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11751666
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2012-08-01T02:07:05.073
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2012-08-01T02:07:05.073
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Here's a fairly neat observable query that seemed to work properly for me: <pre><code>var below50longerthan10seconds = subject .Select(x => x < 50) .DistinctUntilChanged() .Select(x => Observable.Delay( Observable.Return(x), TimeSpan.FromSeconds(10.0))) .Switch() .Where(x => x) .Select(x => Unit.Default); </code></pre> Here's the breakdown. Change the values from 0 to 100 to <code>true</code> when less than 50 and <code>false</code> otherwise: <pre><code> .Select(x => x < 50) </code></pre> Only keep the actual changes between <code>true</code> & <code>false</code>: <pre><code> .DistinctUntilChanged() </code></pre> Project the value into a new observable that is delayed for 10 seconds: <pre><code> .Select(x => Observable.Delay( Observable.Return(x), TimeSpan.FromSeconds(10.0))) </code></pre> Now perform a <code>.Switch()</code> - if a new <code>x</code> comes before the delayed observable then it is ignored because a new delayed observable is coming: <pre><code> .Switch() </code></pre> Select only the <code>true</code> values meaning when the original stream was below 50: <pre><code> .Where(x => x) </code></pre> Select <code>Unit.Default</code> simply because it is weird to have a stream of <code>true</code> values without any <code>false</code> values: <pre><code> .Select(x => Unit.Default); </code></pre> So now you have an <code>IObservable<Unit></code> that releases a new value when the original stream produces a value less then 50 and does not produce a value greater than or equal to 50 within 10 seconds. Is that what you wanted?
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1. PORX - How to subscribe for condition state, but only when this state doesn't change for x period of time?
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