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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":38,"title":39,"author":40,"body":41,"comments":280,"date":314,"dateModified":315,"description":316,"extension":317,"headings":318,"heroImage":323,"meta":324,"path":71,"permalink":71,"published":325,"stem":326,"tags":327,"timeToRead":332},"posts\u002Fposts\u002F2014\u002Freactive-extensions-part4-replacing-timers\u002Findex.md","Reactive Extensions (Rx) - Part 4 - Replacing Timers","Muhammad Rehan Saeed",{"type":42,"value":43,"toc":277},"minimark",[44,97,101,126,157,179,185,199,210,213,222,225,231,234,250,253,267,273],[45,46,47,55,61,67,73,79,85,91],"ol",{},[48,49,50],"li",{},[51,52,54],"a",{"href":53},"\u002Freactive-extensions-part1-replacing-events\u002F","Reactive Extensions (Rx) - Replacing C# Events",[48,56,57],{},[51,58,60],{"href":59},"\u002Freactive-extensions-part2-wrapping-events\u002F","Reactive Extensions (Rx) - Wrapping C# Events",[48,62,63],{},[51,64,66],{"href":65},"\u002Freactive-extensions-part3-naming-conventions\u002F","Reactive Extensions (Rx) - Naming Conventions",[48,68,69],{},[51,70,72],{"href":71},"\u002Freactive-extensions-part4-replacing-timers\u002F","Reactive Extensions (Rx) - Replacing Timers",[48,74,75],{},[51,76,78],{"href":77},"\u002Freactive-extensions-part5-awaiting-observables\u002F","Reactive Extensions (Rx) - Awaiting Observables",[48,80,81],{},[51,82,84],{"href":83},"\u002Freactive-extensions-part6-task-toobservable\u002F","Reactive Extensions (Rx) - Task ToObservable",[48,86,87],{},[51,88,90],{"href":89},"\u002Freactive-extensions-part7-sample-events\u002F","Reactive Extensions (Rx) - Sample Events",[48,92,93],{},[51,94,96],{"href":95},"\u002Freactive-extensions-rx-part-8-timeouts\u002F","Reactive Extensions (Rx) - Timeouts",[98,99,100],"p",{},"Reactive Extensions (Rx) is a huge library. In this series of blog posts I've tried to illustrate real world applications where using Rx can significantly improve and\u002For simplify your code. So far I've talked about using Rx to replace standard C# events and also wrapping C# events with observables.",[98,102,103,104,113,114,119,120,125],{},"In this post I'm going to talk about another area where Rx provides a nicer API surface, as compared to an existing .NET API. In particular, I'm talking about the .NET Timers. There are a few different timers available in the .NET framework. The main ones being ",[51,105,112],{"href":106,"rel":107,"target":111},"http:\u002F\u002Fmsdn.microsoft.com\u002Fen-us\u002Flibrary\u002Fsystem.threading.timer%28v=vs.110%29.aspx",[108,109,110],"nofollow","noopener","noreferrer","_blank","System.Threading.Timer"," and ",[51,115,118],{"href":116,"rel":117,"target":111},"http:\u002F\u002Fmsdn.microsoft.com\u002Fen-us\u002Flibrary\u002Fsystem.timers.timer%28v=vs.110%29.aspx",[108,109,110],"System.Timers.Timer",". Each one has their pros and cons but I'm not going to go into which ones are better as that's a whole ",[51,121,124],{"href":122,"rel":123,"target":111},"http:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F1416803\u002Fsystem-timers-timer-vs-system-threading-timer",[108,109,110],"other conversation",".",[127,128,131,137],"h1",{"id":129,"data-section-heading":130},"existing-net-timers","",[132,133,136],"span",{"className":134},[135],"heading__text","Existing .NET Timers",[138,139,142],"anchor-link",{"href":140,"label":141},"#existing-net-timers","Link to this section",[143,144,151],"svg",{"xmlns":145,"xmlns:xlink":146,"viewBox":147,"version":148,"width":149,"height":149,"aria-hidden":150},"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","http:\u002F\u002Fwww.w3.org\u002F1999\u002Fxlink","0 0 16 16","1.1",22,"true",[152,153],"path",{"fill":154,"fill-rule":155,"d":156},"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",[98,158,159,160,163,164,166,167,170,171,174,175,178],{},"Below is a very simple example of how to use the ",[161,162,118],"code",{}," (",[161,165,112],{}," is very similar). We new-up a ",[161,168,169],{},"Timer"," with the number of milliseconds we want to timer to raise it's ",[161,172,173],{},"Elapsed"," event, register for the ",[161,176,177],{},"Elasped"," event and finally start the timer.",[180,181],"pre",{"className":182,"language":183,"meta":130,"style":130,"html":184},"language-cs shiki shiki-themes light-plus monokai","cs","\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> StartTimer\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\">    Timer\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> timer\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> new\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Timer\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">5000\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    timer\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Elapsed\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> +=\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">OnTimerElapsed\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    timer\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Start\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=\"sJvqV\">private\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> OnTimerElapsed\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\">ElapsedEventArgs\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> e\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=\"s1q82\">    \u002F\u002F Do Stuff Here\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    Console\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WriteLine\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">e\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">SignalTime\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">    \u002F\u002F Console WriteLine Prints\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">    \u002F\u002F 11\u002F03\u002F2014 10:58:35\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">    \u002F\u002F 11\u002F03\u002F2014 10:58:40\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">    \u002F\u002F 11\u002F03\u002F2014 10:58:45\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">    \u002F\u002F ...\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[127,186,188,192],{"id":187,"data-section-heading":130},"reactive-extensions-rx-timers",[132,189,191],{"className":190},[135],"Reactive Extensions (Rx) Timers",[138,193,195],{"href":194,"label":141},"#reactive-extensions-rx-timers",[143,196,197],{"xmlns":145,"xmlns:xlink":146,"viewBox":147,"version":148,"width":149,"height":149,"aria-hidden":150},[152,198],{"fill":154,"fill-rule":155,"d":156},[98,200,201,202,205,206,209],{},"Now here is how to do almost the exact same thing with Reactive Extensions. In this scenario we use the ",[161,203,204],{},"Interval"," method to specify the timer interval and simply subscribe to the observable. The only difference is that we don't get a ",[161,207,208],{},"DateTime"," with the time of the timer elapsed event but an integer representing the number of times the timer elapsed delegate has been fired (Much more useful in my opinion, as you can always derive the time from this number).",[180,211],{"className":182,"language":183,"meta":130,"style":130,"html":212},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> StartTimer\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=\"sFrd5\">    Observable\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Interval\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromSeconds\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">5\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Subscribe\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">            x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Do Stuff Here\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">                Console\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WriteLine\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                    \u002F\u002F Console WriteLine Prints\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                    \u002F\u002F 0\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                    \u002F\u002F 1\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                    \u002F\u002F 2\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                    \u002F\u002F ...\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>",[98,214,215,216,218,219,221],{},"But that's not all, Reactive Extensions provides another method which can be quite useful. In the example below which looks almost exactly the same, we use the ",[161,217,169],{}," method instead of ",[161,220,204],{},". This method only calls the timer elapsed delegate once.",[180,223],{"className":182,"language":183,"meta":130,"style":130,"html":224},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> StartTimerAndFireOnce\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=\"sFrd5\">    Observable\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Timer\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromSeconds\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">5\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Subscribe\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">            x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Do Stuff Here\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">                Console\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WriteLine\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Console WriteLine Prints\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F 0\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>",[98,226,227,228,230],{},"The ",[161,229,169],{}," method has lots of overloads which you can take a look at. The example below calls the timer elapsed delegate every five seconds but only starts to do so, after a minute has passed.",[180,232],{"className":182,"language":183,"meta":130,"style":130,"html":233},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> StartTimerInOneMinute\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=\"sFrd5\">    Observable\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Timer\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromMinutes\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">), \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromSeconds\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">5\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Subscribe\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">            x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Do Stuff Here\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">                Console\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WriteLine\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Console WriteLine Prints\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F 0\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F 1\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F 2\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F ...\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>",[98,235,236,237,113,239,241,242,245,246,249],{},"The final thing you need to know about the ",[161,238,204],{},[161,240,169],{}," methods is that they can optionally take an ",[161,243,244],{},"IScheduler"," as a final parameter. This allows the timer elapsed delegate to be run on any thread of your choosing. In the example below we are subscribing the event on the WPF UI thread. There are several other ",[161,247,248],{},"Scheduler","'s you can use, so just take a look.",[180,251],{"className":182,"language":183,"meta":130,"style":130,"html":252},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> StartTimerOnUIThread\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=\"sFrd5\">    Observable\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Interval\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromSeconds\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">5\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">), \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">DispatcherScheduler\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Current\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Subscribe\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">            x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Do UI Stuff Here\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>",[127,254,256,260],{"id":255,"data-section-heading":130},"conclusions",[132,257,259],{"className":258},[135],"Conclusions",[138,261,263],{"href":262,"label":141},"#conclusions",[143,264,265],{"xmlns":145,"xmlns:xlink":146,"viewBox":147,"version":148,"width":149,"height":149,"aria-hidden":150},[152,266],{"fill":154,"fill-rule":155,"d":156},[98,268,269,270,125],{},"If you haven't started using Reactive Extensions yet, then here is yet another reason to get going. What I have not shown in this post is the shear superhuman power you get when you use the Linq methods to modify your observable just before you make the call to ",[161,271,272],{},"Subscribe",[274,275,276],"style",{},"html pre.shiki code .sJvqV, html code.shiki .sJvqV{--shiki-default:#0000FF;--shiki-dark:#F92672}html pre.shiki code .sWm5y, html code.shiki .sWm5y{--shiki-default:#795E26;--shiki-dark:#A6E22E}html pre.shiki code .sjLUg, html code.shiki .sjLUg{--shiki-default:#000000;--shiki-dark:#F8F8F2}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 .sFrd5, html code.shiki .sFrd5{--shiki-default:#001080;--shiki-dark:#F8F8F2}html pre.shiki code .snCLD, html code.shiki .snCLD{--shiki-default:#000000;--shiki-dark:#F92672}html pre.shiki code .s0PsH, html code.shiki .s0PsH{--shiki-default:#098658;--shiki-dark:#AE81FF}html pre.shiki code .sK46n, html code.shiki .sK46n{--shiki-default:#0000FF;--shiki-dark:#FD971F}html pre.shiki code .s1q82, html code.shiki .s1q82{--shiki-default:#008000;--shiki-dark:#88846F}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);}",{"title":130,"searchDepth":278,"depth":278,"links":279},2,[],{"issue":281,"comments":285},{"number":282,"title":283,"html_url":284},106,"[Comment] Reactive Extensions (Rx) - Part 4 - Replacing Timers","https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F106",[286,298,306],{"id":287,"html_url":288,"body_html":289,"created_at":290,"updated_at":290,"author_association":291,"user":292,"reactions":296},627272606,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F106#issuecomment-627272606","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F39875530cf64e8c9ca7d0451058a5641b756fa38bb6119951f7831992b24ff8c\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63316633336461653736356634393263316632653364353364316633303537373f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Michael Khalsa\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F39875530cf64e8c9ca7d0451058a5641b756fa38bb6119951f7831992b24ff8c\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63316633336461653736356634393263316632653364353364316633303537373f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Michael Khalsa\u003C\u002Fstrong> commented on \u003Cstrong>2018-04-19 01:33:58\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Nice series, thanks!\u003C\u002Fp>\n\u003Cp>Question about the timer example:\u003Cbr \u002F>\nIs it best practice to add on .Dispose to the subscriber to have it cleanup (assuming yes), or will this happen automatically when the method completes. (showed example in vb)\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>Observable\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Timer\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>TimeSpan\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>FromMilliseconds\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>intervalMs\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>ObserveOn\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>Threading\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>SynchronizationContext\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Current\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Subscribe\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>Function\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>x\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan> StatusBar\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Panels\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"statusPanelHeartbeat\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Visible\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>False\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan>\n               \u003Cspan>Function\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>x\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan> StatusBar\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Panels\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"statusPanelHeartbeat\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Visible\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>False\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Dispose\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>","2020-05-12T11:05:37Z","OWNER",{"login":293,"avatar_url":294,"html_url":295},"RehanSaeed","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F2270364?v=4","https:\u002F\u002Fgithub.com\u002FRehanSaeed",{"url":297,"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\u002F627272606\u002Freactions",{"id":299,"html_url":300,"body_html":301,"created_at":302,"updated_at":302,"author_association":291,"user":303,"reactions":304},627272664,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F106#issuecomment-627272664","\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>2018-04-19 09:16:59\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Nice series, thanks!\u003C\u002Fp>\n\u003Cp>Question about the timer example:\u003Cbr \u002F>\nIs it best practice to add on .Dispose to the subscriber to have it cleanup (assuming yes), or will this happen automatically when the method completes. (showed example in vb)\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>Observable\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Timer\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>TimeSpan\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>FromMilliseconds\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>intervalMs\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>ObserveOn\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>Threading\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>SynchronizationContext\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Current\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Subscribe\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>Function\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>x\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan> StatusBar\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Panels\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"statusPanelHeartbeat\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Visible\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>False\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan>\n               \u003Cspan>Function\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>x\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan> StatusBar\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Panels\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"statusPanelHeartbeat\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Visible\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>False\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n    \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Dispose\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003C\u002Fblockquote>\n\u003Cp>Here is a really good explanation:\u003C\u002Fp>\n\u003Cp>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F7703366\u002Freactive-observable-subscription-disposal\">https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F7703366\u002Freactive-observable-subscription-disposal\u003C\u002Fa>\u003C\u002Fp>","2020-05-12T11:05:44Z",{"login":293,"avatar_url":294,"html_url":295},{"url":305,"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\u002F627272664\u002Freactions",{"id":307,"html_url":308,"body_html":309,"created_at":310,"updated_at":310,"author_association":291,"user":311,"reactions":312},627272708,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F106#issuecomment-627272708","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F39875530cf64e8c9ca7d0451058a5641b756fa38bb6119951f7831992b24ff8c\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63316633336461653736356634393263316632653364353364316633303537373f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Michael Khalsa\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F39875530cf64e8c9ca7d0451058a5641b756fa38bb6119951f7831992b24ff8c\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63316633336461653736356634393263316632653364353364316633303537373f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Michael Khalsa\u003C\u002Fstrong> commented on \u003Cstrong>2018-04-22 00:29:47\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Here is a really good explanation:\u003C\u002Fp>\n\u003Cp>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F7703366\u002Freactive-observable-subscription-disposal\">https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F7703366\u002Freactive-observable-subscription-disposal\u003C\u002Fa>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>Thank you.\u003C\u002Fp>\n\u003Cp>It was necessary to remove the \u003Ccode>.Dispose\u003C\u002Fcode> in this case to make it work correctly.\u003C\u002Fp>","2020-05-12T11:05:51Z",{"login":293,"avatar_url":294,"html_url":295},{"url":313,"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\u002F627272708\u002Freactions","2014-03-11T00:00:00+00:00",null,"You should definitely consider using Reactive Extensions (Rx) is as a direct replacement for .NET Timers. This post will explain how.","md",[319,321,322],{"depth":320,"value":136},1,{"depth":320,"value":191},{"depth":320,"value":259},"\u002Fimages\u002Fhero\u002FReactive-Extensions-1366x768.png",{},true,"posts\u002F2014\u002Freactive-extensions-part4-replacing-timers\u002Findex",[328,329,330,331,169],".NET","C#","Reactive Extensions","Rx",3,[334,338,342,346,349,351,353,357,361,365,366,370,375,377,380,383,387,391,394,398,402,406,409,414,419,423,426,429,431,436,440,443,448,452,456,460,463,467,471,475,479,483,487,491,494,498,502,506,510,513,517,521,523,526,530,534,539,543,547,551,555,559,563,566,569,572,576,580,583,587,590,593,596,599,603,607,610,613,617,621,624,627,630,634,638,642,646,649,652,657,660,663,667,670,674,678,681,685,688,691,695,699,703,707],{"title":335,"permalink":336,"heroImage":337,"timeToRead":320},"Just Start - The First Blog Post","\u002Fjust-start-the-first-blog-post\u002F","\u002Fimages\u002Fhero\u002FJust-Start-1366x768.png",{"title":339,"permalink":340,"heroImage":341,"timeToRead":278},"ConfigureAwait in Task Parallel Library (TPL)","\u002Fconfigureawait-task-parallel-library\u002F","\u002Fimages\u002Fhero\u002FMicrosoft-.NET-1366x768.png",{"title":343,"permalink":344,"heroImage":345,"timeToRead":332},"Stop The Brace Wars, Use StyleCop","\u002Fstop-brace-wars-use-stylecop\u002F","\u002Fimages\u002Fhero\u002FStyleCop-1366x768.png",{"title":347,"permalink":53,"heroImage":323,"timeToRead":348},"Reactive Extensions (Rx) - Part 1 - Replacing C# Events",4,{"title":350,"permalink":59,"heroImage":323,"timeToRead":332},"Reactive Extensions (Rx) - Part 2 - Wrapping C# Events",{"title":352,"permalink":65,"heroImage":323,"timeToRead":278},"Reactive Extensions (Rx) - Part 3 - Naming Conventions",{"title":354,"permalink":355,"heroImage":356,"timeToRead":332},"WPF Metro Part 1 - Modern UI for 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