BusinessLogic.Logic.Players.PlayerDeleter.ValidatePlayer C# (CSharp) Метод

        private void ValidatePlayer(int playerId)
        {
            var playerToDelete = _dataContext.GetQueryable<Player>()
                .Include(p => p.PlayerGameResults)
                .FirstOrDefault(p => p.Id == playerId);

            if (playerToDelete == null)
            {
                throw new ArgumentException("Player not exists", nameof(playerId));
            }
            if (playerToDelete.PlayerGameResults.Any())
            {
                throw new Exception("You can not delete players with any played game");
            }
        }