List nested types

ListNestedTypes.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace CsConsole
{
    class MainClass
    {
        static void WalkTypes(IEnumerable<Type> types, Action<Type> action) {
            foreach (var nested in types)
                action(nested);
        }

        static void PrintNestedTypesOfNonGeneric(System.Reflection.Assembly assembly) {
            Action<Type> visitor;
            visitor =  (type) => {
                    if (type.Namespace != null && type.Namespace.StartsWith("Mono."))
                        return;
                    if (type.IsGenericType)
                        return;

                    var allNested = from nested in type.GetNestedTypes()
                                    where ! nested.IsEnum && nested.IsNestedPublic
                                    select nested;

                    foreach (var nested in allNested)
                        Console.WriteLine(nested);
                    WalkTypes(allNested, visitor);
                };

            WalkTypes(assembly.GetTypes(), visitor);
        }

        public static void Main (string[] args)
        {
            var mscorlib = System.Reflection.Assembly.Load("mscorlib");
            var sys = System.Reflection.Assembly.Load("System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");

            foreach (var assembly in new [] {mscorlib, sys})
                PrintNestedTypesOfNonGeneric(assembly);
        }
    }
}

Small bug: it is not checking the nested types for other nested types :)

@leppie, See update. Over-engineering for the win. Oh my. I should have used a combinator to declare the recursive lambda … ;-)