FileSystemWatcher Changed event is raised twice

Question

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

Answer 1

I spent some significant amount of time using the FileSystemWatcher, and some of the approaches here will not work. I really liked the disabling events approach, but unfortunately, it doesn't work if there is >1 file being dropped, second file will be missed most if not all times. So I use the following approach:

private void EventCallback(object sender, FileSystemEventArgs e)
{
    var fileName = e.FullPath;

    if (!File.Exists(fileName))
    {
        // We've dealt with the file, this is just supressing further events.
        return;
    }

    // File exists, so move it to a working directory. 
    File.Move(fileName, [working directory]);

    // Kick-off whatever processing is required.
}