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    <p>Just to warm up an old topic, as I'm working on that right now, too: </p> <p>Of course this topic is negligible in the context of watching one file, as FileSystemWatcher only fires every ~3 seconds with a Changed event for a single file when you track Size via</p> <pre><code>_fileSystemWatcher.NotifyFilter = NotifyFilters.Size | .... </code></pre> <p>But let's assume FileSystemWatcher would fire many events in a row (maybe many files are changed/renamed/created), and other people read this:</p> <p>You don't want to use Throttle or BufferWithTime in this case: <code>Throttle</code> is a bit misleading.. it prohibits any firing until TimeSpan time is elapsed <em>without</em> an event. Meaning: it could never fire when you use something like <code>Throttle(TimeSpan.FromMilliseconds(200))</code>, and after every event there is a pause &lt; 200 ms. So it's not really the "throttling" people expect. It's good for user input, when you want to wait until the user has stopped typing something. It's bad for load throttling.</p> <p><code>BufferWithTime</code> is also not what you want: it just fills a timebuffer. Good when you have a high initial load per event, like opening a connection to a webservice. In that case you would want to batch process events every "time" seconds. But not when loadbalancing, as the number of events don't change.</p> <p>The solution is the <code>Sample(TimeSpan time)</code> method: it takes the last event within a TimeSpan, which is the "real" Throttle. I think the Rx guys really messed up the naming in this case.</p>
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    1. COThanks for warming this up, I had kept sample code handy for that problem and bothered to look and I had .Sample in my code. I'd care to know if watching for file size guarantees you will get an event in the case the file is changed without altering it's size?
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    2. CO@DavidGrenier tried it, it only fires on NotifyFilter.LastWrite in that case. But that's part of the standard filter, which is LastWrite | FileName | DirectoryName, so you have to add the "watching for size change" manually. So I use at least NF.LastWrite | NF.Size
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