使用拖管和线程

         delegate void mydelegate(MainF f);//定义拖管 参数为MainF类型       

        Thread t; //声明线程

 

        public void ThreadStart() //线程启动击需要的函数参数
        {
            Thread.Sleep(2000);
            Random rNum=new Random();
            randomNum = rNum.Next(4, 10);
            for (reDoI=1; reDoI<=randomNum; reDoI++)
            {
                this.BeginInvoke(new mydelegate(CreateForm), new MainF[] { f });
                Thread.Sleep(1000);//循环执行线程中的CreateForm函数
            }                                  // CreateForm与拖管函数mydeletage的形式一样

 

////// or do some other things
        }

        public void CreateForm(MainF f)
        {
            if (labeltip.Text.Length >= 10)
                labeltip.Text = "正在登陆";
             labeltip.Text = labeltip.Text + ".";

             if (reDoI == randomNum)
             {
                 f = new MainF();
                 if (t.IsAlive)
                 {
                   t.Abort();
                 }
                  f.Show();
                 this.Hide();
             }
        }