用c#写一个五子棋程序

以下是一个简单的五子棋程序的C#代码示例：

using System;

namespace FiveInARow
{
    class Program
    {
        static int ROWS = 15;
        static int COLS = 15;
        static char[,] board = new char[ROWS, COLS];

        static void Main(string[] args)
        {
            InitializeBoard();
            PrintBoard();

            char player = 'X';
            bool gameOver = false;

            while (!gameOver)
            {
                Console.WriteLine("Player " + player + "'s turn:");
                Console.Write("Enter row number (1-" + ROWS + "): ");
                int row = Convert.ToInt32(Console.ReadLine()) - 1;
                Console.Write("Enter column number (1-" + COLS + "): ");
                int col = Convert.ToInt32(Console.ReadLine()) - 1;

                if (IsValidMove(row, col))
                {
                    PlacePiece(row, col, player);

                    if (IsWinningMove(row, col))
                    {
                        Console.WriteLine("Player " + player + " wins!");
                        gameOver = true;
                    }
                    else if (IsBoardFull())
                    {
                        Console.WriteLine("It's a tie!");
                        gameOver = true;
                    }
                    else
                    {
                        player = (player == 'X') ? 'O' : 'X';
                        PrintBoard();
                    }
                }
                else
                {
                    Console.WriteLine("Invalid move. Please try again.");
                }
            }

            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }

        static void InitializeBoard()
        {
            for (int row = 0; row < ROWS; row++)
            {
                for (int col = 0; col < COLS; col++)
                {
                    board[row, col] = '-';
                }
            }
        }

        static void PrintBoard()
        {
            Console.WriteLine();
            for (int row = 0; row < ROWS; row++)
            {
                for (int col = 0; col < COLS; col++)
                {
                    Console.Write(board[row, col] + " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }

        static bool IsValidMove(int row, int col)
        {
            if (row < 0 || row >= ROWS || col < 0 || col >= COLS)
            {
                return false;
            }

            return board[row, col] == '-';
        }

        static void PlacePiece(int row, int col, char player)
        {
            board[row, col] = player;
        }

        static bool IsWinningMove(int row, int col)
        {
            char player = board[row, col];

            // check horizontal
            int count = 1;
            int c = col - 1;
            while (c >= 0 && board[row, c] == player)
            {
                count++;
                c--;
            }
            c = col + 1;
            while (c < COLS && board[row, c] == player)
            {
                count++;
                c++;
            }
            if (count >= 5)
            {
                return true;
            }

            // check vertical
            count = 1;
            int r = row - 1;
            while (r >= 0 && board[r, col] == player)
            {
                count++;
                r--;
            }
            r = row + 1;
            while (r < ROWS && board[r, col] == player)
            {
                count++;
                r++;
            }
            if (count >= 5)
            {
                return true;
            }

            // check diagonal 1
            count = 1;
            r = row - 1;
            c = col - 1;
            while (r >= 0 && c >= 0 && board[r, c] == player)
            {
                count++;
                r--;
                c--;
            }
            r = row + 1;
            c = col + 1;
            while (r < ROWS && c < COLS && board[r, c] == player)
            {
                count++;
                r++;
                c++;
            }
            if (count >= 5)
            {
                return true;
            }

            // check diagonal 2
            count = 1;
            r = row - 1;
            c = col + 1;
            while (r >= 0 && c < COLS && board[r, c] == player)
            {
                count++;
                r--;
                c++;
            }
            r = row + 1;
            c = col - 1;
            while (r < ROWS && c >= 0 && board[r, c] == player)
            {
                count++;
                r++;
                c--;
            }
            if (count >= 5)
            {
                return true;
            }

            return false;
        }

        static bool IsBoardFull()
        {
            for (int row = 0; row < ROWS; row++)
            {
                for (int col = 0; col < COLS; col++)
                {
                    if (board[row, col] == '-')
                    {
                        return false;
                    }
                }
            }
            return true;
        }
    }
}

这个程序使用一个二维字符数组来表示棋盘，使用 `-` 表示空位置，使用 `X` 和 `O` 表示两个玩家。程序使用一个循环来不断让两个玩家交替下棋，直到出现胜利或平局为止。在每个回合中，程序会让当前玩家输入一个位置来下棋，然后检查该位置是否有效，如果是，就下棋并检查是否出现胜利或平局。如果没有出现胜利或平局，则切换到另一个玩家，然后打印棋盘以供下一个回合使用。如果出现胜利或平局，程序将退出循环并显示相应的消息。