PlayersDataBase

using System;
using System.Collections.Generic;

namespace CSLight
{
    class PlayersDataBase
    {
        private List<Player> _players;

        public PlayersDataBase(List<Player> players)
        {
            _players = players;
        }

        public void AddPlayer(Player newPlayer)
        {
            _players.Add(newPlayer);
        }

        public void DeletePlayer(Player player)
        {
            _players.Remove(player);
        }

        public void DeletePlayer(string name)
        {
            int index = _players.FindIndex(pl =>
                string.Equals(pl.Name, name, StringComparison.CurrentCultureIgnoreCase));
            if (index == -1)
                throw new ArgumentException("Неверное имя игрока");
            _players.RemoveAt(index);
        }

        public void GiveBan(int playerNumber)
        {
            Player player = _players.Find(pl => pl.Number == playerNumber);
            player.GiveBan();
        }

        public void CancelBan(int playerNumber)
        {
            Player player = _players.Find(pl => pl.Number == playerNumber);
            player.CancelBan();
        }
    }

    class Player
    {
        private static int _ids;

        public int Number { get; }
        public string Name { get; }
        public int Level { get; private set; }
        public bool HasBan { get; private set; }

        public Player(string name, int level = 1, bool hasBan = false)
        {
            Number = ++_ids;
            Name = name;
            Level = level;
            HasBan = hasBan;
        }

        public void GiveBan()
        {
            HasBan = true;
        }

        public void CancelBan()
        {
            HasBan = false;
        }
    }
}