Using FileSystemWatcher with multiple files

Question

I want to use FileSystemWatcher to monitor a directory and its subdirectories for files that are moved. And then I want to trigger some code when all the files have been mov

Answer 1

Rx - throttle - makes this job easy. Here is a testable, reusable solution.

public class Files
{
     public static FileSystemWatcher WatchForChanges(string path, string filter, Action triggeredAction)
            {
                var monitor = new FileSystemWatcher(path, filter);

                //monitor.NotifyFilter = NotifyFilters.FileName;
                monitor.Changed += (o, e) => triggeredAction.Invoke();
                monitor.Created += (o, e) => triggeredAction.Invoke();
                monitor.Renamed += (o, e) => triggeredAction.Invoke();
                monitor.EnableRaisingEvents = true;

                return monitor;
            }
}

Lets merge events into a single sequence

  public IObservable OnUpdate(string path, string pattern)
        {
            return Observable.Create(o =>
            {
                var watcher = Files.WatchForChanges(path, pattern, () => o.OnNext(new Unit()));

                return watcher;
            });
        }

then finally, the usage

OnUpdate(path, "*.*").Throttle(Timespan.FromSeconds(10)).Subscribe(this, _ => DoWork())

u can obviously play with the throttle speed to suit your needs.