我希望有人可以帮助解决这个问题。我有三个这样的Model类:
public class Provider
{
public Guid ProviderId { get; set; }
public string Name { get; set; }
public Guid LocationId { get; set; }
public virtual Location Location { get; set; }
}
public class Location
{
public Guid LocationId { get; set; }
public string NameOrCode { get; set; }
public string Description { get; set; }
public string StreetNumber { get; set; }
public string StreetAddress1 { get; set; }
public string StreetAddress2 { get; set; }
public string City { get; set; }
public int? StateId { get; set; }
public string Zip { get; set; }
public string ContactPhone { get; set; }
public virtual State State { get; set; }
}
public class State
{
public int StateId { get; set; }
public string Name { get; set; }
public string Abbreviation { get; set; }
}
正如您所看到的,Provider有一个Location(单独的类可以在其他地方重用),而Location有一个State(在选中之前为null)。
对于我的Create方法,我的控制器看起来像这样:
public class ProviderController : BaseController
{
private SetupContext db = new SetupContext();
// other CRUD methods ...
//
// GET: /Provider/Create
public ActionResult Create()
{
Location location = new Location()
{
LocationId = Guid.NewGuid(),
NameOrCode = Resources.BillingLocation,
Description = Resources.BillingLocationDescription
};
Provider provider = new Provider()
{
ProviderId = Guid.NewGuid(),
LocationId = location.LocationId,
Location = location
};
ViewBag.StateId = new SelectList(db.States, "StateId", "Name", provider.Location.StateId);
return View(provider);
}
//
// POST: /Provider/Create
[HttpPost]
public ActionResult Create(Provider provider)
{
if (ModelState.IsValid)
{
db.Locations.Add(provider.Location);
db.Providers.Add(provider);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.StateId = new SelectList(db.States, "StateId", "Name", provider.Location.StateId);
return View(provider);
}
// other CRUD methods ...
}
最后,我的View看起来像这样:
<div class="editor-label">
@Html.LabelFor(model => model.Location.StateId, @Resources.Location_State_Display_Name)
</div>
<div class="editor-field">
@Html.DropDownList("StateId", @Resources.ChooseFromSelectPrompt)
@Html.ValidationMessageFor(model => model.Location.StateId)
</div>
我的问题是用户在DropDownList中选择的状态永远不会在Create POST上的Model上设置。我的编辑视图中有类似的代码,并且在该视图中正确填充了状态(即,与DropDownList中选择的现有Provider.Location相关联的状态,以便用户在需要时进行编辑),但是在创建和编辑视图用户所做的选择从未在我的模型(特别是来自POST的Provider.Location.StateId)中注册。
查看生成的HTML,我看到了:
<div class="editor-label">
<label for="Location_StateId">State/Territory</label>
</div>
<div class="editor-field">
<select id="StateId" name="StateId"><option value="">[Choose]</option>
<option value="1">Alabama</option>
<option value="2">Alaska</option>
<!-- more options ... -->
</select>
<span class="field-validation-valid" data-valmsg-for="Location.StateId" data-valmsg-replace="true"></span>
</div>
我怀疑我需要以某种方式传达Location.StateId关系,而不仅仅是我在上面看到的StateId,但我无法弄清楚这样做的正确语法。我已经尝试将ViewBag动态属性更改为Location_StateId,如下所示:
ViewBag.Location_StateId = new SelectList(db.States, "StateId", "Name", provider.Location.StateId);
我视图中的DropDownList如下:
@Html.DropDownList("Location_StateId", @Resources.ChooseFromSelectPrompt)
我想或许符号会起作用,因为我的DropDownList旁边的标签呈现为:
<div class="editor-label">
<label for="Location_StateId">State/Territory</label>
</div>
这种尝试不起作用。你能救我一下吗?
提前致谢。
答案 0 :(得分:1)
@Html.DropDownList("Location.StateId", @Resources.ChooseFromSelectPrompt)
以下行也没有用处:
ViewBag.StateId = new SelectList(db.States, "StateId", "Name", provider.Location.StateId);
您正在将SelectList分配给应该是标量属性的东西。您可能希望将该集合作为ViewBag传递:
ViewBag.States = new SelectList(db.States, "StateId", "Name", provider.Location.StateId);
然后在视图中:
@Html.DropDownList("Location.StateId", (SelectList)ViewBag.States)