使用FileSystemWatcher监控网络路径(含源码下载)

cobra - 2008-5-31 6:31:00

文/binbin1845 出处/博客园

.Net里面有个FileSystemWatcher控件，用来监控文件变化，它会通知文件创建，修改，删除的消息。网上这样的例子很多，但是在实际应用的时候，发现还有一些待处理的问题，我做了一个简单的demo，解决了如下的问题：
1. 多次连续触发 (通过一个定时器来解决）
2. 能监控网路路径 (serviceProcessInstaller的Account属性设置为NetworkService)
3. 通过windows service来实现, 做成安装文件方便注册服务

注意事项：
1. 切记网络路径要给guest的权限，否则监控不了。
2. 修改Service1代码中的watcher.Path。
3. 新建文件c:\test.log，将此文件设置为可写的权限。
4. 安装完成后手动将服务启动。

关键代码：

Code

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CODE:

public class AdvancedFileSystemWatcher : System.IO.FileSystemWatcher
{
public event NetworkPathUnavailableEventHandler NetworkPathUnavailable;
public delegate void NetworkPathUnavailableEventHandler(string Message);
public event NetworkPathAvailableEventHandler NetworkPathAvailable;
public delegate void NetworkPathAvailableEventHandler(string Message);
private System.Timers.Timer _myTimer = new System.Timers.Timer();
private bool _isNetworkUnavailable = false;

public AdvancedFileSystemWatcher()
{
_myTimer.Start();
}

public AdvancedFileSystemWatcher(int iNetworkWatchInterval)
{
if (iNetworkWatchInterval > 0)
{
_myTimer.Interval = iNetworkWatchInterval;
}
else
{
_myTimer.Interval = 2000;
}
_myTimer.Start();

}

public void close()
{
_myTimer.Stop();
_myTimer.Dispose();

}

private void _myTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
DirectoryInfo myFolder;

try
{
myFolder = new DirectoryInfo(base.Path);
if (!_isNetworkUnavailable)
{
if (!myFolder.Exists)
{
_isNetworkUnavailable = true;
if (NetworkPathUnavailable != null)
{
NetworkPathUnavailable("A network error has occured or the path does not exist anymore");
}
}
}
else
{
if (myFolder.Exists)
{
_isNetworkUnavailable = false;
if (NetworkPathAvailable != null)
{
NetworkPathAvailable("The network or path has been restored");
}
}
}
}
catch (Exception ex)
{
throw;
}
finally
{
myFolder = null;
}

}

}

源代码下载：