c# winform多线程死循环踩坑

private async void ReadPlcData1()
{
    while (true)
    {
        try
        {
            stopwatch1 = Stopwatch.StartNew();
            plcData1[0] = await readOmronData.ReadOneOmronData(FrmMain.omronCipNet1, "s_SysStrip1.Status.Homed", "BOOL");
            plcData1[1] = await readOmronData.ReadOneOmronData(FrmMain.omronCipNet1, "s_SysStrip1.Status.Homing", "BOOL");
            plcData1[2] = await readOmronData.ReadOneOmronData(FrmMain.omronCipNet1, "s_SysStrip1.Status.ErrHome", "BOOL");
            plcData1[3] = await readOmronData.ReadOneOmronData(FrmMain.omronCipNet1, "s_SysStrip1.Status.MoveDone", "BOOL");
            .......
            plcData1[49] = await readOmronData.ReadOneOmronData(FrmMain.omronCipNet1, "s_SysStrip1Move.Cmd.Pos.JogVel", "REAL");
            for(int i = 0; i < 50; i++)
            {
                string labelName = $"label{i+1}";
                Control[] labels = Controls.Find(labelName, true);
                foreach (var label in labels)//修改label
                {
                    if (label.Name == labelName)
                    {
                        Invoke(new Action(() =>
                        {
                            label.Text = plcData1[i].ToString();
                        }));
                    }
                }
            }
            stopwatch1.Stop();
            TimeSpan elapsed = stopwatch1.Elapsed;
            Invoke(new Action(() =>
            {
                RecvCount++;
                tb_recvCount.Text = RecvCount.ToString();
                tb_timeSpan1.Text = elapsed.TotalMilliseconds.ToString();
            }));
        }
        catch (Exception ex)
        {
            //MessageBox.Show(ex.Message, "HomeReadData");
        }
    }
}

private void StartThreadReadPlcData1()
{
      // 启动线程
      threadReadPlcData1 = new System.Threading.Thread(new System.Threading.ThreadStart(ReadPlcData1));
      threadReadPlcData1.IsBackground = true;
      threadReadPlcData1.Start();

      // 启动线程
      threadReadPlcData2 = new System.Threading.Thread(new System.Threading.ThreadStart(ReadPlcData2));
      threadReadPlcData2.IsBackground = true;
      threadReadPlcData2.Start();

      // 启动线程
      threadReadPlcData3 = new System.Threading.Thread(new System.Threading.ThreadStart(ReadPlcData3));
      threadReadPlcData3.IsBackground = true;
      threadReadPlcData3.Start();
  }

private void FrmMenu_FormClosing(object sender, FormClosingEventArgs e)
{
    for (int i = 0; i < stopThreadFlag.Length; i++)
    {
        stopThreadFlag[i] = true;
    }
}