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64.041S0 451.328 0 415.959s28.672-64.041 64.041-64.041s64.04 28.673 64.04 64.041m175.66 47.25c-8.354-154.6-132.185-278.587-286.95-286.95C7.656 175.765 0 183.105 0 192.253v48.069c0 8.415 6.49 15.472 14.887 16.018c111.832 7.284 201.473 96.702 208.772 208.772c.547 8.397 7.604 14.887 16.018 14.887h48.069c9.149.001 16.489-7.655 15.995-16.79m144.249.288C439.596 229.677 251.465 40.445 16.503 32.01C7.473 31.686 0 38.981 0 48.016v48.068c0 8.625 6.835 15.645 15.453 15.999c191.179 7.839 344.627 161.316 352.465 352.465c.353 8.618 7.373 15.453 15.999 15.453h48.068c9.034-.001 16.329-7.474 16.005-16.504\"\u002F>",{"id":40,"title":41,"author":42,"body":43,"comments":297,"date":428,"dateModified":429,"description":430,"extension":431,"headings":432,"heroImage":437,"meta":438,"path":55,"permalink":55,"published":439,"stem":440,"tags":441,"timeToRead":447},"posts\u002Fposts\u002F2014\u002Freactive-extensions-part1-replacing-events\u002Findex.md","Reactive Extensions (Rx) - Part 1 - Replacing C# Events","Muhammad Rehan Saeed",{"type":44,"value":45,"toc":294},"minimark",[46,99,113,116,139,142,149,152,155,182,185,188,191,198,201,204,207,210,221,224,227,238,241,244,258,261,273,284,290],[47,48,49,57,63,69,75,81,87,93],"ol",{},[50,51,52],"li",{},[53,54,56],"a",{"href":55},"\u002Freactive-extensions-part1-replacing-events\u002F","Reactive Extensions (Rx) - Replacing C# Events",[50,58,59],{},[53,60,62],{"href":61},"\u002Freactive-extensions-part2-wrapping-events\u002F","Reactive Extensions (Rx) - Wrapping C# Events",[50,64,65],{},[53,66,68],{"href":67},"\u002Freactive-extensions-part3-naming-conventions\u002F","Reactive Extensions (Rx) - Naming Conventions",[50,70,71],{},[53,72,74],{"href":73},"\u002Freactive-extensions-part4-replacing-timers\u002F","Reactive Extensions (Rx) - Replacing Timers",[50,76,77],{},[53,78,80],{"href":79},"\u002Freactive-extensions-part5-awaiting-observables\u002F","Reactive Extensions (Rx) - Awaiting Observables",[50,82,83],{},[53,84,86],{"href":85},"\u002Freactive-extensions-part6-task-toobservable\u002F","Reactive Extensions (Rx) - Task ToObservable",[50,88,89],{},[53,90,92],{"href":91},"\u002Freactive-extensions-part7-sample-events\u002F","Reactive Extensions (Rx) - Sample Events",[50,94,95],{},[53,96,98],{"href":97},"\u002Freactive-extensions-rx-part-8-timeouts\u002F","Reactive Extensions (Rx) - Timeouts",[100,101,102,103,112],"p",{},"For those who have not tried Reactive Extensions (Rx) yet, I highly recommend it. If I had to describe it in a few words it would be 'Linq to events'. If you have not already learned about it, ",[53,104,111],{"href":105,"rel":106,"target":110},"http:\u002F\u002Fwww.introtorx.com\u002Fuat\u002Fcontent\u002Fv1.0.10621.0\u002F00_Foreword.html",[107,108,109],"nofollow","noopener","noreferrer","_blank","this"," is by far the best resource on learning its intricacies.",[100,114,115],{},"I have spent a lot of time reading about Reactive Extensions but what I have not found in my research is examples or pointers on how or even where it should be used in preference to other code. One area where you should definitely consider using Reactive Extensions is as a direct replacement for bog standard C# events, which have been around since C# 1.0. This post will explain how.",[117,118,120,138],"h1",{"id":119},"exposing-an-event",[53,121,124],{"href":122,"aria-hidden":123},"#exposing-an-event","true",[125,126,132],"svg",{"xmlns":127,"xmlns:xlink":128,"viewBox":129,"version":130,"width":131,"height":131,"aria-hidden":123},"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","http:\u002F\u002Fwww.w3.org\u002F1999\u002Fxlink","0 0 16 16","1.1",22,[133,134],"path",{"fill":135,"fill-rule":136,"d":137},"currentColor","evenodd","M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z","Exposing an Event",[100,140,141],{},"Here is an example of a standard C# event using the standard recommended pattern:",[143,144],"pre",{"className":145,"language":146,"meta":147,"style":147,"html":148},"language-cs shiki shiki-themes light-plus monokai","cs","","\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> class\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> JetFighter\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> event\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> EventHandler\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighterEventArgs\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> SpotPlane\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">        EventHandler\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighterEventArgs\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">eventHandler\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">        if\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">eventHandler\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> !=\u003C\u002Fspan>\u003Cspan class=\"sMc8R\"> null\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sWm5y\">            eventHandler\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sK46n\">this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sJvqV\">new\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> JetFighterEventArgs\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">));\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,150,151],{},"Now this is how you replace it using Reactive Extensions:",[143,153],{"className":145,"language":146,"meta":147,"style":147,"html":154},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> class\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> JetFighter\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Subject\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> new\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Subject\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">AsObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> SpotPlane\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnNext\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,156,157,158,162,163,166,167,170,171,174,175,177,178,181],{},"So far it's all pretty straightforward, we have replaced the event with a property returning ",[159,160,161],"code",{},"IObservable\u003CT>",". Raising the event is a simple matter of calling the ",[159,164,165],{},"OnNext"," method on the Subject class. Finally, we do not return our ",[159,168,169],{},"Subject\u003CT>"," directly in our ",[159,172,173],{},"PlaneSpotted"," property, as someone could cast it back to ",[159,176,169],{}," and raise their own events! Instead we use the ",[159,179,180],{},"AsObservable"," method which returns a middle man. So far so good.",[100,183,184],{},"Reactive Extensions also has the added concept of errors and completion, which C# events do not have. These are optional added concepts and not required for replacing C# events directly but worth knowing about, as they add an extra dimension to events which may be useful to you.",[100,186,187],{},"The first concept is dealing with errors. What happens if there is an exception while you are spotting the plane and you want to notify your subscribers that there is a problem? Well you can do that, like this:",[143,189],{"className":145,"language":146,"meta":147,"style":147,"html":190},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> SpotPlane\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    try\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">        if\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Equals\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Name\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"UFO\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">            throw\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> new\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Exception\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"UFO Found\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnNext\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    catch\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Exception\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> exception\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnError\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">exception\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,192,193,194,197],{},"Here we are using the ",[159,195,196],{},"OnError"," method to notify all the events subscribers that there has been an exception.",[100,199,200],{},"So what about the concept of completion? Well, that's just as simple. Suppose that you have spotted all the planes and you want to notify all your subscribers that there will be no more spotted planes. You can do that like this:",[143,202],{"className":145,"language":146,"meta":147,"style":147,"html":203},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> AllPlanesSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnCompleted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,205,206],{},"So now all the code put together looks like this:",[143,208],{"className":145,"language":146,"meta":147,"style":147,"html":209},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> class\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> JetFighter\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Subject\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> new\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Subject\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> AllPlanesSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnCompleted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> SpotPlane\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">        try\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">            if\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Equals\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Name\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"UFO\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">                throw\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> new\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Exception\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"UFO Found\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">            this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnNext\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">        catch\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Exception\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> exception\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">            this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">OnError\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">exception\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[117,211,213,220],{"id":212},"consuming-an-event",[53,214,216],{"href":215,"aria-hidden":123},"#consuming-an-event",[125,217,218],{"xmlns":127,"xmlns:xlink":128,"viewBox":129,"version":130,"width":131,"height":131,"aria-hidden":123},[133,219],{"fill":135,"fill-rule":136,"d":137},"Consuming an Event",[100,222,223],{},"Consuming the Reactive Extensions events is just as easy and this is where you start to see the real benefits of Reactive Extensions. This is how you subscribe and unsubscribe (often forgotten, which can lead to memory leaks) to a standard C# event:",[143,225],{"className":145,"language":146,"meta":147,"style":147,"html":226},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> class\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> BomberControl\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> : \u003C\u002Fspan>\u003Cspan class=\"sw29p\">IDisposable\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> BomberControl\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">        jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> +=\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">OnPlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> Dispose\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">        jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> -=\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">OnPlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> OnPlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">object\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> sender\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighterEventArgs\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> e\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">        JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> spottedPlane\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> e\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">SpottedPlane\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,228,229,230,233,234,237],{},"I'm not going to go into it in too much detail, you subscribe using ",[159,231,232],{},"+="," and unsubscribe using ",[159,235,236],{},"-="," operators.",[100,239,240],{},"This is how the same thing can be accomplished using Reactive Extensions:",[143,242],{"className":145,"language":146,"meta":147,"style":147,"html":243},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> class\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> BomberControl\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> : \u003C\u002Fspan>\u003Cspan class=\"sw29p\">IDisposable\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> IDisposable\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> planeSpottedSubscription\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> BomberControl\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">. \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpottedSubscription\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Subscribe\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sK46n\">this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">OnPlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> Dispose\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">planeSpottedSubscription\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Dispose\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> OnPlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetFighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">        JetFighter\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> spottedPlane\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,245,246,247,250,251,254,255,257],{},"The key things to note here are first, the use of the ",[159,248,249],{},"Subscribe"," method to register for plane spotted events. Second, the subscription to the event is stored in an ",[159,252,253],{},"IDisposable"," which can later be disposed of, to un-register from the event. This is where things get interesting, since we now have an ",[159,256,161],{}," we can now use all kinds of Linq queries on it like this:",[143,259],{"className":145,"language":146,"meta":147,"style":147,"html":260},"\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">jetfighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">PlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Where\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Equals\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Name\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, “\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Eurofighter\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">”)).\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Subscribe\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sK46n\">this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">OnPlaneSpotted\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>",[100,262,263,264,267,268,272],{},"So in the above line of code, I'm using a Linq query to only register to events where the name of the spotted plane is ",[159,265,266],{},"Eurofighter",". There are a lot more Linq methods you can use but that's beyond the scope of this post and also where you should take a look at ",[53,269,271],{"href":105,"rel":270,"target":110},[107,108,109],"this website",".",[117,274,276,283],{"id":275},"conclusions",[53,277,279],{"href":278,"aria-hidden":123},"#conclusions",[125,280,281],{"xmlns":127,"xmlns:xlink":128,"viewBox":129,"version":130,"width":131,"height":131,"aria-hidden":123},[133,282],{"fill":135,"fill-rule":136,"d":137},"Conclusions",[100,285,286,287,289],{},"Reactive Extensions (Rx) is a pretty large library which does a lot of stuff which overlaps with other libraries like the Task Parallel Library (TPL). It brings no new capabilities but does bring new ways to do things (much like Linq), while writing less code and with more elegance. It can be confusing coming to it as a newcomer, as to where exactly it can be used effectively. Replacing basic events with ",[159,288,161],{}," is definitely one area where we can leverage its power.",[291,292,293],"style",{},"html pre.shiki code .sJvqV, html code.shiki .sJvqV{--shiki-default:#0000FF;--shiki-dark:#F92672}html pre.shiki code .s4J9F, html code.shiki .s4J9F{--shiki-default:#0000FF;--shiki-default-font-style:inherit;--shiki-dark:#66D9EF;--shiki-dark-font-style:italic}html pre.shiki code .sw29p, html code.shiki .sw29p{--shiki-default:#267F99;--shiki-default-text-decoration:inherit;--shiki-dark:#A6E22E;--shiki-dark-text-decoration:underline}html pre.shiki code .sjLUg, html code.shiki .sjLUg{--shiki-default:#000000;--shiki-dark:#F8F8F2}html pre.shiki code .sFrd5, html code.shiki .sFrd5{--shiki-default:#001080;--shiki-dark:#F8F8F2}html pre.shiki code .sWm5y, html code.shiki .sWm5y{--shiki-default:#795E26;--shiki-dark:#A6E22E}html pre.shiki code .snCLD, html code.shiki .snCLD{--shiki-default:#000000;--shiki-dark:#F92672}html pre.shiki code .sK46n, html code.shiki .sK46n{--shiki-default:#0000FF;--shiki-dark:#FD971F}html pre.shiki code .smL5M, html code.shiki .smL5M{--shiki-default:#AF00DB;--shiki-dark:#F92672}html pre.shiki code .sMc8R, html code.shiki .sMc8R{--shiki-default:#0000FF;--shiki-dark:#AE81FF}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .swiDo, html code.shiki .swiDo{--shiki-default:#A31515;--shiki-dark:#E6DB74}",{"title":147,"searchDepth":295,"depth":295,"links":296},2,[],{"issue":298,"comments":302},{"number":299,"title":300,"html_url":301},103,"[Comment] Reactive Extensions (Rx) - Part 1 - Replacing C# Events","https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103",[303,315,323,331,340,348,356,364,372,380,388,396,404,412,420],{"id":304,"html_url":305,"body_html":306,"created_at":307,"updated_at":307,"author_association":308,"user":309,"reactions":313},627271291,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271291","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F4408e8a1e4c33f65b5f3609854b45dd86f25405155ccbc343274ad3afd5ff56f\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f36383635373238326566313866343934326338616239313737303537643837363f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Tony\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F4408e8a1e4c33f65b5f3609854b45dd86f25405155ccbc343274ad3afd5ff56f\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f36383635373238326566313866343934326338616239313737303537643837363f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Ftonytruong.net\u002F\">Tony\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2014-10-24 00:36:27\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Thanks for that. Very helpful in seeing the bigger picture.\u003C\u002Fp>","2020-05-12T11:02:36Z","OWNER",{"login":310,"avatar_url":311,"html_url":312},"RehanSaeed","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F2270364?v=4","https:\u002F\u002Fgithub.com\u002FRehanSaeed",{"url":314,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271291\u002Freactions",{"id":316,"html_url":317,"body_html":318,"created_at":319,"updated_at":319,"author_association":308,"user":320,"reactions":321},627271344,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271344","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Ff85383816c3018f0f39ff929d628b75a9b747a5ecbdd7d9006ae27f834d30100\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63363061386237636432623439336235613237323437363063343333373037363f733d393626643d6d6d26723d67\">\u003Cimg alt=\"jacob\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Ff85383816c3018f0f39ff929d628b75a9b747a5ecbdd7d9006ae27f834d30100\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63363061386237636432623439336235613237323437363063343333373037363f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>jacob\u003C\u002Fstrong> commented on \u003Cstrong>2014-12-23 17:06:30\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Great blog! thanks for the help, makes alot more sense now\u003C\u002Fp>","2020-05-12T11:02:43Z",{"login":310,"avatar_url":311,"html_url":312},{"url":322,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271344\u002Freactions",{"id":324,"html_url":325,"body_html":326,"created_at":327,"updated_at":327,"author_association":308,"user":328,"reactions":329},627271387,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271387","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fd5652105f984dbb5eab267c12479471ad838e94ccd696ea7709ea8a939bf7bd1\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f36326232356463666666333934653765666633303035383335386237353034373f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Abhinav Singh\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fd5652105f984dbb5eab267c12479471ad838e94ccd696ea7709ea8a939bf7bd1\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f36326232356463666666333934653765666633303035383335386237353034373f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Abhinav Singh\u003C\u002Fstrong> commented on \u003Cstrong>2015-03-06 17:58:38\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>void\u003C\u002Fspan> \u003Cspan>SpotPlane\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>JetFighter\u003C\u002Fspan> \u003Cspan>jetFighter\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>try\u003C\u002Fspan>\n    \u003Cspan>{\u003C\u002Fspan>\n        \u003Cspan>if\u003C\u002Fspan> \u003Cspan>(\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Equals\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>jetFighter\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Name\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>\"UFO\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>{\u003C\u002Fspan>\n            \u003Cspan>throw\u003C\u002Fspan> \u003Cspan>new\u003C\u002Fspan> \u003Cspan>Exception\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"UFO Found\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>}\u003C\u002Fspan>\n        this\u003Cspan>.\u003C\u002Fspan>\u003Cspan>planeSpotted\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>OnNext\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>foo\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>}\u003C\u002Fspan>\n    \u003Cspan>catch\u003C\u002Fspan> \u003Cspan>(\u003C\u002Fspan>\u003Cspan>Exception\u003C\u002Fspan> \u003Cspan>exception\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>{\u003C\u002Fspan>\n        \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>planeSpotted\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>OnError\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>exception\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>}\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>In above code, we should have \u003Ccode>this.planeSpotted.OnNext(jetFighter);\u003C\u002Fcode> instead of \u003Ccode>this.planeSpotted.OnNext(foo);\u003C\u002Fcode>?\u003Cbr \u002F>\nMy understanding is correct?\u003Cbr \u002F>\nPlease reply\u003C\u002Fp>","2020-05-12T11:02:50Z",{"login":310,"avatar_url":311,"html_url":312},{"url":330,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271387\u002Freactions",{"id":332,"html_url":333,"body_html":334,"created_at":335,"updated_at":336,"author_association":308,"user":337,"reactions":338},627271449,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271449","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2015-03-06 19:15:57\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>void\u003C\u002Fspan> \u003Cspan>SpotPlane\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>JetFighter\u003C\u002Fspan> \u003Cspan>jetFighter\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>try\u003C\u002Fspan>\n    \u003Cspan>{\u003C\u002Fspan>\n        \u003Cspan>if\u003C\u002Fspan> \u003Cspan>(\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Equals\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>jetFighter\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Name\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>\"UFO\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>{\u003C\u002Fspan>\n            \u003Cspan>throw\u003C\u002Fspan> \u003Cspan>new\u003C\u002Fspan> \u003Cspan>Exception\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"UFO Found\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>}\u003C\u002Fspan>\n        this\u003Cspan>.\u003C\u002Fspan>\u003Cspan>planeSpotted\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>OnNext\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>foo\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>}\u003C\u002Fspan>\n    \u003Cspan>catch\u003C\u002Fspan> \u003Cspan>(\u003C\u002Fspan>\u003Cspan>Exception\u003C\u002Fspan> \u003Cspan>exception\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>{\u003C\u002Fspan>\n        \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>planeSpotted\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>OnError\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>exception\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>}\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>In above code, we should have \u003Ccode>this.planeSpotted.OnNext(jetFighter);\u003C\u002Fcode> instead of \u003Ccode>this.planeSpotted.OnNext(foo);\u003C\u002Fcode>?\u003Cbr \u002F>\nMy understanding is correct?\u003Cbr \u002F>\nPlease reply\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>Yes that's correct. I've now corrected it.\u003C\u002Fp>","2020-05-12T11:02:57Z","2020-05-12T11:54:33Z",{"login":310,"avatar_url":311,"html_url":312},{"url":339,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271449\u002Freactions",{"id":341,"html_url":342,"body_html":343,"created_at":344,"updated_at":344,"author_association":308,"user":345,"reactions":346},627271492,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271492","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F51f3cb181e7e5588900f79a157b11303ac93e43d0621a567b60ed3425049134d\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f66616564323264626635666464393333633061346131353139623932323338323f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Reader Man\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F51f3cb181e7e5588900f79a157b11303ac93e43d0621a567b60ed3425049134d\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f66616564323264626635666464393333633061346131353139623932323338323f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Freaderman1.wordpress.com\u002F\">Reader Man\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2016-06-04 14:53:49\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Thanks a lot on this series.\u003C\u002Fp>","2020-05-12T11:03:04Z",{"login":310,"avatar_url":311,"html_url":312},{"url":347,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271492\u002Freactions",{"id":349,"html_url":350,"body_html":351,"created_at":352,"updated_at":352,"author_association":308,"user":353,"reactions":354},627271546,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271546","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F687870a135f2a582765906e66dd7846dd7353ff4a211e3622dcf05c948898b30\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f38353433306331623639346232633161653137313066636634613465663232373f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Sam\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F687870a135f2a582765906e66dd7846dd7353ff4a211e3622dcf05c948898b30\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f38353433306331623639346232633161653137313066636634613465663232373f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Sam\u003C\u002Fstrong> commented on \u003Cstrong>2016-08-17 15:45:07\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>When is this called?\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>void\u003C\u002Fspan> \u003Cspan>AllPlanesSpotted\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>planeSpotted\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>OnCompleted\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>","2020-05-12T11:03:12Z",{"login":310,"avatar_url":311,"html_url":312},{"url":355,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271546\u002Freactions",{"id":357,"html_url":358,"body_html":359,"created_at":360,"updated_at":360,"author_association":308,"user":361,"reactions":362},627271591,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271591","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2016-08-19 09:18:50\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>When is this called?\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>void\u003C\u002Fspan> \u003Cspan>AllPlanesSpotted\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>planeSpotted\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>OnCompleted\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003C\u002Fblockquote>\n\u003Cp>I'm just trying to illustrate that observables can have an end, so that no more events are allowed to be raised. It could be called from anywhere.\u003C\u002Fp>","2020-05-12T11:03:19Z",{"login":310,"avatar_url":311,"html_url":312},{"url":363,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271591\u002Freactions",{"id":365,"html_url":366,"body_html":367,"created_at":368,"updated_at":368,"author_association":308,"user":369,"reactions":370},627271635,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271635","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fcb55fe2d2a62c0daaeab2c15fdc991c02e64610093723ce906e16b0ec66f26c6\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f39346137363139393038343537613563383661663362636261626136366632333f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Andrey\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fcb55fe2d2a62c0daaeab2c15fdc991c02e64610093723ce906e16b0ec66f26c6\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f39346137363139393038343537613563383661663362636261626136366632333f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Andrey\u003C\u002Fstrong> commented on \u003Cstrong>2017-01-06 12:48:07\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>\"Intro to Rx\" says that using subjects is discouraged, because they are only for playing, they \"introduce mutability\", may have bad performance in future releases, etc.\u003C\u002Fp>\n\u003Cp>The question is: how do I then implement a Rx equivalent of C# events? Implementing a c# event then using \u003Ccode>FromEventPattern\u003C\u002Fcode> seems cumbersome, subjects are \"discouraged\" what do I use then?\u003C\u002Fp>","2020-05-12T11:03:25Z",{"login":310,"avatar_url":311,"html_url":312},{"url":371,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271635\u002Freactions",{"id":373,"html_url":374,"body_html":375,"created_at":376,"updated_at":376,"author_association":308,"user":377,"reactions":378},627271678,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271678","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2017-01-07 11:10:34\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>\"Intro to Rx\" says that using subjects is discouraged, because they are only for playing, they \"introduce mutability\", may have bad performance in future releases, etc.\u003C\u002Fp>\n\u003Cp>The question is: how do I then implement a Rx equivalent of C# events? Implementing a c# event then using FromEventPattern seems cumbersome, subjects are \"discouraged\" what do I use then?\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>I've read that too, one of the problems is that you can both publish and subscribe to it which can be dangerous. You hit the nail on the head, how else would you implement events without it? I take the more pragmatic approach. I know the potential pitfalls of using it, I know not to expose the subject outside of the class using it, so I use it.\u003C\u002Fp>","2020-05-12T11:03:32Z",{"login":310,"avatar_url":311,"html_url":312},{"url":379,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271678\u002Freactions",{"id":381,"html_url":382,"body_html":383,"created_at":384,"updated_at":384,"author_association":308,"user":385,"reactions":386},627271730,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271730","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fcb55fe2d2a62c0daaeab2c15fdc991c02e64610093723ce906e16b0ec66f26c6\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f39346137363139393038343537613563383661663362636261626136366632333f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Andrey\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fcb55fe2d2a62c0daaeab2c15fdc991c02e64610093723ce906e16b0ec66f26c6\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f39346137363139393038343537613563383661663362636261626136366632333f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Andrey\u003C\u002Fstrong> commented on \u003Cstrong>2017-01-08 13:25:01\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>I've read that too, one of the problems is that you can both publish and subscribe to it which can be dangerous. You hit the nail on the head, how else would you implement events without it? I take the more pragmatic approach. I know the potential pitfalls of using it, I know not to expose the subject outside of the class using it, so I use it.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>I see, these rumours about subjects are mostly about functional programming ideas. For those who just want a substitute for dumb C# events, \u003Ccode>Subject\u003C\u002Fcode> is just right.\u003C\u002Fp>\n\u003Cp>Found a good explanation on when to use \u003Ccode>Subject\u003C\u002Fcode>:\u003Cbr \u002F>\n\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Fdavesexton.com\u002Fblog\u002Fpost\u002FTo-Use-Subject-Or-Not-To-Use-Subject.aspx\">http:\u002F\u002Fdavesexton.com\u002Fblog\u002Fpost\u002FTo-Use-Subject-Or-Not-To-Use-Subject.aspx\u003C\u002Fa>\u003C\u002Fp>","2020-05-12T11:03:39Z",{"login":310,"avatar_url":311,"html_url":312},{"url":387,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271730\u002Freactions",{"id":389,"html_url":390,"body_html":391,"created_at":392,"updated_at":392,"author_association":308,"user":393,"reactions":394},627271784,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271784","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fad823f62b334449081f4ba2981c781d98dadc4a0bf1425dcdb4b917b97b8d8e5\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37386435623636303966653561383063653637653966393731383333613663333f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Jesse Liberty\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fad823f62b334449081f4ba2981c781d98dadc4a0bf1425dcdb4b917b97b8d8e5\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37386435623636303966653561383063653637653966393731383333613663333f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Fjesseliberty.com\u002F\">Jesse Liberty\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2017-01-16 14:08:33\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>You may want to take a quick look at \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Fjliberty.me\u002F2j0ePAP\">http:\u002F\u002Fjliberty.me\u002F2j0ePAP\u003C\u002Fa> -- thanks\u003C\u002Fp>","2020-05-12T11:03:46Z",{"login":310,"avatar_url":311,"html_url":312},{"url":395,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271784\u002Freactions",{"id":397,"html_url":398,"body_html":399,"created_at":400,"updated_at":400,"author_association":308,"user":401,"reactions":402},627271841,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271841","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fa41382bc67b28469c78d7cf834df1e37bdcc6aa6ed8ef160be936275c7280dea\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f62623831346433346432346562326436323562666539623565666239313265643f733d393626643d6d6d26723d67\">\u003Cimg alt=\"HMIndia\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fa41382bc67b28469c78d7cf834df1e37bdcc6aa6ed8ef160be936275c7280dea\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f62623831346433346432346562326436323562666539623565666239313265643f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fhemantmahajan08.wordpress.com\u002F\">HMIndia\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2018-10-18 09:01:35\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>In High refresh applications (say Stock market) can we claim that use of RX will improve the performance and memory management\u003C\u002Fp>","2020-05-12T11:03:53Z",{"login":310,"avatar_url":311,"html_url":312},{"url":403,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271841\u002Freactions",{"id":405,"html_url":406,"body_html":407,"created_at":408,"updated_at":408,"author_association":308,"user":409,"reactions":410},627271897,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271897","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2018-10-23 09:48:04\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>In High refresh applications (say Stock market) can we claim that use of RX will improve the performance and memory management\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>I don't think you can claim that without building it and measuring the difference.\u003C\u002Fp>","2020-05-12T11:03:59Z",{"login":310,"avatar_url":311,"html_url":312},{"url":411,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271897\u002Freactions",{"id":413,"html_url":414,"body_html":415,"created_at":416,"updated_at":416,"author_association":308,"user":417,"reactions":418},627271940,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271940","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F3430e14ebbdaf0c7e8e14f7681265470028662537f0b6b4f9e8c09a99efeb1eb\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f65393330653831383165336331633662353666383439323432643166373161343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"DanClark\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F3430e14ebbdaf0c7e8e14f7681265470028662537f0b6b4f9e8c09a99efeb1eb\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f65393330653831383165336331633662353666383439323432643166373161343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>DanClark\u003C\u002Fstrong> commented on \u003Cstrong>2019-10-08 21:31:58\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Hi,\u003C\u002Fp>\n\u003Cp>I followed your example, are you able to answer this question by any chance?\u003Cbr \u002F>\n\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F58263480\u002Freactive-extension-simple-example-not-working-with-number-generator\">https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F58263480\u002Freactive-extension-simple-example-not-working-with-number-generator\u003C\u002Fa>\u003C\u002Fp>\n\u003Cp>Thanks,\u003C\u002Fp>","2020-05-12T11:04:06Z",{"login":310,"avatar_url":311,"html_url":312},{"url":419,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271940\u002Freactions",{"id":421,"html_url":422,"body_html":423,"created_at":424,"updated_at":424,"author_association":308,"user":425,"reactions":426},627271980,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F103#issuecomment-627271980","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2019-10-10 20:17:12\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Hi,\u003C\u002Fp>\n\u003Cp>I followed your example, are you able to answer this question by any chance?\u003Cbr \u002F>\n\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F58263480\u002Freactive-extension-simple-example-not-working-with-number-generator\">https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F58263480\u002Freactive-extension-simple-example-not-working-with-number-generator\u003C\u002Fa>\u003C\u002Fp>\n\u003Cp>Thanks,\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>That's great! StackOverflow is a great place to ask questions. Have an upvote.\u003C\u002Fp>\n\u003Cp>I had a quick look. You say it doesn't work but don't describe what the problem is, what do you expect and what actually happens.\u003C\u002Fp>","2020-05-12T11:04:13Z",{"login":310,"avatar_url":311,"html_url":312},{"url":427,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627271980\u002Freactions","2014-02-11T00:00:00+00:00",null,"You should definitely consider using Reactive Extensions (Rx) is as a direct replacement for C# events. This post will explain how.","md",[433,435,436],{"depth":434,"value":138},1,{"depth":434,"value":220},{"depth":434,"value":283},"\u002Fimages\u002Fhero\u002FReactive-Extensions-1366x768.png",{},true,"posts\u002F2014\u002Freactive-extensions-part1-replacing-events\u002Findex",[442,443,444,445,446],".NET","C#","Events","Reactive Extensions","Rx",4,{"left":4,"top":4,"width":26,"height":18,"rotate":4,"vFlip":6,"hFlip":6,"body":449},"\u003Cpath fill=\"currentColor\" d=\"M352 320c-22.608 0-43.387 7.819-59.79 20.895l-102.486-64.054a96.55 96.55 0 0 0 0-41.683l102.486-64.054C308.613 184.181 329.392 192 352 192c53.019 0 96-42.981 96-96S405.019 0 352 0s-96 42.981-96 96c0 7.158.79 14.13 2.276 20.841L155.79 180.895C139.387 167.819 118.608 160 96 160c-53.019 0-96 42.981-96 96s42.981 96 96 96c22.608 0 43.387-7.819 59.79-20.895l102.486 64.054A96.3 96.3 0 0 0 256 416c0 53.019 42.981 96 96 96s96-42.981 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