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Код

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

namespace LabaAnnechki
{
    class ConsoleInterface
    {
        private void AddObject()
        {
            //
        }

        private void ShowContent()
        {
            //
        }

        private void ClearContent()
        {
            //
        }

        private int PrintMenu()
        {
            Console.WriteLine("\n\t === МЕНЮ ===");
            Console.WriteLine("\t[1] Добавить объект.");
            Console.WriteLine("\t[2] Вывести содержимое.");
            Console.WriteLine("\t[3] Очистить содержание");
            Console.WriteLine("\t[4] закончить программу");
            
            Console.Write("\nВаш выбор: ");
            
            int result;
            string choice = Console.ReadLine();

            if (! int.TryParse(choice, out result))
                PrintMenu();

            return result;
        }

        public void Run()
        {
            bool terminate = false;

            while (!terminate)
            {
                int val = PrintMenu();

                switch (val)
                {
                    case 1:
                        AddObject();
                        break;
                    
                    case 2:
                        ShowContent();
                        break;
                    
                    case 3:
                        ClearContent();
                        break;

                    case 4:
                        terminate = true;
                        break;
                }
            }
        }
    }


    class Program
    {
        static void Main(string[] args)
        {
            ConsoleInterface console = new ConsoleInterface();
            console.Run();

            Console.Write("\npress any key to continue...");
            Console.ReadLine();
        }
    }
}