Sudoku.cs

using System;
using System.Collections.Generic;

namespace Sudoku_Solver
{
    class Sudoku
    {
        public const int SIZE = 81;
        private readonly object pLocker = new object();
        private readonly object vLocker = new object();

        private Field[] game = new Field[SIZE];

        public Sudoku(int[] init)
        {
            for (int i = 0; i < SIZE; i++)
            {
                game[i] = new Field();

                if (init[i] == 0)
                {
                    for (int j = 1; j < 10; j++)
                    {
                        game[i].AddPossibility(j);
                    }
                }
                else
                {
                    game[i].Value = init[i];
                }
            }
        }

        public int Get(int index)
        {
            return game[index].Value;
        }

        public Field GetField(int index)
        {
            return game[index];
        }

        public void Set(int index, int value)
        {
            lock (vLocker)
            {
                game[index].Value = value;
            }
        }

        public List<int> GetPossibilities(int index)
        {
            return game[index].GetPossibilities();
        }

        public void RemovePossibility(int index, int value)
        {

            lock (pLocker)
            {
                game[index].RemovePossibility(value);
            }
        }

        public void RemoveAllPossibilities(int index)
        {
            lock (pLocker)
            {
                game[index].RemoveAllPossibilities();
            }
        }

        public int IndexOf(Field other)
        {
            for (int i = 0; i < SIZE; i++)
            {
                if(game[i] == other)
                {
                    return i;
                }
            }

            return -1;
        }

        public void PrintSudoku()
        {
            string line = "";
            string separator = "";

            for (int i = 0; i < 38; i++)
            {
                separator += "-";
            }

            Console.WriteLine(separator);

            for (int i = 0; i < Sudoku.SIZE; i++)
            {
                if (i % 3 == 0)
                {
                    line += " | ";
                }

                line += " ";
                if (Get(i) == 0)
                {
                    line += "_";
                }
                else
                {
                    line += Get(i);
                }
                line += " ";

                if (i % 9 == 8)
                {
                    line += " | ";
                    Console.WriteLine(line);
                    line = "";
                }
                if (i % 27 == 26)
                {
                    Console.WriteLine(separator);
                }
            }
        }
    }
}