Using a IList, how to populate it via a comma separated list of ID's

Question

I have a property IList CategoryIDs, and a private string variable that contains a comma separated list, how to elegantly populate the IList collection?

I asked earler and I learn a neat way of populating the List with .AddRange(...), but now I realized I have to have the property return IList which doesn't seem to support the .AddRange method.

Answer 1

public IList CategoryIDs
{
    get
    {
        return list.Split(',')
                .ToList<string>()
                .ConvertAll<int>(new Converter<string, int>(s => int.Parse(s)));
    }
}