为实体声明主键。您可以通过使用[Key]属性标记主键列来执行此操作。

[Key]
public int cabinCrewId { get; set; }

[Key]
public int flightId { get; set; }

Answer 2

public ActionResult Demodelete（int id）

    {
        Employee emptbl = new Employee();
        emptbl.EmpId = id;
        dbc.Entry(emptbl).State = EntityState.Deleted;
        dbc.SaveChanges();

        return View();
    }

删除表MVC 4中的记录

2 个答案: