ChessDotNet.Pieces.Bishop.GetValidMoves C# (CSharp) 메소드

        public override ReadOnlyCollection<Move> GetValidMoves(Position from, bool returnIfAny, ChessGame game, Func<Move, bool> gameMoveValidator)
        {
            List<Move> validMoves = new List<Move>();
            Piece piece = game.GetPieceAt(from);
            int l0 = game.BoardHeight;
            int l1 = game.BoardWidth;
            for (int i = -7; i < 8; i++)
            {
                if (i == 0)
                    continue;
                if (from.Rank + i > 0 && from.Rank + i <= l0
                    && (int)from.File + i > -1 && (int)from.File + i < l1)
                {
                    Move move = new Move(from, new Position(from.File + i, from.Rank + i), piece.Owner);
                    if (gameMoveValidator(move))
                    {
                        validMoves.Add(move);
                        if (returnIfAny)
                            return new ReadOnlyCollection<Move>(validMoves);
                    }
                }
                if (from.Rank - i > 0 && from.Rank - i <= l0
                    && (int)from.File + i > -1 && (int)from.File + i < l1)
                {
                    Move move = new Move(from, new Position(from.File + i, from.Rank - i), piece.Owner);
                    if (gameMoveValidator(move))
                    {
                        validMoves.Add(move);
                        if (returnIfAny)
                            return new ReadOnlyCollection<Move>(validMoves);
                    }
                }
            }
            return new ReadOnlyCollection<Move>(validMoves);
        }
    }