FileSystemWatcher - is File ready to use

Question

When a file is being copied to the file watcher folder, how can I identify whether the file is completely copied and ready to use? Because I am getting multiple events duri

Answer 1

    private Stream ReadWhenAvailable(FileInfo finfo, TimeSpan? ts = null) => Task.Run(() =>
    {
        ts = ts == null ? new TimeSpan(long.MaxValue) : ts;
        var start = DateTime.Now;
        while (DateTime.Now - start < ts)
        {
            Thread.Sleep(200);
            try
            {
                return new FileStream(finfo.FullName, FileMode.Open);
            }
            catch { }
        }
        return null;
    })
    .Result;

...of course, you can modify aspects of this to suit your needs.