Watching log4net log file with FileSystemWatcher

问题:

I've created simple WPF control to monitor changes in log file. I used FileSystemWatcher to watch specific file. My configuration:

Directory = System.IO.Path.GetDirectoryName(logFileFullPath);
Filter = System.IO.Path.GetFileName(logFileFullPath);
NotifyFilter = (NotifyFilters.LastWrite | NotifyFilters.Size);
EnableRaisingEvents = true;

The problem is that changes are displayed only after refreshing the directory manually or opening log file.

I use RollingFileAppender in my log4net configuration so changes should be written immediately.

The question is: why dosn't it work and how to make it work?

EDIT :

Also when I update manually other monitored file the watcher works fine. So it must be some log4net issue.

回答1:

I've finally come up with solution. The problem had little to do with FileSystemWatcher. My log4net configuration was lacking the line:

<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />

It's still quite interesting as I had no problem with opening log file from text editor.

回答2:

Try this code,

 FileSystemWatcher watcher = new FileSystemWatcher(@"logFileDirectoryPath");     
 watcher.Filter = "LogFileNameWithExtension";
 watcher.EnableRaisingEvents = true;
 watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.Size;
 watcher.Changed += new FileSystemEventHandler(watcher_Changed);

Changed Event

 private void watcher_Changed(object sender, FileSystemEventArgs e)
 {
   //Do Something
 }