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<h1 id="reactive-extensions-rx">Reactive Extensions (Rx)</h1>
<p><a href="https://reactivex.io" title="ReactiveX website">ReactiveX</a></p>
<p>The <strong>Reactive Extensions</strong> for .NET, or <strong>Rx</strong>, are designed for working with asynchronous and event-based sources of information.
Rx provides services that help orchestrate and synchronize the way code reacts to data from these kinds of sources.</p>
<p>Rx's fundamental abstraction, <code>IObservable&lt;T&gt;</code>, represents a sequence of items, and its operators are defined as extension methods for this interface.</p>
<p>This might sound a lot like LINQ to Objects, and there are similarities, not only does <code>IObservable&lt;T&gt;</code> have a lot in common with <code>IEnumerable&lt;T&gt;</code>, but Rx also supports almost all of the standard LINQ operators.</p>
<p>The difference is that in Rx, sequences are less passive. Unlike <code>IEnumerable&lt;T&gt;</code>, Rx sources do not wait to be asked for their items, nor can the consumer
of an Rx source demand to be given the next item. Instead, Rx uses a <em>push</em> model in which <em>the source notifies</em> its recipients when items are available.</p>
<p>Because Rx implements standard LINQ operators, it's possible to write queries against a live source. Rx goes beyond standard LINQ, adding its own operators that take into account the temporal nature of a live event source.</p>
<h2 id="fundamental-interfaces">Fundamental Interfaces</h2>
<p>The two most important types in Rx are the <code>IObservable&lt;T&gt;</code> and <code>IObserver&lt;T&gt;</code> interfaces.<br />
They are important enough to be in the System namespace. The other parts of Rx are in the <code>System.Reactive</code> NuGet package.</p>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">C#</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-0-10">10</a></span>
<span class="normal"><a href="#__codelineno-0-11">11</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="k">public</span><span class="w"> </span><span class="k">interface</span><span class="w"> </span><span class="n">IObservable</span><span class="o">&lt;</span><span class="k">out</span><span class="w"> </span><span class="n">T</span><span class="o">&gt;</span>
<a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="p">{</span>
<a id="__codelineno-0-3" name="__codelineno-0-3"></a><span class="w"> </span><span class="n">IDisposable</span><span class="w"> </span><span class="nf">Subscribe</span><span class="p">(</span><span class="n">IObserver</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span><span class="w"> </span><span class="n">observer</span><span class="p">);</span>
<a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="p">}</span>
<a id="__codelineno-0-5" name="__codelineno-0-5"></a>
<a id="__codelineno-0-6" name="__codelineno-0-6"></a><span class="k">public</span><span class="w"> </span><span class="k">interface</span><span class="w"> </span><span class="n">IObserver</span><span class="o">&lt;</span><span class="k">in</span><span class="w"> </span><span class="n">T</span><span class="o">&gt;</span>
<a id="__codelineno-0-7" name="__codelineno-0-7"></a><span class="p">{</span>
<a id="__codelineno-0-8" name="__codelineno-0-8"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">OnCompleted</span><span class="p">();</span>
<a id="__codelineno-0-9" name="__codelineno-0-9"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">OnError</span><span class="p">(</span><span class="n">Exception</span><span class="w"> </span><span class="n">error</span><span class="p">);</span>
<a id="__codelineno-0-10" name="__codelineno-0-10"></a><span class="w"> </span><span class="k">void</span><span class="w"> </span><span class="nf">OnNext</span><span class="p">(</span><span class="n">T</span><span class="w"> </span><span class="k">value</span><span class="p">);</span>
<a id="__codelineno-0-11" name="__codelineno-0-11"></a><span class="p">}</span>
</code></pre></div></td></tr></table></div>
<p>The fundamental abstraction in Rx, <code>IObservable&lt;T&gt;</code>, is implemented by <em>event sources</em>. Instead of using the <code>event</code> keyword, it models events as a <em>sequence of items</em>.<br />
An <code>IObservable&lt;T&gt;</code> provides items to subscribers as and when it’s ready to do so.</p>
<p>It's possible to subscribe to a source by passing an implementation of <code>IObserver&lt;T&gt;</code> to the <code>Subscribe</code> method.
The source will invoke <code>OnNext</code> when it wants to report events, and it can call <code>OnCompleted</code> to indicate that there will be no further activity.
If the source wants to report an error, it can call <code>OnError</code>.
Both <code>OnCompleted</code> and <code>OnError</code> indicate the end of the stream, an observable should not call any further methods on the observer after that.</p>
<h2 id="operators">Operators</h2>
<h3 id="chaining-operators">Chaining Operators</h3>
<p>Most operators operate on an Observable and return an Observable. This allows to apply these operators one after the other, in a chain.
Each operator in the chain modifies the Observable that results from the operation of the previous operator.<br />
A chain of Observable operators do not operate independently on the original Observable that originates the chain,
but they operate <em>in turn</em>, each one operating on the Observable generated by the operator immediately previous in the chain.</p>
<h3 id="creating-observables">Creating Observables</h3>
<p>Operators that originate new Observables.</p>
<ul>
<li><code>Create</code>: create an Observable from scratch by calling observer methods programmatically</li>
<li><code>Defer</code>: do not create the Observable until the observer subscribes, and create a fresh Observable for each observer</li>
<li><code>Empty/Never/Throw</code>: create Observables that have very precise and limited behavior</li>
<li><code>From*</code>: convert some other object or data structure into an Observable</li>
<li><code>Interval</code>: create an Observable that emits a sequence of integers spaced by a particular time interval</li>
<li><code>Return (aka Just)</code>: convert an object or a set of objects into an Observable that emits that or those objects</li>
<li><code>Range</code>: create an Observable that emits a range of sequential integers</li>
<li><code>Repeat</code>: create an Observable that emits a particular item or sequence of items repeatedly</li>
<li><code>Start</code>: create an Observable that emits the return value of a function</li>
<li><code>Timer</code>: create an Observable that emits a single item after a given delay</li>
</ul>
<h3 id="transforming-observables">Transforming Observables</h3>
<p>Operators that transform items that are emitted by an Observable.</p>
<ul>
<li><code>Buffer</code>: periodically gather items from an Observable into bundles and emit these bundles rather than emitting the items one at a time</li>
<li><code>SelectMany (aka FlatMap)</code>: transform the items emitted by an Observable into Observables, then flatten the emissions from those into a single Observable</li>
<li><code>GroupBy</code>: divide an Observable into a set of Observables that each emit a different group of items from the original Observable, organized by key</li>
<li><code>Select (aka Map)</code>: transform the items emitted by an Observable by applying a function to each item</li>
<li><code>Scan</code>: apply a function to each item emitted by an Observable, sequentially, and emit each successive value</li>
<li><code>Window</code>: periodically subdivide items from an Observable into Observable windows and emit these windows rather than emitting the items one at a time</li>
</ul>
<h3 id="filtering-observables">Filtering Observables</h3>
<p>Operators that selectively emit items from a source Observable.</p>
<ul>
<li><code>Throttle (aka Debounce)</code>: only emit an item from an Observable if a particular timespan has passed without it emitting another item</li>
<li><code>Distinct</code>: suppress duplicate items emitted by an Observable</li>
<li><code>ElementAt</code>: emit only item n emitted by an Observable</li>
<li><code>Where (aka Filter)</code>: emit only those items from an Observable that pass a predicate test</li>
<li><code>First</code>: emit only the first item, or the first item that meets a condition, from an Observable</li>
<li><code>IgnoreElements</code>: do not emit any items from an Observable but mirror its termination notification</li>
<li><code>Last</code>: emit only the last item emitted by an Observable</li>
<li><code>Sample</code>: emit the most recent item emitted by an Observable within periodic time intervals</li>
<li><code>Skip</code>: suppress the first n items emitted by an Observable</li>
<li><code>SkipLast</code>: suppress the last n items emitted by an Observable</li>
<li><code>Take</code>: emit only the first n items emitted by an Observable</li>
<li><code>TakeLast</code>: emit only the last n items emitted by an Observable</li>
</ul>
<h3 id="combining-observables">Combining Observables</h3>
<p>Operators that work with multiple source Observables to create a single Observable</p>
<ul>
<li><code>And/Then/When</code>: combine sets of items emitted by two or more Observables by means of Pattern and Plan intermediaries</li>
<li><code>CombineLatest</code>: when an item is emitted by either of two Observables, combine the latest item emitted by each Observable via a specified function and emit items based on the results of this function</li>
<li><code>Join</code>: combine items emitted by two Observables whenever an item from one Observable is emitted during a time window defined according to an item emitted by the other Observable</li>
<li><code>Merge</code>: combine multiple Observables into one by merging their emissions</li>
<li><code>StartWith</code>: emit a specified sequence of items before beginning to emit the items from the source Observable</li>
<li><code>Switch</code>: convert an Observable that emits Observables into a single Observable that emits the items emitted by the most-recently-emitted of those Observables</li>
<li><code>Zip</code>: combine the emissions of multiple Observables together via a specified function and emit single items for each combination based on the results of this function</li>
</ul>
<h3 id="error-handling-operators">Error Handling Operators</h3>
<p>Operators that help to recover from error notifications from an Observable</p>
<ul>
<li><code>Catch</code>: recover from an onError notification by continuing the sequence without error</li>
<li><code>Retry</code>: if a source Observable sends an onError notification, resubscribe to it in the hopes that it will complete without error</li>
</ul>
<h3 id="observable-utility-operators">Observable Utility Operators</h3>
<p>A toolbox of useful Operators for working with Observables</p>
<ul>
<li><code>Delay</code>: shift the emissions from an Observable forward in time by a particular amount</li>
<li><code>Do</code>: register an action to take upon a variety of Observable lifecycle events</li>
<li><code>Materialize/Dematerialize</code>: represent both the items emitted and the notifications sent as emitted items, or reverse this process</li>
<li><code>ObserveOn</code>: specify the scheduler on which an observer will observe this Observable</li>
<li><code>Synchronize (aka Serialize)</code>: force an Observable to make serialized calls and to be well-behaved</li>
<li><code>Subscribe</code>: operate upon the emissions and notifications from an Observable</li>
<li><code>SubscribeOn</code>: specify the scheduler an Observable should use when it is subscribed to</li>
<li><code>TimeInterval</code>: convert an Observable that emits items into one that emits indications of the amount of time elapsed between those emissions</li>
<li><code>Timeout</code>: mirror the source Observable, but issue an error notification if a particular period of time elapses without any emitted items</li>
<li><code>Timestamp</code>: attach a timestamp to each item emitted by an Observable</li>
<li><code>Using</code>: create a disposable resource that has the same lifespan as the Observable</li>
</ul>
<h3 id="conditional-and-boolean-operators">Conditional and Boolean Operators</h3>
<p>Operators that evaluate one or more Observables or items emitted by Observables</p>
<ul>
<li><code>All</code>: determine whether all items emitted by an Observable meet some criteria</li>
<li><code>Amb</code>: given two or more source Observables, emit all of the items from only the first of these Observables to emit an item</li>
<li><code>Contains</code>: determine whether an Observable emits a particular item or not</li>
<li><code>DefaultIfEmpty</code>: emit items from the source Observable, or a default item if the source Observable emits nothing</li>
<li><code>SequenceEqual</code>: determine whether two Observables emit the same sequence of items</li>
<li><code>SkipUntil</code>: discard items emitted by an Observable until a second Observable emits an item</li>
<li><code>SkipWhile</code>: discard items emitted by an Observable until a specified condition becomes false</li>
<li><code>TakeUntil</code>: discard items emitted by an Observable after a second Observable emits an item or terminates</li>
<li><code>TakeWhile</code>: discard items emitted by an Observable after a specified condition becomes false</li>
</ul>
<h3 id="mathematical-and-aggregate-operators">Mathematical and Aggregate Operators</h3>
<p>Operators that operate on the entire sequence of items emitted by an Observable</p>
<ul>
<li><code>Average</code>: calculates the average of numbers emitted by an Observable and emits this average</li>
<li><code>Concat</code>: emit the emissions from two or more Observables without interleaving them</li>
<li><code>Count</code>: count the number of items emitted by the source Observable and emit only this value</li>
<li><code>Max</code>: determine, and emit, the maximum-valued item emitted by an Observable</li>
<li><code>Min</code>: determine, and emit, the minimum-valued item emitted by an Observable</li>
<li><code>Aggregate (aka Reduce)</code>: apply a function to each item emitted by an Observable, sequentially, and emit the final value</li>
<li><code>Sum</code>: calculate the sum of numbers emitted by an Observable and emit this sum</li>
</ul>
<h3 id="connectable-observable-operators">Connectable Observable Operators</h3>
<p>Specialty Observables that have more precisely-controlled subscription dynamics</p>
<ul>
<li><code>Connect</code>: instruct a connectable Observable to begin emitting items to its subscribers</li>
<li><code>Publish</code>: convert an ordinary Observable into a connectable Observable</li>
<li><code>RefCount</code>: make a Connectable Observable behave like an ordinary Observable</li>
<li><code>Replay</code>: ensure that all observers see the same sequence of emitted items, even if they subscribe after the Observable has begun emitting items</li>
</ul>
<h3 id="operators-to-convert-observables">Operators to Convert Observables</h3>
<ul>
<li><code>To*</code>: convert an Observable into another object or data structure</li>
</ul>
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