gistfile1.txt

using System;
using System.Collections.Generic;

namespace ConsoleApp31
{
    internal class Program
    {
        static void Main(string[] args)
        {
            const string CommandAddPlayer = "1";
            const string CommandRemovePlayer = "2";
            const string CommandBanPlayer = "3";
            const string CommandUnbanPlayer = "4";
            const string CommandShowAllPlayers = "5";
            const string CommandExit = "6";

            Database dataBase = new Database();
            
            bool isWorking = true;

            Console.WriteLine($"{CommandAddPlayer}) Добавить игрока");
            Console.WriteLine($"{CommandRemovePlayer}) Удалить игрока");
            Console.WriteLine($"{CommandBanPlayer}) Забанить игрока");
            Console.WriteLine($"{CommandUnbanPlayer}) Разбанить игрока");
            Console.WriteLine($"{CommandShowAllPlayers}) Показать всех игроков");
            Console.WriteLine($"{CommandExit}) Завершить работу");

            while (isWorking)
            {
                Console.Write("\nВведите номер команды: ");

                switch (Console.ReadLine())
                {
                    case CommandAddPlayer:
                        dataBase.AddPlayer();
                        break;

                    case CommandRemovePlayer:
                        dataBase.RemovePlayerById();
                        break;

                    case CommandBanPlayer:
                        dataBase.BanPlayer();
                        break;

                    case CommandUnbanPlayer:
                        dataBase.UnbanPlayer();
                        break;

                    case CommandShowAllPlayers:
                        dataBase.ShowAllPlayers();
                        break;

                    case CommandExit:
                        isWorking = false;
                        break;

                    default:
                        Console.WriteLine("Неверный формат команды");
                        break;
                }
            }
        }
    }

    class Database
    {
        private Dictionary<int, Player> _players = new Dictionary<int, Player>();

        public void AddPlayer()
        {
            if(TryGetPlayer(out Player player, out string message, out int id))
            {
                Console.WriteLine(message);
            }
            else
            {
                Console.Write($"\nВведите никнейм: ");

                string nickname = Console.ReadLine();
                Console.Write($"\nВведите уровень: ");
                string input = Console.ReadLine();

                if (int.TryParse(input, out int level) == false)
                {
                    Console.WriteLine("Вы ввели неверный формат уровня");
                    return;
                }
                
                player = new Player(id, nickname, level);

                _players.Add(id, player);
            }    
        }

        public void RemovePlayerById()
        {
            if (TryGetPlayer(out Player player, out string message, out int id))
            {
                _players.Remove(id);
            }
            else
            {
                Console.WriteLine("Игрока с таким ID не найдено");
            }  
        }

        public void BanPlayer()
        {
            if (TryGetPlayer(out Player player, out string message, out int id))
            {
                _players[id].Ban();
                Console.WriteLine($"Игрок {id} забанен");
            }
            else
            {
                Console.WriteLine("Игрока с таким ID не найдено");
            }
        }

        public void UnbanPlayer()
        {
            if (TryGetPlayer(out Player player, out string message, out int id))
            {
                _players[id].Unban();
                Console.WriteLine($"Игрок {id} разабанен");
            }
            else
            {
                Console.WriteLine("Игрока с таким ID не найдено");
            }
        }

        public void ShowAllPlayers()
        {
            if (_players.Count > 0)
            {
                foreach (var player in _players)
                {
                    Console.Write($"Игрок {player.Key} \n" +
                                      $"Никнейм: {player.Value.Nickname} \n" +
                                      $"Урвоень: {player.Value.Level} \n");
                    if (player.Value.isBanned == false)
                    {
                        Console.WriteLine("ЗАБАНЕН!!!\n");
                    }
                    else
                    {
                        Console.WriteLine("");
                    }
                }
            }
            else
            {
                Console.WriteLine("База игроков пока что пуста");
            }
        }

        private bool TryGetPlayer(out Player player, out string message, out int id)
        {
            Console.Write($"\nВведите ID: ");
            string input = Console.ReadLine();

            if (int.TryParse(input, out id) == false)
            {
                message = "Вы ввели неверный формат id";
                player = null;
                return false;
            }

            if (_players.ContainsKey(id))
            {
                message = "Игрок с таким ID уже существует";
                player = _players[id];
                return true;
            }
            else
            {
                message = "";
                player = null;
                return false;
            }
        }
    }

    class Player
    {
        public Player(int id, string nickname, int level)
        {
            Id = id;
            Nickname = nickname;
            Level = level;
            IsBanned = true;
        }

        public int Id { get; private set; }
        public string Nickname { get; private set; }
        public int Level { get; private set; }
        public bool IsBanned { get; private set; }

        public void Ban()
        {
            IsBanned = true;
        }

        public void Unban()
        {
            IsBanned = false;
        }
    }
}