designPatternGuru/DesignPatternGuru/ChainOfResponsibility/Client.cs

using ChainOfResponsibility.COR;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ChainOfResponsibility
{
    internal class Client
    {
        public static void ClientCode(AbstractHandler handler)
        {
            List<string> foods = new List<string>()
            {
                "Nut",
                "Banana",
                "Cup of coffee",
                "MeatBall"
            };

            foreach (string food in foods)
            {
                Console.WriteLine($"Client: Who wants a {food}");
                var result = handler.Handle(food);
                if (result == null)
                    Console.WriteLine($"    {food} was left untouched");
                else
                    Console.WriteLine($"    {result}");
            }
        }
    }
}