Recursive call return a List, return type causing me issues

Question

I have a recursive method that is return me categories, and checking for its sub categories.

So it looks like:

public List GetAllChildCat         


        

Answer 1

I think this linq version will allow you to avoid the overhead of creating a list:

public IEnumerable GetAllChildCats(int categoryid)
{
    Category c = Get(categoryid);
    return new[] { c }.Concat(c.ChildCategories.SelectMany(cat => GetAllChildCats(cat)));
}

You can always call ToList() on the returned IEnumerable if you need it.