private static Board CreateInputBoard()

in Sudoku/Program.cs [46:69]

• 20 lines of code
• 5 McCabe index (conditional complexity)

    private static Board CreateInputBoard(string filePath)
    {
      var boardData = new int[9][];
      using var reader = File.OpenText(filePath);
      for (var i = 0; i < 9; i++)
      {
        string line;
        do
        {
          line = reader.ReadLine();
        } while (!line?.Contains(",") ?? false);

        var numbers = line.Split(",")
          .Select(s => int.TryParse(s, out var value) ? value : NumberEx.Unknown)
          .ToArray();
        
        if (numbers.Length != 9)
          throw new ArgumentException("Invalid data format");

        boardData[i] = numbers;
      }

      return Board.CreateInitialBoard(boardData);
    }