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贪吃蛇小时候大家都玩过，具体步骤如下:
1.给游戏制造一个有限得空间。
2.生成墙壁，小蛇碰撞到墙壁或者咬到自己的尾巴，游戏结束。
3.生成随机的食物。
4.吃掉食物，增加自身的体长，并生成新的食物。

具体代码如下：
定义一个小蛇类，该类包含吃东西，移动，检测碰撞等方法。

class Snake
{private List<Point> _body;private Direction _direction;private int _step = 1;private Point _tail;public Snake(Point tail, int length, Direction direction){_direction = direction;_body = new List<Point>();for (int i = 0; i < length; i++){Point p = new Point(tail.X, tail.Y, tail.Symbol);p.Move(i, _direction);_body.Add(p);}_tail = _body.First();}public void Move(){Point head = GetNextPoint();_body.Add(head);_tail.Clear();_tail = _body.First();_body.RemoveAt(0);head.Draw();}public bool Eat(Point food){Point head = GetNextPoint();if (head.IsHit(food)){food.Symbol = head.Symbol;_body.Add(food);return true;}return false;}public void HandleKey(ConsoleKey key){if (key == ConsoleKey.LeftArrow && _direction != Direction.Right){_direction = Direction.Left;}else if (key == ConsoleKey.RightArrow && _direction != Direction.Left){_direction = Direction.Right;}else if (key == ConsoleKey.UpArrow && _direction != Direction.Down){_direction = Direction.Up;}else if (key == ConsoleKey.DownArrow && _direction != Direction.Up){_direction = Direction.Down;}}public Point GetNextPoint(){Point head = _body.Last();Point nextPoint = new Point(head.X, head.Y, head.Symbol);nextPoint.Move(_step, _direction);return nextPoint;}public void Draw(){foreach (Point p in _body){p.Draw();}}public bool IsHitTail(){Point head = _body.Last();for (int i = 0; i < _body.Count - 2; i++){if (head.IsHit(_body[i])){return true;}}return false;}
}

定义一个墙体类：

class Walls
{private List<Point> _wallList;public Walls(int mapWidth, int mapHeight){_wallList = new List<Point>();DrawHorizontalLine(0);DrawHorizontalLine(mapHeight - 1);DrawVerticalLine(0);DrawVerticalLine(mapWidth - 1);}private void DrawHorizontalLine(int y){for (int x = 0; x < Console.WindowWidth; x++){Point p = new Point(x, y, '#');p.Draw();_wallList.Add(p);}}private void DrawVerticalLine(int x){for (int y = 0; y < Console.WindowHeight; y++){Point p = new Point(x, y, '#');p.Draw();_wallList.Add(p);}}public bool IsHit(Snake snake){Point head = snake.GetNextPoint();return IsHit(head);}private bool IsHit(Point p){return _wallList.Any(w => w.IsHit(p));}public void Draw(){foreach (Point p in _wallList){p.Draw();}}
}

定义一个创建食物类：

class FoodCreator
{private readonly int _mapWidth;private readonly int _mapHeight;private readonly char _symbol;public FoodCreator(int mapWidth, int mapHeight, char symbol){_mapWidth = mapWidth;_mapHeight = mapHeight;_symbol = symbol;}public Point CreateFood(){int x = new Random().Next(2, _mapWidth - 2);int y = new Random().Next(2, _mapHeight - 2);return new Point(x, y, _symbol);}
}

定义一个枚举，表示方向：

enum Direction
{Left,Right,Up,Down
}

定义一个坐标类应用重绘：

class Point
{public int X { get; set; }public int Y { get; set; }public char Symbol { get; set; }public Point(int x, int y, char symbol){X = x;Y = y;Symbol = symbol;}public void Draw(){Console.SetCursorPosition(X, Y);Console.Write(Symbol);}public void Clear(){Symbol = ' ';Draw();}public void Move(int offset, Direction direction){if (direction == Direction.Right){X += offset;}else if (direction == Direction.Left){X -= offset;}else if (direction == Direction.Up){Y -= offset;}else if (direction == Direction.Down){Y += offset;}}public bool IsHit(Point p){return p.X == X && p.Y == Y;}
}

函数入口：

class Program
{static void Main(){Console.Title = "贪吃蛇游戏";Console.CursorVisible = false;Console.SetWindowSize(40, 20);Console.SetBufferSize(40, 20);Walls walls = new Walls(40, 20);walls.Draw();Snake snake = new Snake(new Point(6, 5, '*'),1,Direction.Down);snake.Draw();FoodCreator foodCreator = new FoodCreator(40, 20, '$');Point food = foodCreator.CreateFood();food.Draw();while (true){if (walls.IsHit(snake) || snake.IsHitTail()){break;}if (snake.Eat(food)){food = foodCreator.CreateFood();food.Draw();}else{snake.Move();}System.Threading.Thread.Sleep(100);if (Console.KeyAvailable){ConsoleKeyInfo key = Console.ReadKey();snake.HandleKey(key.Key);}}WriteGameOver();Console.ReadLine();}static void WriteGameOver(){int xOffset = 10;int yOffset = 8;Console.ForegroundColor = ConsoleColor.Red;Console.SetCursorPosition(xOffset, yOffset++);WriteText("========", xOffset, yOffset++);WriteText("GAME OVER", xOffset + 1, yOffset++);yOffset++;WriteText("========", xOffset, yOffset++);}static void WriteText(String text, int xOffset, int yOffset){Console.SetCursorPosition(xOffset, yOffset);Console.WriteLine(text);}
}

运行效果图：