C#简单的抽奖

    public partial class Form1 : Form
    {
        Point mouseOff;//鼠标移动位置变量
        bool leftFlag;//标记是否为左键
        private const int CS_DropSHADOW = 0x20000;
        private const int GCL_STYLE = (-26);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int GetClassLong(IntPtr hwnd, int nIndex);
        int time = 5;//倒计时
        int loc = 0;//数组下标
        int num = 38;//随机数最大值
        string[] arr_name = new string[] { "刘召星", "宋光明", "胡龙辉", "胡龙军", "刘军辉", "郭林浩", "王星辉", "霍佳敏", "高春元", "杨青龙", "张航", "灿毛", "南宝山", "冯瑞", "闵浩", "孙鑫", "汪显鹏", "马旭龙", "王永康", "薛豪", "张鹏飞", "王豪", "杨金龙", "唐乾银", "毛彦杰", "李鹏鹏", "王高磊", "刘子敏", "申轩", "陈丽", "罗贤芬", "余田", "康国梁", "任仲伟", "熊嘉威", "余春彬", "段李博", "王凯"};
        public Form1()
        {
            InitializeComponent();
            SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW);
        }

        private void butStart_Click(object sender, EventArgs e)
        {
            butStart.Enabled = false;
            timerBut.Enabled = true;
            butStart.Text = "抽奖中(5)";
            timerName.Enabled = true;
            labName.ForeColor = Color.Yellow;
            this.pictureBox1.Visible = false;
            this.pictureBox2.Visible = false;
            this.pictureBox3.Visible = false;
            this.pictureBox4.Visible = false;
            this.pictureBox5.Visible = false;
            
        }

        private void timerBut_Tick(object sender, EventArgs e)
        {
            time--;
            butStart.Text = "抽奖中("   time   ")";
            if (time == -1)
            {

                labName.Text = "恭喜"   arr_name   "!";
                butStart.Text = "抽奖";
                butStart.Enabled = true;
                timerBut.Enabled = false;
                timerName.Enabled = false;
                labName.ForeColor = Color.Red;
                time = 5;
                pictureBox1.Enabled = true;
                this.pictureBox1.Visible = true;
                pictureBox2.Enabled = true;
                this.pictureBox2.Visible = true;
                pictureBox3.Enabled = true;
                this.pictureBox3.Visible = true;
                pictureBox4.Enabled = true;
                this.pictureBox4.Visible = true;
                pictureBox5.Enabled = true;
                this.pictureBox5.Visible = true; 
                //抽完一次覆盖该名称
                for (int i = loc; i < arr_name.Length - 1; i  )
                {
                    arr_name[i] = arr_name[i   1];
                }
                num--;//随机数范围-1
            }
        }

        private void timerName_Tick(object sender, EventArgs e)
        {
                Random ra = new Random();
                loc = ra.Next(num);
                labName.Text = arr_name[loc];
        }

        private void labName_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Form1_VisibleChanged(object sender, EventArgs e)
        {

        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseOff = new Point(-e.X, -e.Y); //得到变量的值
                leftFlag = true;                  //点击左键按下时标注为true;
            }
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                Point mouseSet = Control.MousePosition;
                mouseSet.Offset(mouseOff.X, mouseOff.Y);  //设置移动后的位置
                Location = mouseSet;
            }
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                leftFlag = false;//释放鼠标后标注为false;
            }
        }
    }
}