How to get next (or previous) enum value in C#

Question

I have an enum which is defined like this:

public enum eRat { A = 0, B=3, C=5, D=8 };

So given value eRat.B, I want to get the

Answer 1

Probably a bit overkill, but:

eRat value = eRat.B;
eRat nextValue = Enum.GetValues(typeof(eRat)).Cast()
        .SkipWhile(e => e != value).Skip(1).First();

or if you want the first that is numerically bigger:

eRat nextValue = Enum.GetValues(typeof(eRat)).Cast()
        .First(e => (int)e > (int)value);

or for the next bigger numerically (doing the sort ourselves):

eRat nextValue = Enum.GetValues(typeof(eRat)).Cast()
        .Where(e => (int)e > (int)value).OrderBy(e => e).First();

Hey, with LINQ as your hammer, the world is full of nails ;-p