MVC 3 Razor模型未更新：“模型”不包含“ PropertyName”的定义

Question

Very simple MVC application, with one model, one loosely typed view and controller sending List<Model> to the view through ViewBag .

All was working fine until I updated the model. Now I get 'Model' does not contain a definition for 'PropertyName', Tried rebuilding the application and cleaning the temp folder.

What do I need to clean up to get this recompiled properly?

~Edit : Property that cannot be found was added to the Model not removed. And I'm trying to use this new property in the View.

~Edit : Model:

public class App
{
    public String title { get; set; }
    public String featured { get; set; }
    public String subtitle { get; set; }
    public String thumb { get; set; }
    public String logo { get; set; }
    public String web { get; set; }
    public String email { get; set; }
    public String phone { get; set; }
    public String download { get; set; }
    public String body { get; set; }
    public List<String> tags { get; set; }
    public List<String> features { get; set; }
    public List<Highlight> highlights { get; set; }
}

Controller:

ViewBag.apps = (from xml in XmlResources.Root.Descendants("app")
                        select new App
                        {
                            title = xml.Element("title").Value,
                            featured = xml.Attribute("featured").Value,
                            subtitle = xml.Element("subtile").Value,
                            thumb = xml.Element("thumb").Value,
                            logo = xml.Element("logo").Value,
                            web = xml.Element("web").Value,
                            email = xml.Element("email").Value,
                            phone = xml.Element("phone").Value,
                            download = xml.Element("download").Value,
                            body = xml.Element("body").Value,
                            tags = (from x in xml.Descendants("tag") select x.Value).ToList(),
                            features = (from x in xml.Descendants("feature") select x.Value).ToList(),
                            highlights = (from x in xml.Descendants("highlight") select new Highlight { type = x.Attribute("type").Value, src = x.Attribute("src").Value }).ToList()
                        }).ToList();

View:

@using eduApps.Models;
 @for (var i = 0; i < ViewBag.apps.Count; i++)
 {
  @{ if(!String.IsNullOrEmpty(ViewBag.apps[i].web))
                   {
                        <span>Web:</span><a href="@ViewBag.apps[i].web" title="@ViewBag.apps[i].title">@ViewBag.apps[i].web</a>
                    }
  }
}

Error: 'eduApps.Models.App' does not contain a definition for 'web'

Answer 1

Try casting to your class (ViewBag.apps[i] as eduApps.Models.App) when using it, as there is no strong typing here MVC will see your ViewBag.apps[i] simply as an object and not an App which indeed won't contain any of your defined properties:

@{ 
    if(!String.IsNullOrEmpty((ViewBag.apps[i] as App).web))
    {
        <span>Web:</span><a href="@(ViewBag.apps[i] as App).web" title="@(ViewBag.apps[i] as App).title">@(ViewBag.apps[i] as App).web</a>
    }
}

I don't know where your App class definition is located so you'll have to replace Namespace. with the appropriate name space, or add a using directive to your name space at the top of your view.

EDIT - sorry just noticed you've already added a using to your view of eduApps.Models . I've amended my answer.

Answer 2

What I don't understand is why u use ViewBag instead of Model.

Your ControllerMethod should look like:

public ActionResult Foo(){

   IList<App> model = 
   (from xml in XmlResources.Root.Descendants("app")
                    select new App
                    {
                        title = xml.Element("title").Value,
                        featured = xml.Attribute("featured").Value,
                        subtitle = xml.Element("subtile").Value,
                        thumb = xml.Element("thumb").Value,
                        logo = xml.Element("logo").Value,
                        web = xml.Element("web").Value,
                        email = xml.Element("email").Value,
                        phone = xml.Element("phone").Value,
                        download = xml.Element("download").Value,
                        body = xml.Element("body").Value,
                        tags = (from x in xml.Descendants("tag") select x.Value).ToList(),
                        features = (from x in xml.Descendants("feature") select x.Value).ToList(),
                        highlights = (from x in xml.Descendants("highlight") select new Highlight { type = x.Attribute("type").Value, src = x.Attribute("src").Value }).ToList()
                    }).ToList();


   return View(model);
}

And your view should do the following;

 @model IList<App>
 @foreach(App app in Model){
     @{ if(!String.IsNullOrEmpty(app.web))
        {
           <span>Web:</span><a href="@app.web" title="@app.title">@app.web</a>
        }
     }
 }

Hth Tobi