public ActionResult About1()
        {
            ViewData["msg"] = "當前線程：" + Thread.CurrentThread.ManagedThreadId.ToString();
            return View();
        ｝

            for (int i = 0; i < 10; i++)
            {
                var t = new Thread(() =>
                {
                    ViewData["msg"] = ViewData["msg"] + DbFactory.Intance();
                });
                t.Start();
　　　　　　　　　Thread.Sleep(1000);
            }

    /// <summary>
    /// 線(xian)程單例對象(xiang)工廠(chang)
    /// </summary>
    internal static class DbFactory
    {
        volatile static Dictionary<Thread, string> divDataContext;
        static System.Timers.Timer sysTimer;
        static DbFactory()
        {
            divDataContext = new Dictionary<Thread, string>();
            sysTimer = new System.Timers.Timer(10000);
            sysTimer.AutoReset = true;
            sysTimer.Enabled = true;
            sysTimer.Elapsed += new System.Timers.ElapsedEventHandler(sysTimer_Elapsed);
            sysTimer.Start();
        }

        /// <summary>
        /// 清(qing)理上下文(wen)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        static void sysTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            List<Thread> list = divDataContext
                .Keys
                .Where(item => item.ThreadState == ThreadState.Stopped)
                .ToList();
            if (list != null && list.Count > 0)
            {
                foreach (var i in list)
                {
                    divDataContext[i] = null;
                    divDataContext.Remove(i);
                }
            }
        }
        /// <summary>
        /// 生成對象
        /// </summary>
        /// <returns></returns>
        public static string Intance()
        {

            if (!divDataContext.Keys.Contains(Thread.CurrentThread))
            {
                divDataContext.Add(Thread.CurrentThread, "當(dang)前線程名稱:"
                       + Thread.CurrentThread.ManagedThreadId.ToString().PadLeft(2, '0')
                       + ",線(xian)程總數:"
                       + divDataContext.Count
                       + ",已(yi)經結束的總數(shu):"
                       + divDataContext.Keys.Where(item => item.ThreadState == ThreadState.Stopped).Count()
                       + "<hr>");
            }

            return divDataContext[Thread.CurrentThread];
        }
    }