监测新的文件创建一个目录，而FileSystemWatcher的 [英] Monitoring a directory for new file creation without FileSystemWatcher

问题描述

我要创建一个Windows服务，监视指定文件夹中的新文件和进程，并将其移动到其他位置。

I have to create a Windows service which monitors a specified folder for new files and processes it and moves it to other location.

我开始使用 FileSystemWatcher的。我的老板不喜欢 FileSystemWatcher的，并要我用定时器或比<以外的任何其他机制来使用轮询code> FileSystemWatcher的。

I started with using FileSystemWatcher. My boss doesn't like FileSystemWatcher and wants me to use polling by using a Timer or any other mechanism other than FileSystemWatcher.

您如何监控directorying不使用 FileSystemWatcher的使用.NET Framework？

How can you monitor directorying without using FileSystemWatcher using .NET framework?

推荐答案

使用@ Petoj的答案我已经包含了完整的Windows服务，轮询每五分钟的新文件。它contrained所以只有一个线程投票，占处理时间，并支持暂停和停止及时。它还支持debbugger对system.start容易附着

Using @Petoj's answer I've included a full windows service that polls every five minutes for new files. Its contrained so only one thread polls, accounts for processing time and supports pause and timely stopping. It also supports easy attaching of a debbugger on system.start

 public partial class Service : ServiceBase{


    List<string> fileList = new List<string>();

    System.Timers.Timer timer;


    public Service()
    {
        timer = new System.Timers.Timer();
        //When autoreset is True there are reentrancy problems.
        timer.AutoReset = false;

        timer.Elapsed += new System.Timers.ElapsedEventHandler(DoStuff);
    }


    private void DoStuff(object sender, System.Timers.ElapsedEventArgs e)
    {
       LastChecked = DateTime.Now;

       string[] files = System.IO.Directory.GetFiles("c:\\", "*", System.IO.SearchOption.AllDirectories);

       foreach (string file in files)
       {
           if (!fileList.Contains(file))
           {
               fileList.Add(file);

               do_some_processing();
           }
       }


       TimeSpan ts = DateTime.Now.Subtract(LastChecked);
       TimeSpan MaxWaitTime = TimeSpan.FromMinutes(5);

       if (MaxWaitTime.Subtract(ts).CompareTo(TimeSpan.Zero) > -1)
           timer.Interval = MaxWaitTime.Subtract(ts).TotalMilliseconds;
       else
           timer.Interval = 1;

       timer.Start();
    }

    protected override void OnPause()
    {
        base.OnPause();
        this.timer.Stop();
    }

    protected override void OnContinue()
    {
        base.OnContinue();
        this.timer.Interval = 1;
        this.timer.Start();
    }

    protected override void OnStop()
    {
        base.OnStop();
        this.timer.Stop();
    }

    protected override void OnStart(string[] args)
    {
       foreach (string arg in args)
       {
           if (arg == "DEBUG_SERVICE")
                   DebugMode();

       }

        #if DEBUG
            DebugMode();
        #endif

        timer.Interval = 1;
        timer.Start();
   }

   private static void DebugMode()
   {
       Debugger.Break();
   }

 }

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