c# - 运行 Windows 服务以观察服务运行增长内存(泄漏)

Question

我已经检查了这里的所有帖子，但到目前为止找不到适合我的解决方案。我确实设置了一个小服务，它应该只监视我要监视的其他服务是否运行，如果没有运行，则重新启动它并在应用程序事件日志中放置一条消息。

该服务本身运行良好，没什么特别的 :)，但是当我启动该服务时，它使用大约 1.6MB 的 RAM，并且每 10 秒它增长 60-70k，这足以忍受它。我尝试处理并清除所有资源。尝试使用 System.Timers 而不是实际的解决方案，但没有任何效果如我所愿，内存仍在增长。

调试或发布版本没有区别，我在 .Net 2 上使用它，不知道它对你 3、3.5 或 4 是否有影响。

有什么提示吗？!

using System;
using System.IO;
using System.Diagnostics;
using System.ServiceProcess;
using System.Threading;
using System.Timers;

namespace Watchguard
{
  class WindowsService : ServiceBase
  {

    Thread mWorker;
    AutoResetEvent mStop = new AutoResetEvent(false);

    /// <summary>
    /// Public Constructor for WindowsService.
    /// - Put all of your Initialization code here.
    /// </summary>
    public WindowsService()
    {
        this.ServiceName = "Informer Watchguard";
        this.EventLog.Source = "Informer Watchguard";
        this.EventLog.Log = "Application";

      // These Flags set whether or not to handle that specific
        //  type of event. Set to true if you need it, false otherwise.
        this.CanHandlePowerEvent = false;
        this.CanHandleSessionChangeEvent = false;
        this.CanPauseAndContinue = false;
        this.CanShutdown = false;
        this.CanStop = true;

        if (!EventLog.SourceExists("Informer Watchguard"))
          EventLog.CreateEventSource("Informer Watchguard", "Application");
    }

    /// <summary>
    /// The Main Thread: This is where your Service is Run.
    /// </summary>
    static void Main()
    {
        ServiceBase.Run(new WindowsService());
    }

    /// <summary>
    /// Dispose of objects that need it here.
    /// </summary>
    /// <param name="disposing">Whether or not disposing is going on.</param>
    protected override void Dispose(bool disposing)
    {
        base.Dispose(disposing);
    }

    /// <summary>
    /// OnStart: Put startup code here
    ///  - Start threads, get inital data, etc.
    /// </summary>
    /// <param name="args"></param>
    protected override void OnStart(string[] args)
    {

      base.OnStart(args);

      MyLogEvent("Init");

      mWorker = new Thread(WatchServices);
      mWorker.Start();

    }

    /// <summary>
    /// OnStop: Put your stop code here
    /// - Stop threads, set final data, etc.
    /// </summary>
    protected override void OnStop()
    {

      mStop.Set();
      mWorker.Join();

      base.OnStop();

    }

    /// <summary>
    /// OnSessionChange(): To handle a change event from a Terminal Server session.
    ///   Useful if you need to determine when a user logs in remotely or logs off,
    ///   or when someone logs into the console.
    /// </summary>
    /// <param name="changeDescription"></param>
    protected override void OnSessionChange(SessionChangeDescription changeDescription)
    {
      base.OnSessionChange(changeDescription);
    }

    private void WatchServices()
    {

      string scName = "";

      ServiceController[] scServices;
      scServices = ServiceController.GetServices();

      for (; ; )
      {
        // Run this code once every 10 seconds or stop right away if the service is stopped
        if (mStop.WaitOne(10000)) return;
        // Do work...
        foreach (ServiceController scTemp in scServices)
        {

          scName = scTemp.ServiceName.ToString().ToLower();

          if (scName == "InformerWatchguard") scName = ""; // don't do it for yourself

          if (scName.Length > 8) scName = scName.Substring(0, 8);

          if (scName == "informer")
          {

            ServiceController sc = new ServiceController(scTemp.ServiceName.ToString());

            if (sc.Status == ServiceControllerStatus.Stopped)
            {

              sc.Start();
              MyLogEvent("Found service " + scTemp.ServiceName.ToString() + " which has status: " + sc.Status + "\nRestarting Service...");

            }

            sc.Dispose();
            sc = null;

          }
        }
      }

    }

    private static void MyLogEvent(String Message)
    {
      // Create an eEventLog instance and assign its source.
      EventLog myLog = new EventLog();
      myLog.Source = "Informer Watchguard";

      // Write an informational entry to the event log.
      myLog.WriteEntry(Message);
    }
  }
}

Answer 1

您的代码可能会在循环内抛出异常，但这些异常不会被捕获。因此，将代码更改如下以捕获异常:

if (scName == "informer")
{
    try {
        using(ServiceController sc = new ServiceController(scTemp.ServiceName.ToString())) {
            if (sc.Status == ServiceControllerStatus.Stopped)
            {
                sc.Start();
                MyLogEvent("Found service " + scTemp.ServiceName.ToString() + " which has status: " + sc.Status + "\nRestarting Service...");
            }
        }
    } catch {
        // Write debug log here
    }
}

您可以在调查后删除外部 try/catch，留下 using 语句以确保即使内部抛出异常也会调用 Dispose。