Question

Hi I’m unable to create a new object that is a subclass I think that’s what you call it it saying virtual isn’t allowed what must I do to correct this here is my code.

public class PagerBuilder {
    private virtual class PagerLink
    {
        public string Title { get; set;}
        public int PageNo { get; set; }
        public string Class { get;set;}
    }

    private readonly List<PagerLink> _pagerLinks = new List<PagerLink>();
    private readonly string _urlTemplate;
    public PagerBuilder(string urlTemplate)
    {
        _urlTemplate = urlTemplate;
    }

    public string PagerClass { get;set;}

    public void AddPage(string title, int pageNo)
    {
        AddPage(title, pageNo, string.Empty);
    }

    public void AddPage(string title, int pageNo, string itemClass)
    {
        PagerLink link = new PagerLink();

    }
}

Answer 1

First, I would move PagerLink outside of the PagerBuilder class and define it separately (in a new file as well).

Second, you don’t need virtual to subclass PagerLink (It’s not even valid, in fact). If you want it to be abstract, use the abstract keyword instead, but this code won’t compile (at PagerLink link = new PagerLink() until you define a concrete implementation of PagerLink. You don’t need to use abstract to inherit from PagerLink, though. Just do this:

public class CustomPagerLink: PagerLink
{
   //Subclass implementation
}