I have spun up a new site and decided to use Umbraco 8. Previously I've used 7 and had a few partial views to do menus, breadcrumbs etc. I've been trying various things over the past couple of days and can't seem to get anywhere with this one.

In a previous Umbraco 7 I had a partial view that worked fine to produce a top menu. The first problem I hit was that it didn't like me using the following namespace:

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage

So I thought fine, I just go with a template one and notice it uses:

@inherits Umbraco.Web.Mvc.UmbracoViewPage
@using Umbraco.Web

I carried on customising the template an it works fine. Now I want to test if a simple tickbox has a value of true or not to be included in the array that comes as a default with that template. In my Umbraco 7 partial view, I have the following .Where("showInNavigation == True"), which no longer works. I tried including the @using Umbraco.Core.Models. The closet I have got so far is the following:

@{
    var selection = Model.Root()
    .Children
    .Where(x => (x.showInNavigation == "True"))
    .Where(x => x.IsVisible())
    .ToArray();
}

Sadly, this produces a CS1061: 'IPublishedContent' does not contain a definition for 'showInNavigation' and no accessible extension method 'showInNavigation' accepting a first argument of type 'IPublishedContent' could be found (are you missing a using directive or an assembly reference?)' (are you missing an assembly reference?) error. If someone could please shed some light onto what I'm doing wrong, that would be really great.

Thanks,

Tom