贪吃蛇大作战双人版完整代码，不懂问博主。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace 贪吃蛇
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Background = Brushes.Pink;
        }
        Random ra = new Random();
        Border food;
        Border bd1;
        DispatcherTimer dt;
        string s = "";
        string s1 = "";
        List<Border> snack = new List<Border>();
        List<Border> snakeback = new List<Border>();
        List<Border> snack1 = new List<Border>();
        List<Border> snakeback1 = new List<Border>();
        //创建一个放食物的集合
        List<Border> foodback = new List<Border>();
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            this.Left = 0;
            this.Top = 0;
            //this.Width = SystemParameters.FullPrimaryScreenWidth;
            //this.Height = SystemParameters.FullPrimaryScreenHeight;
            this.Width = 800;
            this.Height = 600;
            for (int i = 0; i < 5; i++)
            {
                Border bd = new Border();
                if (i == 0)
                {
                    bd.Background = Brushes.Red;
                }
                else
                {
                    bd.Background = Brushes.Black;
                }
                bd.Height = bd.Width = 10;
                bd.CornerRadius = new CornerRadius(5);
                Canvas.SetLeft(bd, 200);
                Canvas.SetTop(bd, 200 + i * bd.Height);
                back.Children.Add(bd);
                snack.Add(bd);
                //存储蛇的位置的border
                Border bdback = new Border();
                Canvas.SetLeft(bdback, 200);
                Canvas.SetTop(bdback, 200 + i * bd.Height);
                snakeback.Add(bdback);
            }
            for (int i = 0; i < 5; i++)
            {
                bd1 = new Border();
                bd1.Width = bd1.Height = 10;
                bd1.CornerRadius = new CornerRadius(5);
                if (i == 0)
                    bd1.Background = Brushes.Chocolate;
                else
                    bd1.Background = Brushes.DarkBlue;
                Canvas.SetTop(bd1, 400 + i * bd1.Height);
                Canvas.SetLeft(bd1, 400);
                back.Children.Add(bd1);
                snack1.Add(bd1);

                //创建蛇的位置border
                Border bdback1 = new Border();
                bdback1.Height = bdback1.Width = 10;
                Canvas.SetTop(bdback1, 400 + i * bd1.Height);
                Canvas.SetLeft(bdback1, 400);
                snakeback1.Add(bdback1);
            }
            this.KeyDown += MainWindow_KeyDown;
            dt = new DispatcherTimer();
            dt.Tick += Dt_Tick;
            dt.Interval = TimeSpan.FromMilliseconds(80);
            dt.Start();
            for (int i = 0; i < 30; i++)
            {
                //创建食物
                food = new Border();
                food.Width = food.Height = 10;
                food.Background = Brushes.Yellow;
                Canvas.SetTop(food, ra.Next(60) * 10);
                Canvas.SetLeft(food, ra.Next(80) * 10);
                food.CornerRadius = new CornerRadius(10);
                back.Children.Add(food);
                foodback.Add(food);
            }
        }

        private void Dt_Tick(object sender, EventArgs e)
        {
            if (s == "up")
            {
                Canvas.SetTop(snack[0], Canvas.GetTop(snack[0]) - snack[0].Height);
                Run();

            }
            if (s == "down")
            {
                Canvas.SetTop(snack[0], Canvas.GetTop(snack[0]) + snack[0].Height);
                Run();

            }
            if (s == "left")
            {
                Canvas.SetLeft(snack[0], Canvas.GetLeft(snack[0]) - snack[0].Width);
                Run();

            }
            if (s == "right")
            {
                Canvas.SetLeft(snack[0], Canvas.GetLeft(snack[0]) + snack[0].Width);
                Run();

            }
            if (s1 == "w")
            {
                Canvas.SetTop(snack1[0], Canvas.GetTop(snack1[0]) - snack1[0].Height);
                Run1();
            }
            if (s1 == "s")
            {
                Canvas.SetTop(snack1[0], Canvas.GetTop(snack1[0]) + snack1[0].Height);
                Run1();
            }
            if (s1 == "a")
            {
                Canvas.SetLeft(snack1[0], Canvas.GetLeft(snack1[0]) - snack1[0].Width);
                Run1();
            }
            if (s1 == "d")
            {
                Canvas.SetLeft(snack1[0], Canvas.GetLeft(snack1[0]) + snack1[0].Width);
                Run1();
            }
            for (int i = 0; i < 30; i++)
            {
                if (Canvas.GetTop(snack1[0]) == Canvas.GetTop(foodback[i]) && Canvas.GetLeft(snack1[0]) == Canvas.GetLeft(foodback[i]))
                {
                    Canvas.SetTop(foodback[i], ra.Next(60) * 10);
                    Canvas.SetLeft(foodback[i], ra.Next(80) * 10);

                    //创建一个border添加到尾部
                    Border bdfood1 = new Border();
                    bdfood1.Width = bdfood1.Height = 10;
                    bdfood1.Background = Brushes.DarkBlue;
                    bdfood1.CornerRadius = new CornerRadius(5);
                    Canvas.SetTop(bdfood1, Canvas.GetTop(snack[snack.Count - 1]));
                    Canvas.SetLeft(bdfood1, Canvas.GetLeft(snack[snack.Count - 1]));
                    snack1.Add(bdfood1);
                    back.Children.Add(bdfood1);

                    //创建一个border，存放加到后面的蛇身的位置
                    Border br1 = new Border();
                    Canvas.SetTop(br1, Canvas.GetTop(bdfood1));
                    Canvas.SetLeft(br1, Canvas.GetLeft(bdfood1));
                    snakeback1 .Add(br1);
                }
            }
            for (int i = 0; i < 30; i++)
            {
                if (Canvas.GetTop(snack[0]) == Canvas.GetTop(foodback[i]) && Canvas.GetLeft(snack[0]) == Canvas.GetLeft(foodback[i]))
                {
                    Canvas.SetTop(foodback[i], ra.Next(60) * 10);
                    Canvas.SetLeft(foodback[i], ra.Next(80) * 10);

                    //创建一个border添加到尾部
                    Border bdfood = new Border();
                    bdfood.Width = bdfood.Height = 10;
                    bdfood.Background = Brushes.Black;
                    bdfood.CornerRadius = new CornerRadius(5);
                    Canvas.SetTop(bdfood, Canvas.GetTop(snack[snack.Count - 1]));
                    Canvas.SetLeft(bdfood, Canvas.GetLeft(snack[snack.Count - 1]));
                    snack.Add(bdfood);
                    back.Children.Add(bdfood);

                    //创建一个border，存放加到后面的蛇身的位置
                    Border br = new Border();
                    Canvas.SetTop(br, Canvas.GetTop(bdfood));
                    Canvas.SetLeft(br, Canvas.GetLeft(bdfood));
                    snakeback.Add(br);
                }
            }
            for (int i = 1; i < snack.Count; i++)
            {
                if (Canvas.GetTop(snack[0]) == Canvas.GetTop(snack[i]) && Canvas.GetLeft(snack[0]) == Canvas.GetLeft(snack[i]))
                {
                    dt.Stop();
                    MessageBox.Show("GAME  OVER!");
                }
            }
            if (Canvas.GetTop(snack[0]) == 0 || Canvas.GetLeft(snack[0]) == 0 || Canvas.GetTop(snack[0]) == 560 || Canvas.GetLeft(snack[0]) == 780)
            {
                dt.Stop();
                MessageBox.Show("GAME  OVER!");
            }
            for (int i = 1; i < snack1.Count; i++)
            {
                if (Canvas.GetTop(snack1[0]) == Canvas.GetTop(snack1[i]) && Canvas.GetLeft(snack1[0]) == Canvas.GetLeft(snack1[i]))
                {
                    dt.Stop();
                    MessageBox.Show("GAME  OVER!");
                }
            }
            if (Canvas.GetTop(snack1[0]) == 0 || Canvas.GetLeft(snack1[0]) == 0 || Canvas.GetTop(snack1[0]) == 560 || Canvas.GetLeft(snack1[0]) == 780)
            {
                dt.Stop();
                MessageBox.Show("GAME  OVER!");
            }
        }
        private void Run()
        {
            for (int i = 1; i < snack.Count; i++)
            {
                Canvas.SetTop(snack[i], Canvas.GetTop(snakeback[i - 1]));
                Canvas.SetLeft(snack[i], Canvas.GetLeft(snakeback[i - 1]));
            }
            for (int i = 0; i < snack.Count; i++)
            {
                Canvas.SetTop(snakeback[i], Canvas.GetTop(snack[i]));
                Canvas.SetLeft(snakeback[i], Canvas.GetLeft(snack[i]));
            }
        }
        private void Run1()
        {
            for (int i = 1; i < snack1.Count; i++)
            {
                Canvas.SetTop(snack1[i], Canvas.GetTop(snakeback1[i - 1]));
                Canvas.SetLeft(snack1[i], Canvas.GetLeft(snakeback1[i - 1]));
            }
            for (int i = 0; i < snack1.Count; i++)
            {
                Canvas.SetTop(snakeback1[i], Canvas.GetTop(snack1[i]));
                Canvas.SetLeft(snakeback1[i], Canvas.GetLeft(snack1[i]));
            }
        }
        private void MainWindow_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Up && s != "down")
            {
                s = "up";
            }
            if (e.Key == Key.Down && s != "up")
            {
                s = "down";
            }
            if (e.Key == Key.Left && s != "right")
            {
                s = "left";
            }
            if (e.Key == Key.Right && s != "left")
            {
                s = "right";
            }
            if (e.Key == Key.W && s1 != "s")
            {
                s1 = "w";
            }
            if (e.Key == Key.S && s1 != "w")
            {
                s1 = "s";
            }
            if (e.Key == Key.A && s1 != "d")
            {
                s1 = "a";
            }
            if (e.Key == Key.D && s1 != "a")
            {
                s1 = "d";
            }
        }
    }
}