C＃，多线程-表单未更新

我有一个跨多个线程运行的蒙特卡洛模拟程序，并带有一个进度条，以告知用户进展情况。使用Invoke在单独的线程中完成进度条管理，但是该表单未更新。

这是我的代码：

Thread reportingThread = new Thread(() => UpdateProgress(iSims, ref myBag));
reportingThread.Priority = ThreadPriority.AboveNormal;
reportingThread.Start();`

这是被调用的函数：

private void UpdateProgress(int iSims, ref ConcurrentBag<simResult> myBag)
{
    int iCount;
    string sText;

    if (myBag == null)
        iCount = 0;
    else
        iCount = myBag.Count;

    while (iCount < iSims)
    {
        if (this.Msg.InvokeRequired)
        {
             sText = iCount.ToString() + " simultions of " + iSims + " completed.";
            this.Msg.BeginInvoke((MethodInvoker) delegate() { this.Msg.Text = sText; this.Refresh(); });
        }
       Thread.Sleep(1000);
       iCount = myBag.Count;
    }
}

我已经使用了Application.DoEvents（）和this.refresh（）来尝试强制更新表单，但是什么也没有发生。

更新：这是调用上述函数的过程

private void ProcessLeases(Boolean bValuePremium)
    {
        int iSims, iNumMonths, iNumYears, iIndex, iNumCores, iSimRef;
        int iNumSimsPerThread, iThread, iAssets, iPriorityLevel;
        string sMsg;
        DateTime dtStart, dtEnd;
        TimeSpan span;
        var threads = new List<Thread>();
        ConcurrentBag<simResult> myBag = new ConcurrentBag<simResult>();
        ConcurrentBag<summaryResult> summBag = new ConcurrentBag<summaryResult>();

        this.Msg.Text = "Updating all settings";
        Application.DoEvents();
        ShowProgressPanel();

        iSims = objSettings.getSimulations();
        iNumCores = Environment.ProcessorCount;

        this.Msg.Text = "Initialising model";
        Application.DoEvents();
        iNumSimsPerThread = Convert.ToInt16(Math.Round(Convert.ToDouble(iSims) / Convert.ToDouble(iNumCores), 0));

        this.Msg.Text = "Spawning " + iNumCores.ToString() + " threads";

        for (iThread = 0; iThread < iNumCores; iThread++)
        {
            int iStart, iEnd;

            if (iThread == 0)
            {
                iStart = (iThread * iNumSimsPerThread) + 1;
                iEnd = ((iThread + 1) * iNumSimsPerThread);
            }
            else
            {
                if (iThread < (iNumCores - 1))
                {
                    iStart = (iThread * iNumSimsPerThread) + 1;
                    iEnd = ((iThread + 1) * iNumSimsPerThread);
                }
                else
                {
                    iStart = (iThread * iNumSimsPerThread) + 1;
                    iEnd = iSims;
                }
            }
            Thread thread = new Thread(() => ProcessParallelMonteCarloTasks(iStart, iEnd, iNumMonths, iSimRef, iSims, ref objDB, iIndex, ref objSettings, ref myBag, ref summBag));
            switch (iPriorityLevel)
            {
                case 1: thread.Priority = ThreadPriority.Highest; break;
                case 2: thread.Priority = ThreadPriority.AboveNormal; break;
                default: thread.Priority = ThreadPriority.Normal; break;
            }
            thread.Start();
            threads.Add(thread);
        }

        // Now start the thread to aggregate the MC results
        Thread MCThread = new Thread(() => objPortfolio.MCAggregateThread(ref summBag, (iSims * iAssets), iNumMonths));
        MCThread.Priority = ThreadPriority.AboveNormal;
        MCThread.Start();
        threads.Add(MCThread);

        // Here we review the CollectionBag size to report progress to the user
        Thread reportingThread = new Thread(() => UpdateProgress(iSims, ref myBag));
        reportingThread.Priority = ThreadPriority.AboveNormal;
        reportingThread.Start();

        // Wait for all threads to complete
        //this.Msg.Text = iNumCores.ToString() + " Threads running.";
        foreach (var thread in threads)
            thread.Join();

        reportingThread.Abort();

        this.Msg.Text = "Aggregating results";
        Application.DoEvents();

        this.Msg.Text = "Preparing Results";
        Application.DoEvents();
        ShowResults();
        ShowResultsPanel();
    }

如您所见，在调用调用之前，对Form进行了许多更新，并且都可以正常工作-在每种情况下，我都使用Application.DoEvents（）进行更新。

myBag是一个ConcurrentBag，每个monte-carlo线程都将其结果转储到其中。通过使用Count方法，我可以看到完成了多少次仿真并更新了用户。