用C#写一个贪吃蛇游戏

好的，以下是一个简单的贪吃蛇游戏的C#代码：

using System;
using System.Collections.Generic;

namespace SnakeGame
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.CursorVisible = false;
            Console.SetWindowSize(40, 20);

            // 初始化蛇的起始位置
            List<Position> snake = new List<Position>()
            {
                new Position(20, 10),
                new Position(19, 10),
                new Position(18, 10)
            };

            // 初始化食物位置
            Position food = new Position();
            Random random = new Random();
            food.X = random.Next(0, Console.WindowWidth);
            food.Y = random.Next(0, Console.WindowHeight);

            // 初始化移动方向
            Direction direction = Direction.Right;

            // 游戏开始
            while (true)
            {
                Console.Clear();

                // 绘制蛇和食物
                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.SetCursorPosition(food.X, food.Y);
                Console.Write("$");

                Console.ForegroundColor = ConsoleColor.Green;
                foreach (Position p in snake)
                {
                    Console.SetCursorPosition(p.X, p.Y);
                    Console.Write("#");
                }

                // 蛇移动
                Position head = snake[0];
                Position newHead = new Position(head.X, head.Y);
                switch (direction)
                {
                    case Direction.Up:
                        newHead.Y--;
                        break;
                    case Direction.Down:
                        newHead.Y++;
                        break;
                    case Direction.Left:
                        newHead.X--;
                        break;
                    case Direction.Right:
                        newHead.X++;
                        break;
                }
                snake.Insert(0, newHead);
                snake.RemoveAt(snake.Count - 1);

                // 检查是否吃到食物
                if (head.X == food.X && head.Y == food.Y)
                {
                    // 增加蛇的长度，并重新生成食物位置
                    snake.Add(new Position(food.X, food.Y));
                    food.X = random.Next(0, Console.WindowWidth);
                    food.Y = random.Next(0, Console.WindowHeight);
                }

                // 检查是否游戏结束
                if (head.X < 0 || head.X >= Console.WindowWidth || head.Y < 0 || head.Y >= Console.WindowHeight)
                {
                    Console.SetCursorPosition(10, 10);
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Write("Game Over!");
                    break;
                }
                for (int i = 1; i < snake.Count; i++)
                {
                    if (head.X == snake[i].X && head.Y == snake[i].Y)
                    {
                        Console.SetCursorPosition(10, 10);
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.Write("Game Over!");
                        return;
                    }
                }

                // 检查键盘输入并改变移动方向
                if (Console.KeyAvailable)
                {
                    ConsoleKeyInfo key = Console.ReadKey(true);
                    switch (key.Key)
                    {
                        case ConsoleKey.UpArrow:
                            if (direction != Direction.Down)
                                direction = Direction.Up;
                            break;
                        case ConsoleKey.DownArrow:
                            if (direction != Direction.Up)
                                direction = Direction.Down;
                            break;
                        case ConsoleKey.LeftArrow:
                            if (direction != Direction.Right)
                                direction = Direction.Left;
                            break;
                        case ConsoleKey.RightArrow:
                            if (direction != Direction.Left)
                                direction = Direction.Right;
                            break;
                    }
                }

                // 控制游戏速度
                System.Threading.Thread.Sleep(100);
            }
        }

        // 枚举移动方向
        enum Direction
        {
            Up,
            Down,
            Left,
            Right
        }

        // 位置类
        class Position
        {
            public int X { get; set; }
            public int Y { get; set; }

            public Position(int x, int y)
            {
                X = x;
                Y = y;
            }

            public Position()
            {
                X = 0;
                Y = 0;
            }
        }
    }
}

上述代码使用了 `List` 类型来表示蛇的身体，使用了 `Random` 类型生成食物的位置，使用了 `Console` 类型来控制控制台的输出。在游戏过程中，使用了 `Thread.Sleep` 方法来控制游戏速度。游戏的结束条件是蛇碰到边界或者碰到自己的身体。