print class and child class in console

using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.MsmqIntegration;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ChildrenClassPrinter printer1 = new ChildrenClassPrinter(PrintBindingType);
            printer1.PrintChildrenClass(typeof(Binding));

            Console.WriteLine();

            ChildrenClassPrinter printer2 = new ChildrenClassPrinter();
            printer2.PrintChildrenClass(typeof(BindingElement));

            Console.ReadKey();
        }

        static void PrintBindingType(Type type)
        {

            if (type.IsAbstract || type.IsNested)
            {
                Console.ForegroundColor = ConsoleColor.DarkGray;
                Console.Write(type.Name);
                Console.ForegroundColor = ConsoleColor.Gray;
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Green;
                Console.Write(type.Name);
                Console.ForegroundColor = ConsoleColor.Gray;

                Binding binding = (Binding)Activator.CreateInstance(type, false);
                BindingElementCollection elements = binding.CreateBindingElements();

                Console.Write(" (");
                Console.Write(string.Join(", ", elements.Select(e => e.GetType().Name)));
                Console.Write(")");
            }

            Console.WriteLine();
        }
    }

    public class ChildrenClassPrinter
    {
        private const string horizontalLine = "-";
        private const string verticalLine = "¦";
        private const string space = "    ";
        private const string angle = "-";
        private Type[] types;

        private Action<Type> printType;

        public ChildrenClassPrinter() { }
        public ChildrenClassPrinter(Action<Type> printType)
        {
            this.printType = printType;
        }

        public void PrintChildrenClass(Type type, int level = 0)
        {
            if(types == null)
            {
                types = type.Assembly.GetTypes();
            }

            if (level > 0)
            {
                for (int i = 1; i < level; i  )
                {
                    Console.Write(verticalLine);
                    Console.Write(space);
                }

                Console.Write(angle);
                Console.Write(horizontalLine);
            }

            if (printType != null)
            {
                printType(type);
            }
            else
            {
                PrintCommonType(type);
            }

            foreach (var item in types)
            {
                if (item.BaseType == type)
                {
                    PrintChildrenClass(item, level   1);
                }
            }
        }

        private void PrintCommonType(Type type)
        {
            if (type.IsAbstract || type.IsNested)
            {
                Console.ForegroundColor = ConsoleColor.DarkGray;
                Console.Write(type.Name);
                Console.ForegroundColor = ConsoleColor.Gray;
            }
            else
            {
                Console.ForegroundColor = ConsoleColor.Green;
                Console.Write(type.Name);
                Console.ForegroundColor = ConsoleColor.Gray;
            }

            Console.WriteLine();
        }
    }
}