You can use the ParentLink to get the parent.

http://world.episerver.com/Documentation/Class-library/?documentId=cms/7.5/b38e303b-a955-4dc6-4bd0-d954c4815ea2

Once you have the parent you can check if that has the property and if not, get its parent etc.

Thanks, I was aware of this solution too, but I hoped there was a more "Built-in"-way to do it. I mean, it's a pretty common thing to do in most of the projects I am developing.

Well, I guess i have to make my own recursive function that runs all the way up to the top level until it finds a page where the property is filled out.

The other way is using Dynamic properties, but I guess this is not what you want to do.

http://world.episerver.com/Documentation/Items/Developers-Guide/EPiServer-CMS/75/Content/Properties/Properties/

Thanks,

I will look more into the concept of Dynamic properties, but I guess I will go for the custom function to retreive the property recursively.

Hi Rasmus!

As Toni mentions, currently the built in solution for this is dynamic properties. However, we want to replace these with built in properties with inherritance support since dynamic properties use an old editing system and lack typed model support. Unfortunately, we have not had time to do this yet, so for now, I would probably add a helper method that resursively goes to the parents to find the closest defined value.

Here's an example of an extension method for that:

    public static class ContentDataExtensions
    {

        public static T GetPropertyValueRecursive<T>(this ContentData contentData, string propertyName)
        {            
            var val = contentData.GetPropertyValue(propertyName, default (T));            
            if (val != null || PageEditing.PageIsInEditMode) 
                return val; 

            // get parent content data
            var contentLoader = ServiceLocator.Current.GetInstance<IContentLoader>();
            var parent = contentLoader.Get<ContentData>(((IContent) contentData).ParentLink);

            if (parent == null) // this must be the root page, return null or whatever
                return default(T);

            return parent.GetPropertyValueRecursive<T>(propertyName);
        }
    }

Here's another way of doing this that I made. Maybe not effecient since it uses reflection, but it's typed and pretty cool;

public static TValue GetPropertyValueFromAncestor<TPageType, TValue>(this PageData page, Expression<Func<TPageType, TValue>> expression) where TPageType : PageData
{
    var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();
    while (page.ParentLink != null && page.ParentLink != PageReference.EmptyReference)
    {
        var typedPage = page as TPageType;
        if (typedPage != null)
        {
            var expr = (MemberExpression)expression.Body;
            var prop = (PropertyInfo)expr.Member;
            var value = prop.GetValue(typedPage, null);

            if (value != null)
            {
                return (TValue)value;
            }
        }
        page = contentRepository.Get<PageData>(page.ParentLink);
    }
    return default(TValue);
}

Usage:

currentPage.GetPropertyValueFromAncestor<NewsListingPageBase, ContentReference>(i => i.NewsContainer);

Cheers
Fredrik