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    <p>Given the problem as described - which is a little vague as I don't see what the actual id (<code>Guid</code>) is used for, nor the <code>DateTime</code> values - I've got the following query which appears to solve your problem:</p> <pre><code>IObservable&lt;bool&gt; execute = idUpdate .Publish(_idUpdate =&gt; from qsu in queryStateUpdate select qsu.Item1 ? _idUpdate.Select(x =&gt; true) : Observable.Empty&lt;bool&gt;()) .Switch(); </code></pre> <p>I've tested this with the following <code>idUpdate</code> &amp; <code>queryStateUpdate</code> observables.</p> <pre><code>var rnd = new Random(); IObservable&lt;Tuple&lt;Guid, DateTime&gt;&gt; idUpdate = Observable .Generate( 0, n =&gt; n &lt; 10000, n =&gt; n + 1, n =&gt; Tuple.Create(Guid.NewGuid(), DateTime.Now), n =&gt; TimeSpan.FromSeconds(rnd.NextDouble() * 0.1)); IObservable&lt;Tuple&lt;bool, DateTime&gt;&gt; queryStateUpdate = Observable .Generate( 0, n =&gt; n &lt; 100, n =&gt; n + 1, n =&gt; n % 2 == 0, n =&gt; TimeSpan.FromSeconds(rnd.NextDouble() * 2.0)) .StartWith(true) .DistinctUntilChanged() .Select(b =&gt; Tuple.Create(b, DateTime.Now)); </code></pre> <p>If you can provide some clarification around your problem I will probably be able to provide a better answer to suit your needs.</p> <hr> <p>EDIT: Added the "replay(1)" behaviour required when the Id changes when inactive.</p> <p>Please note that I have gotten rid of the need to have tuples with <code>DateTime</code>.</p> <pre><code>IObservable&lt;Guid&gt; idUpdate = ... IObservable&lt;bool&gt; queryStateUpdate = ... var replay = new ReplaySubject&lt;Guid&gt;(1); var disposer = new SerialDisposable(); Func&lt;bool, IObservable&lt;bool&gt;, IObservable&lt;Guid&gt;, IObservable&lt;Guid&gt;&gt; getSwitch = (qsu, qsus, iu) =&gt; { if (qsu) { return replay.Merge(iu); } else { replay.Dispose(); replay = new ReplaySubject&lt;Guid&gt;(1); disposer.Disposable = iu.TakeUntil(qsus).Subscribe(replay); return Observable.Empty&lt;Guid&gt;(); } }; var query = queryStateUpdate .DistinctUntilChanged() .Publish(qsus =&gt; idUpdate .Publish(ius =&gt; qsus .Select(qsu =&gt; getSwitch(qsu, qsus, ius)))) .Switch(); </code></pre>
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    1. COThank you very much for your help. This works for Case A. Do you have any solution for Case B? (I tried to clarify the post).
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    2. COCorrection, this seems to execute on any id update regardless of the current state.
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    3. CO@jonperl - I tested this quite a bit and it definitely didn't produce values if the state is not active during my tests. Can you give me an example where it does?
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