在主线程里开启一个子线程，子线程执行完毕再回到主线程

//载入滚动图，在主线程里开启一个子线程，子线程执行完毕再回到主线程
 private void loadThread()
        {
            circularProgress.Visible = true;
            circularProgress.IsRunning = true;
            Thread threadProcess = new Thread(new ParameterizedThreadStart(funtion));
            threadProcess.Start();
        }

        private void funtion(object o)
        {
            for (int i = 1; i < 1000; i++)
            {
                Console.WriteLine(i);
            }

            if (base.InvokeRequired)
            {
                base.Invoke(new Action(() =>
                {
                     circularProgress.IsRunning = false;
                     circularProgress.Visible = false; 
                }));
            }

//用委托
// 定义一个委托实现回调函数
        public delegate void CallBackDelegate();
        CallBackDelegate callBackDelegate;
        private void loadThread()
        {
            circularProgress.Visible = true;
            circularProgress.IsRunning = true;
            callBackDelegate = new CallBackDelegate(stopCircularProgress);
            Thread threadProcess = new Thread(new ParameterizedThreadStart(funtion));
            threadProcess.Start();
        }

        private void funtion(object o)
        {
            for (int i = 1; i < 1000; i++)
            {
                Console.WriteLine(i);
            }
            this.Invoke(callBackDelegate);
        }

        private void stopCircularProgress()
        {
            circularProgress.IsRunning = false;
            circularProgress.Visible = false;  
        }