ViewModel to inherit more than one page type

Anusha Nagula

Vote:

I have a question page with two properties

public virtual XhtmlString Description { get; set; }
public virtual Url ButtonLink {get; set; }

I have an answer page with one property

public virtual ContentArea ContentAreaContent {get; set;}

Now I want to have a view with both answer and question page properties.

But how do I create a ViewModel inheriting both the page properties

Here is my ViewModel
public class AnswerViewModel : PageViewModelBase

{ public AnswerViewModel(Answers currentPage, ISettings siteSettings) : base(currentPage, siteSettings) {}
}
Controller

[HttpGet]

public ActionResult Index(Answers currentPage)

{

var model = new SAnswerViewModel(currentPage, SiteSettings);

return View(model);

}

View

@Html.PropertyFor(x => x.CurrentPage.SelfServiceContentArea)

The above process is working fine if I just inherit Answers into ViewModel. But I would also want to include the properties of Questions page as well.
What changes do I make to ViewModel, Controller and View to also include the Questions page?

#148705

May 20, 2016 16:46

valdis

Vote:

I would strongly recommend to rethink viewmodel structure in your project and avoid these cases - when you would need to inherit from more than 1 class - just because it's not supported at all in our .Net world.

Can you maybe give a try to so called composite view models, like:

public class MyNewViewModel
{
    public Answers AnswersPage { get; set; }
    public Questions QuesitonsPage { get; set; }
}

That would give opportunity to avoid necessaity for multiple inheritance.

#148708

May 20, 2016 17:14

Dejan Caric

Vote:

#148710

May 20, 2016 17:20

Tim Røgler

Vote:

You can add a reference to the question page in your answer view model:

public class AnswerViewModel : PageViewModelBase<Answers>
{
   public AnswerViewModel(Answers currentPage, ISettings siteSettings) : base(currentPage, siteSettings)
   {
   }
   public Questions QuesitonsPage { get; set; }
}

and populate the reference in the controller:
var model = new SAnswerViewModel(currentPage, SiteSettings);

model.QuestionsPage = <Code for getting the question page to this answer page>

#148767

May 23, 2016 15:50

Try our conversational search powered by Generative AI!

ViewModel to inherit more than one page type