Extension method on enumeration, not instance of enumeration

Question

I have an enumeration for my Things like so:

public enum Things
{
   OneThing,
   AnotherThing
}

I would like to write an extension method

Answer 1

Extension methods only work on instances, so it can't be done, but with some well-chosen class/method names and generics, you can produce a result that looks just as good:

public class SelectList
{
    // Normal SelectList properties/methods go here

    public static SelectList Of()
    {
        Type t = typeof(T);
        if (t.IsEnum)
        {
            var values = from Enum e in Enum.GetValues(type)
                         select new { ID = e, Name = e.ToString() };
            return new SelectList(values, "Id", "Name");
        }
        return null;
    }
}

Then you can get your select list like this:

var list = SelectList.Of();

IMO this reads a lot better than Things.ToSelectList().