FileSystemWatcher vs polling to watch for file changes

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I have seen the file system watcher fail in production and test environments. I now consider it a convenience, but I do not consider it reliable. My pattern has been to watch for changes with the files system watcher, but poll occasionally to catch missing file changes.

Edit: If you have a UI, you can also give your user the ability to “refresh” for changes instead of polling. I would combine this with a file system watcher.

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