贪吃蛇的程序，蛇吃到食物的时候程序就运行不了，请帮忙修改下

Question

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;namespace Snake
{
    //移动方向
    public enum Way
    {
        EAST,
        SOUTH,
        WEST,
        NORTH
    }
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class mainForm : System.Windows.Forms.Form
    {
        //移动速度控制
        private int speed = 500;
        //食物坐标
        private Point foodPoint;
        //食物颜色
        private System.Drawing.Color foodColor = System.Drawing.Color.Green;
        //统计吞下多少食物
        private int foodCount = 0;
        //是否停止游戏
        private bool isStop = false;
        private System.Windows.Forms.Panel panel1;
        private SnakeMod snake = new SnakeMod();
        private System.Windows.Forms.Button button1;
        private Thread game;
        private IContainer components;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.MainMenu mainMenu1;
        private System.Windows.Forms.MenuItem menuItem1;
        private System.Windows.Forms.MenuItem menuItem2;
        private System.Windows.Forms.MenuItem menuItem3;
        private System.Windows.Forms.MenuItem menuItem4;
        private System.Windows.Forms.MenuItem menuItem5;
        private System.Windows.Forms.MenuItem menuItem6;
        private System.Windows.Forms.MenuItem menuItem8;
        private System.Windows.Forms.MenuItem menuItem9;
        private System.Windows.Forms.MenuItem menuItem10;
        private System.Windows.Forms.MenuItem menuItem11;
        private System.Windows.Forms.MenuItem menuExit;
        private System.Windows.Forms.Label label2;
        //创建委托
        private delegate void DrawDele();
        private DrawDele drawDelegate;        public mainForm()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();
            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose(bool disposing)
        {
            try
            {
                game.Abort();
            }
            catch
            {
            }
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }        #region Windows 窗体设计器生成的代码
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.panel1 = new System.Windows.Forms.Panel();
            this.button1 = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.mainMenu1 = new System.Windows.Forms.MainMenu(this.components);
            this.menuItem1 = new System.Windows.Forms.MenuItem();
            this.menuItem2 = new System.Windows.Forms.MenuItem();
            this.menuItem3 = new System.Windows.Forms.MenuItem();
            this.menuItem4 = new System.Windows.Forms.MenuItem();
            this.menuItem8 = new System.Windows.Forms.MenuItem();
            this.menuItem9 = new System.Windows.Forms.MenuItem();
            this.menuItem10 = new System.Windows.Forms.MenuItem();
            this.menuItem11 = new System.Windows.Forms.MenuItem();
            this.menuExit = new System.Windows.Forms.MenuItem();
            this.menuItem5 = new System.Windows.Forms.MenuItem();
            this.menuItem6 = new System.Windows.Forms.MenuItem();
            this.label2 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // panel1
            // 
            this.panel1.BackColor = System.Drawing.Color.Black;
            this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.panel1.Location = new System.Drawing.Point(8, 8);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(400, 300);
            this.panel1.TabIndex = 0;
            // 
            // button1
            // 
            this.button1.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
            this.button1.ForeColor = System.Drawing.Color.Red;
            this.button1.Location = new System.Drawing.Point(432, 168);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "开始";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // textBox1
            // 
            this.textBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.textBox1.Enabled = false;
            this.textBox1.Location = new System.Drawing.Point(464, 88);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(48, 21);
            this.textBox1.TabIndex = 2;
            this.textBox1.Text = "0";
            // 
            // label1
            // 
            this.label1.BackColor = System.Drawing.SystemColors.AppWorkspace;
            this.label1.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label1.ForeColor = System.Drawing.Color.Red;
            this.label1.Location = new System.Drawing.Point(416, 88);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(48, 24);
            this.label1.TabIndex = 3;
            this.label1.Text = "积分";
            // 
            // mainMenu1
            // 
            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem1,
            this.menuItem5});
            // 
            // menuItem1
            // 
            this.menuItem1.Index = 0;
            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem2,
            this.menuItem3,
            this.menuItem4,
            this.menuExit});
            this.menuItem1.Text = "游戏设置";
            // 
            // menuItem2
            // 
            this.menuItem2.Index = 0;
            this.menuItem2.Text = "蛇体颜色设置";
            this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
            // 
            // menuItem3
            // 
            this.menuItem3.Index = 1;
            this.menuItem3.Text = "食物颜色设置";
            this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click);
            // 
            // menuItem4
            // 
            this.menuItem4.Index = 2;
            this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem8,
            this.menuItem9,
            this.menuItem10,
            this.menuItem11});
            this.menuItem4.Text = "游戏难度设置";
            // 
            // menuItem8
            // 
            this.menuItem8.Checked = true;
            this.menuItem8.Index = 0;
            this.menuItem8.Text = "菜鸟";
            this.menuItem8.Click += new System.EventHandler(this.menuItem8_Click);
            // 
            // menuItem9
            // 
            this.menuItem9.Index = 1;
            this.menuItem9.Text = "大鸟";
            this.menuItem9.Click += new System.EventHandler(this.menuItem9_Click);
            // 

Answer 1

            // menuItem10
            // 
            this.menuItem10.Index = 2;
            this.menuItem10.Text = "老鸟";
            this.menuItem10.Click += new System.EventHandler(this.menuItem10_Click);
            // 
            // menuItem11
            // 
            this.menuItem11.Index = 3;
            this.menuItem11.Text = "自虐";
            this.menuItem11.Click += new System.EventHandler(this.menuItem11_Click);
            // 
            // menuExit
            // 
            this.menuExit.Index = 3;
            this.menuExit.Text = "退出";
            this.menuExit.Click += new System.EventHandler(this.menuExit_Click);
            // 
            // menuItem5
            // 
            this.menuItem5.Index = 1;
            this.menuItem5.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem6});
            this.menuItem5.Text = "帮助";
            // 
            // menuItem6
            // 
            this.menuItem6.Index = 0;
            this.menuItem6.Text = "游戏控制说明";
            this.menuItem6.Click += new System.EventHandler(this.menuItem6_Click);
            // 
            // label2
            // 
            this.label2.BackColor = System.Drawing.SystemColors.AppWorkspace;
            this.label2.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label2.ForeColor = System.Drawing.Color.Red;
            this.label2.Location = new System.Drawing.Point(424, 224);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(112, 48);
            this.label2.TabIndex = 5;
            this.label2.Text = "adws为左右上下方向控制键，空格暂停";
            // 
            // mainForm
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.BackColor = System.Drawing.SystemColors.Window;
            this.ClientSize = new System.Drawing.Size(544, 318);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.panel1);
            this.IsMdiContainer = true;
            this.MaximizeBox = false;
            this.Menu = this.mainMenu1;
            this.MinimizeBox = false;
            this.Name = "mainForm";
            this.Text = "贪吃蛇";
            this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.mainForm_KeyPress);
            this.ResumeLayout(false);
            this.PerformLayout();        }
        #endregion        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        //画蛇
        private void DrawSnake()
        {
            lock (this)
            {
                foreach (Label temp in snake.GetSnake())
                {
                    this.panel1.Controls.Add(temp);
                }
            }
        }        //开始游戏
        private void StartGame()
        {
            drawDelegate = new DrawDele(PutFood);
            this.Invoke(drawDelegate, null);
            while (true)
            {
                Thread.Sleep(speed);
                if (this.IsGameOver())
                {
                    MessageBox.Show("GAME OVER");
                    try
                    {
                        this.game.Abort();
                    }
                    catch
                    {
                    }
                }
                if (this.snake.Eat(this.foodPoint))
                {
                    //改变积分
                    this.textBox1.Text = System.Convert.ToString(++this.foodCount * 10);
                    //消除原本食物
                    drawDelegate = new DrawDele(KillFood);
                    this.Invoke(drawDelegate, null);
                    //添加新食物
                    drawDelegate = new DrawDele(PutFood);
                    this.Invoke(drawDelegate, null);
                }
                drawDelegate = new DrawDele(MoveSnake);
                this.Invoke(drawDelegate, null);
            }
        }
        [STAThread]
        static void Main()
        {
            Application.Run(new mainForm());
            //Application.Run(new Snake.SnakeColor());
        }        private void button1_Click(object sender, System.EventArgs e)
        {
            //屏蔽游戏菜单
            this.menuItem1.Enabled = false;
            this.menuItem5.Enabled = false;
            //画蛇
            this.snake.DrawSnake();
            game = new Thread(new ThreadStart(StartGame));
            game.Start();
            this.DrawSnake();
            this.button1.Enabled = false;
            this.Focus();
        }
        private void MoveSnake()
        {
            this.snake.Move(this.panel1);
        }        //发放食物
        private void PutFood()
        {            Random rand = new Random();
            int x = rand.Next(350);
            int y = rand.Next(250);
            Label lblFood = new Label();
            lblFood.Size = new Size(10, 10);
            lblFood.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            lblFood.BackColor = foodColor;
            lblFood.Location = new Point(x % 10 == 0 ? x : x + (10 - x % 10), y % 10 == 0 ? y : y + (10 - y % 10));
            this.foodPoint = new Point(lblFood.Left, lblFood.Top);
            this.panel1.Controls.Add(lblFood);        }
        //接受键盘事件处理
        private void mainForm_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == 'a')
                this.snake.SnakeWay = (this.snake.SnakeWay == Way.EAST) ? Way.EAST : Way.WEST;
            else if (e.KeyChar == 'd')
                this.snake.SnakeWay = (this.snake.SnakeWay == Way.WEST) ? Way.WEST : Way.EAST;
            else if (e.KeyChar == 'w')
                this.snake.SnakeWay = (this.snake.SnakeWay == Way.SOUTH) ? Way.SOUTH : Way.NORTH;
            else if (e.KeyChar == 's')
                this.snake.SnakeWay = (this.snake.SnakeWay == Way.NORTH) ? Way.SOUTH : Way.SOUTH;
            else if (e.KeyChar == 32)
            {
                if (this.isStop)
                    game.Resume();
                else
                    game.Suspend();
                this.isStop = !this.isStop;
            }
            else
                e.Handled = true;
        }
        private void KillFood()
        {
            this.ClearFood(this.foodPoint);
        }
        private void ClearFood(Point food)
        {
            this.panel1.Controls.Remove(this.panel1.GetChildAtPoint(food));
        }
        //是否GameOver
        private bool IsGameOver()
        {
            ArrayList temp = this.snake.GetSnake();
            Label head = (Label)temp[0];
            foreach (Label lbl in temp.GetRange(1, temp.Count - 1))
            {
                if (lbl.Left == head.Left && lbl.Top == head.Top)
                {
                    return true;
                }
            }
            if (((Label)this.snake.GetSnake()[0]).Left == 0 || ((Label)this.snake.GetSnake()[0]).Left == 390 || ((Label)this.snake.GetSnake()[0]).Top == 0 || ((Label)this.snake.GetSnake()[0]).Top == 290)
            {
                return true;
            }
            return false;
        }        private void menuItem6_Click(object sender, System.EventArgs e)
        {
            MessageBox.Show(this, "ASDW为方向控制键\n空格为游戏暂停", "控制说明");
        }        private void menuItem2_Click(object sender, System.EventArgs e)
        {
            //蛇体颜色设置
            SnakeColor temp = new SnakeColor();
            if (temp.ShowDialog(this) == DialogResult.OK)
            {
                this.snake.BodyColor = temp.Color;
                temp.Dispose();
            }
        }        private void menuItem3_Click(object sender, System.EventArgs e)
        {
            //食物颜色设置
            SnakeColor temp = new SnakeColor();
            if (temp.ShowDialog(this) == DialogResult.OK)
            {
                this.foodColor = temp.Color;
                temp.Dispose();
            }
        }        private void menuItem8_Click(object sender, System.EventArgs e)
        {
            ClearHook();
            this.menuItem8.Checked = true;
            this.speed = 500;
            //菜鸟难度
        }        private void menuItem10_Click(object sender, System.EventArgs e)
        {
            ClearHook();
            this.menuItem10.Checked = true;
            this.speed = 180;
        }        private void menuItem11_Click(object sender, System.EventArgs e)
        {
            ClearHook();
            this.menuItem11.Checked = true;
            this.speed = 100;
        }        private void menuItem9_Click(object sender, System.EventArgs e)
        {
            //大鸟难度
            ClearHook();
            this.menuItem9.Checked = true;
            this.speed = 300;
        }
        //取消菜单前的钩
        private void ClearHook()
        {
            this.menuItem8.Checked = false;
            this.menuItem9.Checked = false;
            this.menuItem10.Checked = false;
            this.menuItem11.Checked = false;
        }        private void menuExit_Click(object sender, EventArgs e)
        {        }
    }
}

Answer 2

因为蛇可以动，所以问题一定出在Eat上面，Eat里面有KillFood和PutFood，PutFood已经调用过，应该没问题，那问题就在KillFood上面，KillFood只有一行有效的代码： this.panel1.Controls.Remove(this.panel1.GetChildAtPoint(food));
 //这一行，GetChildAtPoint有可能得不到Label控件，但异步执行，无法看到异常信息。

Answer 3

改进一下，在记录坐标foodPoint时，把Label控件也记录下来，删除时就可以直接引用，不需要调用GetChildAtPoint函数了