FileSystemWatcher Changed event is raised twice

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I have an application where I am looking for a text file and if there are any changes made to the file I am using the OnChanged eventhandler to handle the event. I am using the NotifyFilters.LastWriteTime but still the event is getting fired twice. Here is the code.

public void Initialize()
{
   FileSystemWatcher _fileWatcher = new FileSystemWatcher();
  _fileWatcher.Path = "C:\\Folder";
  _fileWatcher.NotifyFilter = NotifyFilters.LastWrite;
  _fileWatcher.Filter = "Version.txt";
  _fileWatcher.Changed += new FileSystemEventHandler(OnChanged);
  _fileWatcher.EnableRaisingEvents = true;
}

private void OnChanged(object source, FileSystemEventArgs e)
{
   .......
}

In my case the OnChanged is called twice, when I change the text file version.txt and save it.

c# filesystemwatcher

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My scenario is that I have a virtual machine with a Linux server in it. I am developing files on the Windows host. When I change something in a folder on the host I want all the changes to be uploaded, synced onto the virtual server via Ftp. This is how I do eliminate the duplicate change event when I write to a file ( which flags the folder containing the file to be modified as well ) :

private Hashtable fileWriteTime = new Hashtable();

private void fsw_sync_Changed(object source, FileSystemEventArgs e)
{
    string path = e.FullPath.ToString();
    string currentLastWriteTime = File.GetLastWriteTime( e.FullPath ).ToString();

    // if there is no path info stored yet
    // or stored path has different time of write then the one now is inspected
    if ( !fileWriteTime.ContainsKey(path) ||
         fileWriteTime[path].ToString() != currentLastWriteTime
    )
    {
        //then we do the main thing
        log( "A CHANGE has occured with " + path );

        //lastly we update the last write time in the hashtable
        fileWriteTime[path] = currentLastWriteTime;
    }
}

Mainly I create a hashtable to store file write time information. Then if the hashtable has the filepath that is modified and it's time value is the same as the currently notified file's change then I know it is the duplicate of the event and ignore it.

answered 2010-08-13T07:34:38.710

FileSystemWatcher Changed event is raised twice

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