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Question

我遇到了关于MVC下拉列表的问题。我搜索过并搜索过但无济于事。

我的ViewModel

public class IncidentFormViewModel
{
    public Guid Guid { get; set; }

    public Incident Incident { get; set; }

    public Guid PersonInvolvedId { get; set; }

    public IEnumerable<Person> People { get; set; }
}

我的控制器

public ActionResult New()
{
    var incidentFormVM = new IncidentFormViewModel
    {
        Incident = new Incident(),
        People = unitofwork.Person.GetAll()
    };            
    return View("IncidentForm", incidentFormVM);
}

和查看（我已经取出了无用的信息）

@using (Html.BeginForm("Save", "Incident"))

<div class="container">
    <div class="row">
        <div class="col-sm-6">
            <div class="form-group">
                @Html.LabelFor(m => m.Incident.PersonInvolved)
                @Html.DropDownListFor(m => m.PersonInvolvedId, new SelectList(Model.People, "Id", "FirstName"), new { @class = "form-control" })
                @Html.ValidationMessageFor(m => m.Incident.PersonInvolved)
            </div>
        </div>
        <br />

        <button type="submit" class="btn btn-primary">Submit</button>
    </div>
</div>

问题是，如果我在下面的线上停下来，并在Model.People上观看我可以看到反对它的人员名单。

@Html.DropDownListFor(m => m.PersonInvolvedId, new SelectList(Model.People, "Id", "FirstName"), new { @class = "form-control" })

我做错了什么？