FileSystemWatcher停止捕获事件 [英] FileSystemWatcher stops catching events

问题描述

我正在编写一个c#程序，让我知道何时添加或删除文件.我在Windows 7机器上运行它，并在我们的网络上观看FTP服务器.

I am writing a c# program to let me know when a file has been added or deleted. I run it on my Windows 7 machine and watch an FTP server on our network.

它工作正常，但会突然停止捕获任何事件.我猜想它可能会失去与服务器的连接，或者网络中存在故障.

It works fine but will suddenly stop catching any events. I'm guessing that it might be losing connection to the server or there is a glitch in the network.

如何在代码中处理这种情况.我可以监视并尝试重新启动FileSystemWatcher对象是否存在某些异常.

How can I handle this situation in the code. Is there some exception I can watch for and try to restart the FileSystemWatcher object.

任何建议和代码示例都将不胜感激.

Any suggestions and code samples would be appreciated.

推荐答案

上一个答案不能完全解决问题，我不得不重置观察程序，而不仅仅是打开和关闭它. 我在窗口服务

The previous answer does not fix it completely, I had to reset the watcher not just turn it on and off. I use filesystemwatcher on a window service

void NotAccessibleError(FileSystemWatcher source, ErrorEventArgs e)
{
    int iMaxAttempts = 120;
    int iTimeOut = 30000;
    int i = 0;
    while ((!Directory.Exists(source.Path) || source.EnableRaisingEvents == false) && i < iMaxAttempts)
    {
        i += 1;
        try
        {
            source.EnableRaisingEvents = false;
            if (!Directory.Exists(source.Path))
            {
                MyEventLog.WriteEntry("Directory Inaccessible " + source.Path + " at " + DateTime.Now.ToString("HH:mm:ss"));
                System.Threading.Thread.Sleep(iTimeOut);
            }
            else
            { 
                // ReInitialize the Component
                source.Dispose();
                source = null;
                source = new System.IO.FileSystemWatcher();
                ((System.ComponentModel.ISupportInitialize)(source)).BeginInit();
                source.EnableRaisingEvents = true;
                source.Filter = "*.tif";
                source.Path = @"\\server\dir";
                source.NotifyFilter = System.IO.NotifyFilters.FileName;
                source.Created += new System.IO.FileSystemEventHandler(fswCatchImages_Changed);
                source.Renamed += new System.IO.RenamedEventHandler(fswCatchImages_Renamed);
                source.Error += new ErrorEventHandler(OnError);
                ((System.ComponentModel.ISupportInitialize)(source)).EndInit();
                MyEventLog.WriteEntry("Try to Restart RaisingEvents Watcher at " + DateTime.Now.ToString("HH:mm:ss"));
            }
        }
        catch (Exception error)
        {
            MyEventLog.WriteEntry("Error trying Restart Service " + error.StackTrace + " at " + DateTime.Now.ToString("HH:mm:ss"));
            source.EnableRaisingEvents = false;
            System.Threading.Thread.Sleep(iTimeOut);
        }
    }
}

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