After executing this code:
var runtime = IronRuby.Ruby.CreateRuntime();
var engine = IronRuby.Ruby.CreateEngine();
var scrope = engine.CreateScope();
engine.ExecuteFile("libtest.rb");
How can I get all the methods of a ruby class in c# code?
Or you can do it from C# http://github.com/casualjim/ironrubymvc/blob/master/IronRubyMvc/Core/RubyEngine.cs#L178
If you define methods without having them in a class they should get added to the Object class