我在WinForms应用程序中有两个计时器（System.Windows.Forms.Timer）。
两个计时器同时启动。一个计时器在程序更新三个标签的整个生命周期中启动和停止，另一个计时器只在每次tick事件更新一个标签时运行和完成其工作。然而，当第一个计时器在其tick事件中运行代码时，第二个计时器不运行。
在第一个计时器tick事件代码中，我插入了多个System.Threading.Thread.Yield();语句，但是第二个计时器仍然被阻塞，搜索结果为空。
我试着为第二个计时器使用系统线程，但它什么也没做。
我不知道。有什么主意吗？

public partial class fMain2 : Form
{
    private System.Windows.Forms.Timer timer;
    private System.Windows.Forms.Timer timer2;
    private Thread tThread;
    
    private int totTime;
    private int curTime;
    private int exTime = 0;
    public int runTime = 0;
    
    private void cmdRun_Click(object sender, EventArgs e)
    {
        //calculate total time
        totTime = iCount * iDuration;
        lblTotTime.Text = totTime.ToString();
        lblTotEx.Text = exTime.ToString();
        System.Threading.Thread.Yield();

        curTime = int.Parse("0" + txtDuration.Text);
        
        System.Threading.Thread.Yield();

        this.Refresh();

        strFile = "Begin" + ".wav";
        snd.SoundLocation = strSoundFilePath + strFile;
        snd.PlaySync();
        
        //select first item in the listview
        lvTimer.Items[0].Selected = true;
        lvi = lvTimer.Items[0];
        lvTimer.Refresh();
        
        strFile = lvi.SubItems[1].Text + ".wav";
        snd.SoundLocation = strSoundFilePath + strFile;
        snd.PlaySync();
        System.Threading.Thread.Yield();

        strFile = "Go" + ".wav";
        snd.SoundLocation = strSoundFilePath + strFile;
        snd.PlaySync();
        
        //attempted using a thread for timer2
        timer.Start();
        //tThread = new Thread(new ThreadStart(timer2.Start));

        timer2.Start();
        //tThread.Start();
    }
        
    private void timerTick(object sender, EventArgs e)
    {
        string strFile;
        
        curTime -= 1;
        totTime -= 1;
        
        exTime += 1;

        System.Threading.Thread.Yield();

        lblCurTime.Text = curTime.ToString();
        lblTotTime.Text = totTime.ToString();
        lblTotEx.Text = exTime.ToString();
        this.Refresh();
        
        System.Threading.Thread.Yield();

        if (curTime == 0)
        {
            timer.Stop();

            System.Threading.Thread.Yield();
            System.Threading.Thread.Yield();

            strFile = "Stop" + ".wav";
            snd.SoundLocation = strSoundFilePath + strFile;
            snd.PlaySync();

            System.Threading.Thread.Yield();
            System.Threading.Thread.Yield();
            
            if (totTime == 0)
            {
                //this marks the end of the program
                timer2.Stop();
                //tThread.Abort();
                
                //more code but not relevant
                return;
            }
            else
            { //we are still working down the listview
                
                try
                {
                    lvi = lvTimer.Items[lvi.Index + 1];
                    lvTimer.Items[lvi.Index].Selected = true;
                    lvTimer.FocusedItem = lvTimer.Items[lvi.Index];
                    lvTimer.Refresh();
                    System.Threading.Thread.Yield();
                    System.Threading.Thread.Yield();
                    System.Threading.Thread.Yield();
                }
                catch (IndexOutOfRangeException ei)
                {
                    strFile = "End" + ".wav";
                    snd.SoundLocation = strSoundFilePath + strFile;
                    snd.PlaySync();
                    bRunning = false;
                    ResetTime();
                    return;
                }

                curTime = int.Parse("0" + txtDuration.Text);

                lblCurTime.Text = curTime.ToString();
                lblTotTime.Text = totTime.ToString();

                System.Threading.Thread.Yield();
                System.Threading.Thread.Yield();
                
                //I'm wondering if the soundplayer is causing the problem
                strFile = lvi.SubItems[1].Text + ".wav";
                snd.SoundLocation = strSoundFilePath + strFile;
                System.Threading.Thread.Yield();
                System.Threading.Thread.Yield();

                snd.PlaySync();

                System.Threading.Thread.Yield();
                System.Threading.Thread.Yield();
                
                strFile = "Go" + ".wav";
                snd.SoundLocation = strSoundFilePath + strFile;
                snd.PlaySync();
                
                System.Threading.Thread.Yield();
                System.Threading.Thread.Yield();
                
                System.Threading.Thread.Yield();
                
                timer.Start();
            }
        }
    }
    
    private void timer2Tick(object sender, EventArgs e)
    {
        //this is all timer2 does.  It runs as long as the 
        //  program is running.
        runTime += 1;
        lblTotTotal.Text = (runTime / 60).ToString()
            + ":" + (runTime % 60).ToString("00");
    }
}

我正在使用VS 2017。