Chain

Chain.cs

using System;

namespace Chain
{
    internal static class Program
    {
        private static void Main()
        {
            var ch = new ChildHairdresser();
            var wm = new WomenHairDresser();
            var mn = new MenHairDresser();

            var shop = new Shop(ch);
            shop.Add(wm);
            shop.Add(mn);

            shop.Handle(10);
            shop.Handle(20);
            shop.Handle(30);
        }
    }

    class Shop
    {
        private readonly IHairdresser _hairdresser;
        private IHairdresser _last;

        public Shop(IHairdresser hairdresser)
        {
            _hairdresser = hairdresser;
            _last = _hairdresser;
        }

        public void Add(IHairdresser hairdresser)
        {
            _last.SetNext(hairdresser);
            _last = _last.Next;
        }

        public void Handle(int value)
        {
            _hairdresser.Handle(value);
        }
    }

    public interface IHairdresser
    {
        IHairdresser Next { get; }
        void Handle(int value);
        void SetNext(IHairdresser hairdresser);
    }

    public class ChildHairdresser : IHairdresser
    {
        public IHairdresser Next { get; private set; }

        public void Handle(int value)
        {
            if (value > 0 && value <= 10)
            {
                Console.WriteLine("Child hair dresser invoked");
                return;
            }

            Next?.Handle(value);
        }

        public void SetNext(IHairdresser hairdresser)
        {
            Next = hairdresser;
        }
    }

    public class WomenHairDresser : IHairdresser
    {
        public IHairdresser Next { get; private set; }

        public void Handle(int value)
        {
            if (value > 10 && value <= 20)
            {
                Console.WriteLine("Women hair dresser invoked");
                return;
            }

            Next?.Handle(value);
        }

        public void SetNext(IHairdresser hairdresser)
        {
            Next = hairdresser;
        }
    }

    public class MenHairDresser : IHairdresser
    {
        public IHairdresser Next { get; private set; }

        public void Handle(int value)
        {
            if (value > 20 && value <= 30)
            {
                Console.WriteLine("Men hair dresser invoked");
                return;
            }

            Next?.Handle(value);
        }

        public void SetNext(IHairdresser hairdresser)
        {
            Next = hairdresser;
        }
    }
}