下面是一个简单的示例，演示如何使用C#实现一个基本的五子棋游戏：

csharpCopy Codeusing System;namespace FiveInARow{    class Program    {        static char[,] board;        static bool isPlayer1Turn;        static void Main(string[] args)        {            InitializeBoard();            isPlayer1Turn = true;            while (true)            {                DrawBoard();                Console.WriteLine("请输入您要下棋的位置（例如：A1）：");                string input = Console.ReadLine().ToUpper();                if (input == "QUIT")                    break;                if (input.Length != 2 || !Char.IsLetter(input[0]) || !Char.IsDigit(input[1]))                {                    Console.WriteLine("无效的输入，请重新输入！");                    continue;                }                int row = input[1] - '1';                int col = input[0] - 'A';                if (row < 0 || row >= 15 || col < 0 || col >= 15 || board[row, col] != '-')                {                    Console.WriteLine("无效的位置，请重新输入！");                    continue;                }                board[row, col] = isPlayer1Turn ? 'X' : 'O';                if (CheckWin(row, col))                {                    DrawBoard();                    Console.WriteLine($"玩家{(isPlayer1Turn ? "1" : "2")}获胜！");                    break;                }                if (IsBoardFull())                {                    DrawBoard();                    Console.WriteLine("平局！");                    break;                }                isPlayer1Turn = !isPlayer1Turn;            }        }        static void InitializeBoard()        {            board = new char[15, 15];            for (int i = 0; i < 15; i++)            {                for (int j = 0; j < 15; j++)                {                    board[i, j] = '-';                }            }        }        static void DrawBoard()        {            Console.Clear();            Console.WriteLine("  A B C D E F G H I J K L M N O");            for (int i = 0; i < 15; i++)            {                Console.Write($"{i + 1} ");                for (int j = 0; j < 15; j++)                {                    Console.Write(board[i, j] + " ");                }                Console.WriteLine();            }        }        static bool CheckWin(int row, int col)        {            char symbol = board[row, col];            // 检查水平方向            int count = 1;            int left = col - 1;            while (left >= 0 && board[row, left] == symbol)            {                count++;                left--;            }            int right = col + 1;            while (right < 15 && board[row, right] == symbol)            {                count++;                right++;            }            if (count >= 5)                return true;            // 检查垂直方向            count = 1;            int up = row - 1;            while (up >= 0 && board[up, col] == symbol)            {                count++;                up--;            }            int down = row + 1;            while (down < 15 && board[down, col] == symbol)            {                count++;                down++;            }            if (count >= 5)                return true;            // 检查正斜方向            count = 1;            int topLeftRow = row - 1;            int topLeftCol = col - 1;            while (topLeftRow >= 0 && topLeftCol >= 0 && board[topLeftRow, topLeftCol] == symbol)            {                count++;                topLeftRow--;                topLeftCol--;            }            int bottomRightRow = row + 1;            int bottomRightCol = col + 1;            while (bottomRightRow < 15 && bottomRightCol < 15 && board[bottomRightRow, bottomRightCol] == symbol)            {                count++;                bottomRightRow++;                bottomRightCol++;            }            if (count >= 5)                return true;            // 检查反斜方向            count = 1;            int topRightRow = row - 1;            int topRightCol = col + 1;            while (topRightRow >= 0 && topRightCol < 15 && board[topRightRow, topRightCol] == symbol)            {                count++;                topRightRow--;                topRightCol++;            }            int bottomLeftRow = row + 1;            int bottomLeftCol = col - 1;            while (bottomLeftRow < 15 && bottomLeftCol >= 0 && board[bottomLeftRow, bottomLeftCol] == symbol)            {                count++;                bottomLeftRow++;                bottomLeftCol--;            }            if (count >= 5)                return true;            return false;        }        static bool IsBoardFull()        {            for (int i = 0; i < 15; i++)            {                for (int j = 0; j < 15; j++)                {                    if (board[i, j] == '-')                        return false;                }            }            return true;        }    }}

这个示例通过控制台界面实现了一个简单的五子棋游戏。玩家可以输入行列坐标进行下棋，输入"QUIT"结束游戏。程序会在每次下棋后检查是否有玩家获胜或者平局，并相应地输出结果。

请注意，这只是一个基础的实现示例，可能还需要添加更多的功能和优化来完善游戏体验。