按钮为何没及时销毁求助

Question

 public Form1()
        {
            InitializeComponent();
            摆放按钮();
        }
              
        private   void 摆放按钮()
        {
            int btnNums = 通关数 + 基数;
            int wid =Convert.ToInt32 (bigWid / btnNums);            
            Point p = new Point(0, 0);
            for (int i = 0; i != btnNums; i++)
            {
                p.X = Convert.ToInt32(x0 + wid * i*0.88);
                for (int j= 0; j!= btnNums;j++)
                {                     
                    Button btn = new Button();//实例化一个button  
                    btn.Name = "btn" + (i+1).ToString()+(j+1).ToString();
                    btn.Text = btn.Name;
                    btn.Width =Convert.ToInt32(wid *0.85);  btn.Height = btn.Width;
                    p.Y= Convert.ToInt32(y0 + wid * j*0.88);                                       
                    btn.Location = p;
                    this.Controls.Add(btn);
                    btn.Click += new EventHandler(aBtn_Click);                }
            }
        }
        private void aBtn_Click(object sender, EventArgs e)
        {          
            Button btn = sender as Button;
            string str = btn.Text.Substring(3);
            int midL= str.Length / 2;
            int H= Convert.ToInt32(str.Substring(0,midL));
            int L= Convert.ToInt32(str.Substring( midL));
            //MessageBox.Show(idx.ToString());
            btn.BackColor = Color.Black;
            foreach (Control ctl in this.Controls)
            {
                if(ctl is Button)
                {
                    if (ctl.Text == "btn" + (H - 1).ToString() + L.ToString())
                        ctl.BackColor = Color.Black; 
                    if (ctl.Text == "btn" + (H + 1).ToString() + L.ToString())
                        ctl.BackColor = Color.Black; 
                    if (ctl.Text == "btn" + H .ToString() + (L-1).ToString())
                        ctl.BackColor = Color.Black;
                    if (ctl.Text == "btn" + H .ToString() + (L+1).ToString())
                        ctl.BackColor = Color.Black;
                }
            }
            清场重来();
        }        private void   清场重来()
        {
            int cntColor=0;
            foreach (Control ctl in this.Controls)
            {
                if (ctl is Button)
                {
                    if (ctl.BackColor == Color.Black) cntColor++;
                }
            }
            if (cntColor == (通关数 + 基数) * (通关数 + 基数))
            {
                通关数++;
                //清空按钮；
                foreach (Control ctl in this.Controls)
                {
                    if (ctl is Button) ctl.Dispose();
                }
                摆放按钮();
            }
        }

Answer 1

这是我的游戏全代码namespace 方框游戏
{
    public partial class Form1 : Form
    {
        public int   通关数 = 0;
        public int       基数= 2;
        public int     x0=125;
        public int     y0 = 25;
        public int   bigWid= 500;        public Form1()
        {
            InitializeComponent();
            摆放按钮();
        }       
        
        private   void 摆放按钮()
        {
            int btnNums = 通关数 + 基数;
            int wid =Convert.ToInt32 (bigWid / btnNums);            
            Point p = new Point(0, 0);
            for (int i = 0; i != btnNums; i++)
            {
                p.X = Convert.ToInt32(x0 + wid * i*0.88);
                for (int j= 0; j!= btnNums;j++)
                {                     
                    Button btn = new Button();//实例化一个button  
                    btn.Name = "btn" + (i+1).ToString()+(j+1).ToString();
                    btn.Text = btn.Name;
                   // btn.Tag = i;//tag是控件留给用户自己定义的一个数据项,可以是任何数据类型包括object  
                    btn.Width =Convert.ToInt32(wid *0.85);  btn.Height = btn.Width;
                    p.Y= Convert.ToInt32(y0 + wid * j*0.88);                                       
                    btn.Location = p;
                    this.Controls.Add(btn);//向具体的控件中添加button  
                    btn.Click += new EventHandler(aBtn_Click);//使用事件函数句柄指向一个具体的函数  
                }
            }
        }
        private void aBtn_Click(object sender, EventArgs e)
        {          
            Button btn = sender as Button;
            string str = btn.Text.Substring(3);
            int midL= str.Length / 2;
            int H= Convert.ToInt32(str.Substring(0,midL));
            int L= Convert.ToInt32(str.Substring( midL));
            //MessageBox.Show(idx.ToString());
            btn.BackColor = Color.Black;
            foreach (Control ctl in this.Controls)
            {
                if(ctl is Button)
                {
                    if (ctl.Text == "btn" + (H - 1).ToString() + L.ToString())
                        ctl.BackColor = Color.Black; 
                    if (ctl.Text == "btn" + (H + 1).ToString() + L.ToString())
                        ctl.BackColor = Color.Black; 
                    if (ctl.Text == "btn" + H .ToString() + (L-1).ToString())
                        ctl.BackColor = Color.Black;
                    if (ctl.Text == "btn" + H .ToString() + (L+1).ToString())
                        ctl.BackColor = Color.Black;
                }
            }
            清场重来();
        }        private void   清场重来()
        {
            int cntColor=0;
            foreach (Control ctl in this.Controls)
            {
                if (ctl is Button)
                {
                    if (ctl.BackColor == Color.Black) cntColor++;
                }
            }
            if (cntColor == (通关数 + 基数) * (通关数 + 基数))
            {
                通关数++;
                //清空按钮；
                foreach (Control ctl in this.Controls)
                {
                    if (ctl is Button) ctl.Dispose();
                }
                摆放按钮();
            }
        }        private void label1_Click(object sender, EventArgs e)
        {
         
        }
    }
}

Answer 2

程序退出，进程销毁时控件才会销毁；使用remove操作或者控制其显隐的方式替换dispose操作，销毁的目的是让按钮不显示。

Answer 3

  if (ctl is Button) ctl.ControlRemoved();错误 CS0079 事件“Control.ControlRemoved”只能出现在 += 或 -= 的左边

Answer 4

            for (int i = 0; i < this.Controls.Count; i++)
            {
                if (this.Controls[i] is Button)
                {
                    this.Controls.RemoveAt(i);
                    i--;
                }
            }