C＃中的文件系统监视器

问题描述：

目前我有一个Windows服务，它不断监视4个文件夹。我已经使用FileSystemWatchers来监视文件夹。C＃中的文件系统监视器

但是每次添加新文件夹时，我都要卸载服务添加一个新的filesystemwatcher然后安装服务。

我想让它动态或数据库驱动，我不需要卸载并重新安装服务，每次程序需要监视一个新的文件夹。

我该如何做到这一点？

在此先感谢。

答

在这里，你有一个使用XML与Linq2XML和拥有的配置文件更改支票演示：

class Program 
{ 
    static List<FileSystemWatcher> _watchers = new List<FileSystemWatcher>(); 
    static bool _shouldReload = false; 

    static void WaitReady(string fileName) 
    { 
     while (true) 
     { 
      try 
      { 
       using (Stream stream = System.IO.File.Open(fileName, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) 
       { 
        if (stream != null) 
        { 
         System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} ready.", fileName)); 
         break; 
        } 
       } 
      } 
      catch (FileNotFoundException ex) 
      { 
       System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", fileName, ex.Message)); 
      } 
      catch (IOException ex) 
      { 
       System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", fileName, ex.Message)); 
      } 
      catch (UnauthorizedAccessException ex) 
      { 
       System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", fileName, ex.Message)); 
      } 
      Thread.Sleep(500); 
     } 
    } 

    static void Main(string[] args) 
    { 
     var configWatcher = new FileSystemWatcher(Path.GetDirectoryName(Path.GetFullPath("config.xml")), "config.xml"); 
     configWatcher.Changed += (o, e) => 
     { 
      lock (_watchers) 
      { 
       _watchers.ForEach(w => { w.EnableRaisingEvents = false; w.Dispose(); }); 
       _watchers.Clear(); 
      } 

      _shouldReload = true; 
     }; 

     configWatcher.EnableRaisingEvents = true; 

     Thread t = new Thread((ThreadStart)(() => { 
      while (true) 
      { 
       Thread.Sleep(5000); // reload only every five seconds (safety measure) 
       if (_shouldReload) 
       { 
        _shouldReload = false; 
        Console.WriteLine("Reloading configuration."); 
        WaitReady(Path.GetFullPath("config.xml")); 
        loadConfigAndRun(); 
       } 
      } 
     })); 

     t.IsBackground = true; 
     t.Start(); 

     loadConfigAndRun(); 

     Console.ReadLine(); 
    } 

    static void loadConfigAndRun() 
    { 
     var config = XElement.Load("config.xml").Elements(); 
     var paths = from watcher in config select watcher.Attribute("Folder").Value; 

     foreach (var path in paths) 
     { 
      var watcher = new FileSystemWatcher(path); 
      watcher.Created += new FileSystemEventHandler(watcher_Changed); 
      watcher.Changed += new FileSystemEventHandler(watcher_Changed); 
      watcher.Deleted += new FileSystemEventHandler(watcher_Changed); 
      watcher.Renamed += new RenamedEventHandler(watcher_Renamed); 
      watcher.EnableRaisingEvents = true; 
      _watchers.Add(watcher); 
     } 
    } 

    static void toggleWatcher(string path) 
    { 
     var watcher = _watchers.FirstOrDefault(w => w.Path == path); 

     if (watcher != null) 
     { 
      watcher.EnableRaisingEvents = !watcher.EnableRaisingEvents; 
     } 
    } 

    static void watcher_Renamed(object sender, RenamedEventArgs e) 
    { 
     var watcher = sender as FileSystemWatcher; 

     Console.WriteLine("Something renamed in " + watcher.Path); 
    } 

    static void watcher_Changed(object sender, FileSystemEventArgs e) 
    { 
     var watcher = sender as FileSystemWatcher; 

     Console.WriteLine("Something changed in " + watcher.Path); 
    } 
}

这是config.xml文件：

<?xml version="1.0" encoding="utf-8" ?> 
<Watchers> 
    <Watcher Folder="d:\ktm"></Watcher> 
    <Watcher Folder="c:\windows"></Watcher> 
</Watchers>

答

您可以使用应用程序定期读取和缓存新文件夹的XML配置文件。这些将在app.settings文件中进行。

<configuration> 
    <appSettings> 
     <add key = "FolderToWatch" value = "C:\SomeFolder\" /> 
     <add key = "FolderToWatch" value = "C:\SomeFolder\AnotherOne\" /> 
     <add key = "FolderToWatch" value = "D:\LastOne\" /> 
    </appSettings> 
</configuration>

通过21秒打我。 .. – AllenG

答

使用配置文件添加您的新位置。然后，只需要在将新位置添加到配置文件时重新启动服务即可。

答

我会使用.YML建议的.xml文件，但是，我只会看.xml文件。服务启动时加载.xml文件，然后监视.xml文件以进行更改;如果LastWriteTime的.xml文件发生更改，请重新加载它。

C＃中的文件系统监视器

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