MVC 3 DropDownListFor ModelState.IsValid is False

Question

view .cshtml页面:

    @{var items = new SelectList(Model.Rooms, "RoomGUID", "FullName");}
    @Html.DropDownListFor(x => x.Request.Room, @items)

在ViewModel .cs页面中:

    public class NewRequestView
        {
            public IEnumerable<Room> Rooms { get; set; }
            public Request Request { get; set; }
        }

在控制器中。cs页面:

    NewRequestView nrv = new NewRequestView();
        nrv.Request = r;
        nrv.Rooms = db.Rooms;
        return View(nrv);

数据在ModelState.Value中。AttemptedValue，而不是ModelState。ISValid为false。任何想法?因为它返回的是GUID而不是对象。

Answer 1

通过将这行放在代码中并在其上设置断点，您可以在Watch窗口中获得验证错误列表:

var x = this.ModelState.Keys.SelectMany(key => this.ModelState[key].Errors);