C#多线程异步执行耗时

       // 界面的控件button , label, progressBar, statusStrip中的toolStripProgressBar
        public Form1()
        {
            InitializeComponent();
        }

        long number = 0;
        DateTime beginDate;    //记时 
        DateTime endDate;
        private void button1_Click(object sender, EventArgs e)
        {
            beginDate = DateTime.Now;// 记录当前时间
            number = 0;
            this.label1.Text = "label1";
            this.progressBar1.Value = 0;
            this.button1.Enabled = false;

            Thread thread = new Thread(new ThreadStart(myFun));
            thread.Name = "thread1";
            thread.IsBackground = true;
            thread.Start();
        }

       // 耗时操作
        private void myFun()
        {
            for (int i = 0; i < 100000000; i++)
            {
                number += i;
            }
            if (this.InvokeRequired)//进行判断
            {
                this.BeginInvoke(new Test(this.sum)); //显示到界面上
            }
            else
            {
                sum();
            }
        }

delegate

        delegate void Test();

        private void sum()
        {
            endDate = DateTime.Now;
            System.TimeSpan timeSpan = endDate - beginDate;
            progressBar1.Maximum = timeSpan.Milliseconds;

            toolStripProgressBar1.Maximum = timeSpan.Milliseconds;

            for (int i = 0; i <= timeSpan.Milliseconds; i++)
            {
                progressBar1.Value = i;
                toolStripProgressBar1.Value = i;
                Application.DoEvents();
            }

            this.label1.Text = number.ToString();
            this.button1.Enabled = true;
        }