ManagementObjectSearcher导致onclick处理程序出现重新进入问题

我在保护一段代码时遇到了一个奇怪的问题。我的应用程序是一个托盘应用程序。我在类(ApplicationContext(中创建了一个NotifyIcon。我已经为NotifyIcon对象分配了一个气球单击处理程序和一个双击处理程序。还有一个上下文菜单，但我并没有显示所有代码。只有重要的部分。

 public class SysTrayApplicationContext: ApplicationContext
 {
    private NotifyIcon notifyIcon;
    private MainForm afDashBoardForm;
   public SysTrayApplicationContext()
   {
    this.notifyIcon = new NotifyIcon();
    this.notifyIcon.BalloonTipClicked += notifyIcon_BalloonTipClicked;
    this.notifyIcon.MouseDoubleClick += notifyIcon_MouseDoubleClick;
     // ... more code
   }

两个处理程序都启动或创建/显示我的表单：

        private void notifyIcon_MouseDoubleClick(object sender, MouseEventArgs e)
       {
          if (e.Button == MouseButtons.Left)
          {
              openDashboard();
          }
       }
    private void notifyIcon_BalloonTipClicked(object sender, EventArgs e)
    {
        openDashboard();
    }
    private void openDashboard()
    {
            if (dashBoardForm != null)
            {
                log.Debug("Dashboard form created already, so Activate it");
                dashBoardForm.Activate();
            }
            else
            {
                log.Debug("Dashboard form does not exist, create it");
                dashBoardForm = new MainForm();
                dashBoardForm.Show();
            }
    }

上面的代码有问题。可能超过1。问题：可以显示2个仪表板表单，这不是我想要的。如果用户在气球消息显示时双击托盘图标，则会导致openDashboard中出现竞争条件。我可以很容易地复制这个。因此，我在openDashboard代码中的代码周围添加了一个锁，令我惊讶的是，这并没有阻止2个仪表板表单的显示。我应该无法创建2个MainForms。我哪里错了？

这是带有锁定语句的更新代码：

        private void openDashboard()
        {
          lock (dashBoardFormlocker)
          {
            if (dashBoardForm != null)
            {
                log.Debug("Dashboard form created already, so Activate it");
                dashBoardForm.Activate();
            }
            else
            {
                log.Debug("Dashboard form does not exist, create it");
                dashBoardForm = new MainForm();
                dashBoardForm.Show();
            }
         }
      }

注意：锁对象已添加到类中，并在构造函数中初始化。

private object dashBoardFormlocker;

更新：显示更多代码。代码就是这样开始的：

    static void Main()
    {
        if (SingleInstance.Start())
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            XmlConfigurator.Configure();
            // For a system tray application we don't want to create 
            // a form, we instead create a new ApplicationContext.  The Run method takes
            Application.Run(new SysTrayApplicationContext());
            SingleInstance.Stop();
            SingleInstance.Dispose();
        }
    }
}

更新2：提供更多代码以提高的清晰度

public partial class MainForm : Form
{
    public MainForm()
    {
        log.Trace("MainForm constructor...");
        InitializeComponent();
        // ... code not shown
        this.label_OSVersion.Text = getOSFriendlyName();
        // .. more code
    }
    private string getOSFriendlyName()
    {
        try
        {
            string result = string.Empty;
            var mgmtObj = (from x in new ManagementObjectSearcher("SELECT Caption FROM Win32_OperatingSystem").Get().OfType<ManagementObject>()
                           select x.GetPropertyValue("Caption")).FirstOrDefault();
            result = mgmtObj != null ? mgmtObj.ToString() : string.Empty;
            OperatingSystem os = Environment.OSVersion; 
            String sp = os.ServicePack ?? string.Empty;
            return !string.IsNullOrWhiteSpace(result) ? result + sp : "Unknown";
        }
        catch (System.Exception ex)
        {
            log.Error("Error trying to get the OS version", ex);
            return "Unknown";
        }
    }
}