const int N = 4; //按钮的行、列数        Button[,] buttons = new Button[N, N]; //按钮的数组         private void Form1_Load(object sender, EventArgs e)        {            //产生所有按钮            GenerateAllButtons();        }         private void button1_Click(object sender, EventArgs e)        {            //打乱顺序            Shuffle();        }          //打乱顺序        void Shuffle()        {            //多次随机交换两个按钮            Random rnd = new Random();            for (int i = 0; i < 100; i++)            {                int a = rnd.Next(N);                int b = rnd.Next(N);                int c = rnd.Next(N);                int d = rnd.Next(N);                Swap(buttons[a, b], buttons[c, d]);            }        }         //生成所有的按钮        void GenerateAllButtons()        {            int x0 = 100, y0 = 10, w = 45, d = 50;            for (int r = 0; r < N; r++)                for (int c = 0; c < N; c++)                {                    int num = r * N + c;                    Button btn = new Button();                    btn.Text = (num + 1).ToString();                    btn.Top = y0 + r * d;                    btn.Left = x0 + c * d;                    btn.Width = w;                    btn.Height = w;                    btn.Visible = true;                    btn.Tag = r * N + c; //这个数据用来表示它所在行列位置                                         //注册事件                    btn.Click += new EventHandler(btn_Click);                     buttons[r, c] = btn; //放到数组中                    this.Controls.Add(btn); //加到界面上                }            buttons[N - 1, N - 1].Visible = false; //最后一个不可见        }         //交换两个按钮        void Swap(Button btna, Button btnb)        {            string t = btna.Text;            btna.Text = btnb.Text;            btnb.Text = t;             bool v = btna.Visible;            btna.Visible = btnb.Visible;            btnb.Visible = v;        }         //按钮点击事件处理        void btn_Click(object sender, EventArgs e)        {            Button btn = sender as Button; //当前点中的按钮            Button blank = FindHiddenButton(); //空白按钮             //判断是否与空白块相邻，如果是，则交换            if (IsNeighbor(btn, blank))            {                Swap(btn, blank);                blank.Focus();            }             //判断是否完成了            if (ResultIsOk())            {                MessageBox.Show("ok");            }        }         //查找要隐藏的按钮        Button FindHiddenButton()        {            for (int r = 0; r < N; r++)                for (int c = 0; c < N; c++)                {                    if (!buttons[r, c].Visible)                    {                        return buttons[r, c];                    }                }            return null;        }         //判断是否相邻        bool IsNeighbor(Button btnA, Button btnB)        {            int a = (int)btnA.Tag; //Tag中记录是行列位置            int b = (int)btnB.Tag;            int r1 = a / N, c1 = a % N;            int r2 = b / N, c2 = b % N;             if (r1 == r2 && (c1 == c2 - 1 || c1 == c2 + 1) //左右相邻                || c1 == c2 && (r1 == r2 - 1 || r1 == r2 + 1))                return true;            return false;        }         //检查是否完成        bool ResultIsOk()        {            for (int r = 0; r < N; r++)                for (int c = 0; c < N; c++)                {                    if (buttons[r, c].Text != (r * N + c + 1).ToString())                    {                        return false;                    }                }            return true;        }