досье

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
using System.Dynamic;
using System.Globalization;
using System.Linq;
using System.Runtime.Serialization;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
namespace CSLight
{
    class Program
    {
        private static int index = 0;
        static void Main(string[] args)
        {
            //int index = 0;
            string[] menu = { "1. Добавить досье.", "2. Вывести досье.", "3. Удалить досье.", "4. Поиск по фамилии.", "5. Выход." };
            Console.CursorVisible = false;
            while(true)
            {
                string selectMenuItems = DrawMenu(menu);
                if(selectMenuItems == "1. Добавить досье.")
                {
                    Console.Clear();
                    Console.WriteLine("Привет!");
                    //Console.Read();
                }
                else if(selectMenuItems == "2. Вывести досье.")
                {

                }
                else if (selectMenuItems == "3. Удалить досье.")
                {

                }
                else if (selectMenuItems == "4. Поиск по фамилии.")
                {

                }
                else if (selectMenuItems == "5. Выход.")
                {
                    break;
                }
            }
        }
        static string DrawMenu(string[] items)
        {

            for (int i = 0; i < items.Length; i++)
            {
                if (i == index)
                {
                    Console.BackgroundColor = ConsoleColor.Gray;
                    Console.ForegroundColor = ConsoleColor.Black;
                    Console.WriteLine(items[i]);
                }
                else
                {
                    Console.WriteLine(items[i]);
                }
                Console.ResetColor();
            }
            ConsoleKeyInfo ckey = Console.ReadKey();
            if (ckey.Key == ConsoleKey.DownArrow)
            {
                if (index == items.Length - 1)
                {
                    index = 0;
                }
                else
                {
                    index++;
                }
            }
            else if (ckey.Key == ConsoleKey.UpArrow)
            {
                if (index <= 0)
                {
                    index = items.Length - 1;
                }
                else
                {
                    index--;
                }
            }
            else if (ckey.Key == ConsoleKey.Enter)
            {
                return items[index];
            }
            else
            {
                Console.Clear();
            }
            Console.Clear();
            return "";
        }
    }
}