Recursive List Flattening

Question

I could probably write this myself, but the specific way I\'m trying to accomplish it is throwing me off. I\'m trying to write a generic extension method similar to the oth

Answer 1

class PageViewModel { 
    public IEnumerable<PageViewModel> ChildrenPages { get; set; } 
}

Func<IEnumerable<PageViewModel>, IEnumerable<PageViewModel>> concatAll = null;
concatAll = list => list.SelectMany(l => l.ChildrenPages.Any() ? 
    concatAll(l.ChildrenPages).Union(new[] { l }) : new[] { l });

var allPages = concatAll(source).ToArray();