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我是新手，可能遗漏了一些明显的东西。创建新的“Flight”时，下拉列表返回值，例如“2”，而不是所需的文本，例如“Comm”。断点和监视验证“FlightType”和“ViewBag”是否包含正确的信息。任何建议都非常受欢迎。

型号：Flight.cs

public class Flight
{
    [Key]
    public int FlightID { get; set; }

    public int FlightTypeID { get; set; }
    public string FlightTypeEntry { get; set; }
}

型号：FlightType.cs

public class FlightType
{
[Key]
public int FlightTypeID { get; set; }
public string FlightTypeEntry { get; set; }
}

DAL：FlightInitializer.cs

var flighttypes = new List<FlightType
{
new FlightType { FlightTypeEntry = "Regular" },
new FlightType { FlightTypeEntry = "Comm" }
};
flighttypes.ForEach(e => context.FlightType.Add(e));
context.SaveChanges();

控制器：FlightController.cs

// GET: /Flight/Create
public ActionResult Create()
{
ViewBag.FlightVB = new SelectList(db.FlightType, "FlightTypeID",
    "FlightTypeEntry");
return View();
}

// POST: /Flight/Create
[HttpPost]
public ActionResult Create(Flight flight)
{
if (ModelState.IsValid)
  {
    db.Flight.Attach(flight);
    db.Entry(flight).State = EntityState.Modified;
    db.Flight.Add(flight);
    db.SaveChanges();
    return RedirectToAction("Index");
}

ViewBag.FlightTypeVB = new SelectList(db.FlightType, "FlightTypeID"
    "FlightTypeEntry");
return View(flight);

视图：Flight.Create.cshtml

<div class="editor-field">
  @Html.DropDownList(“FlightTypelID", <SelectList>)ViewBag.FlightTypeVB)
</div>
4

1 回答 1

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Create HttpPost 上的 Flight 对象可能没有正确填充 b/c 下拉列表只会返回所选项目的值 - 在您的情况下，该值是“FlightTypeID”。如果要更改它以返回文本值“FlightTypeEntry”，则可以更改

ViewBag.FlightVB = new SelectList(db.FlightType, "FlightTypeID", "FlightTypeEntry");

至

ViewBag.FlightVB = new SelectList(db.FlightType, "FlightTypeEntry", "FlightTypeEntry");

我不确定这会是一件好事。无论哪种方式，它都不会在回发时完全填充 Flight 对象。为此，您可能希望对输入的 flightID 使用隐藏字段，并找出与“FlightTypeValue”对应的“FlightTypeID”，反之亦然。

于 2013-04-07T20:39:37.827 回答