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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",[98,99,102,108],"h1",{"id":100,"data-section-heading":101},"a-quick-recap","",[103,104,107],"span",{"className":105},[106],"heading__text","A Quick Recap",[109,110,113],"anchor-link",{"href":111,"label":112},"#a-quick-recap","Link to this section",[114,115,122],"svg",{"xmlns":116,"xmlns:xlink":117,"viewBox":118,"version":119,"width":120,"height":120,"aria-hidden":121},"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","http:\u002F\u002Fwww.w3.org\u002F1999\u002Fxlink","0 0 16 16","1.1",22,"true",[123,124],"path",{"fill":125,"fill-rule":126,"d":127},"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",[129,130,131,132,136,137,140],"p",{},"In my previous posts on Reactive Extensions (Rx) I've outlined a few clear areas where Reactive Extensions can be used in the real world. I've uncovered areas where it provides a cleaner and improved API surface as compared to older .NET code. Namely, replacing C# events, wrapping existing C# events and replacing ",[133,134,135],"code",{},"System.Threading.Timers"," (Or other ",[133,138,139],{},"Timer"," classes, of which there are a few in .NET).",[129,142,143],{},"Once you have your observables, you need to do something with them. In my last post on the subject I showed how and when you can await an observable.",[129,145,146],{},"In this post I'm going to show how you can also go the other way around. You can turn tasks into an observable. I'll also show one clear reason to use this facility.",[98,148,150,154],{"id":149,"data-section-heading":101},"converting-tasks-to-observables",[103,151,153],{"className":152},[106],"Converting Tasks to Observables",[109,155,157],{"href":156,"label":112},"#converting-tasks-to-observables",[114,158,159],{"xmlns":116,"xmlns:xlink":117,"viewBox":118,"version":119,"width":120,"height":120,"aria-hidden":121},[123,160],{"fill":125,"fill-rule":126,"d":127},[129,162,163,164,167,168,171,172,175,176,178,179,182,183,186,187,190,191,194,195,198],{},"The ",[133,165,166],{},"ToObservable"," extension method allows you to convert a Task or ",[133,169,170],{},"Task\u003CT>"," into an ",[133,173,174],{},"IObservable\u003CT>",". Calling ",[133,177,166],{}," on a ",[133,180,181],{},"Task"," returns an ",[133,184,185],{},"IObservable\u003CUnit>",". A ",[133,188,189],{},"Unit"," is a kind of empty object that does nothing, the only reason it is there is because there is no ",[133,192,193],{},"IObservable"," (Without the ",[133,196,197],{},"T",") interface.",[200,201],"pre",{"className":202,"language":203,"meta":101,"style":101,"html":204},"language-cs shiki shiki-themes light-plus monokai","cs","\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Unit\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Run\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Console\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WriteLine\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"Working\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)).\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observableT\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Run\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"swiDo\"> \"Working\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">).\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>",[129,206,207],{},"If you subscribe to the above observables, they will only ever return one value and then complete. You might be thinking, hang on just a second Rehan, whats the point of doing this?",[98,209,211,215],{"id":210,"data-section-heading":101},"putting-it-all-together",[103,212,214],{"className":213},[106],"Putting It All Together",[109,216,218],{"href":217,"label":112},"#putting-it-all-together",[114,219,220],{"xmlns":116,"xmlns:xlink":117,"viewBox":118,"version":119,"width":120,"height":120,"aria-hidden":121},[123,221],{"fill":125,"fill-rule":126,"d":127},[129,223,224],{},"So when should we use this feature? Well, lets walk through some examples and see what happens. Lets assume we have the following contrived code:",[200,226],{"className":202,"language":203,"meta":101,"style":101,"html":227},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\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\">    return\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Run\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">        async\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> () \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=\"sJvqV\">            await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Delay\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">500\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">            return\u003C\u002Fspan>\u003Cspan class=\"swiDo\"> \"Hello\"\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>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\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\">    return\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Run\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">        async\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> () \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=\"sJvqV\">            await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Delay\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">1000\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">            return\u003C\u002Fspan>\u003Cspan class=\"swiDo\"> \"World\"\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>",[129,229,230],{},"What happens in the case where we call both of these methods and want to get the first result back. How does this code look using the Task Parallel Library (TPL) as compared to Reactive Extensions (Rx).",[200,232],{"className":202,"language":203,"meta":101,"style":101,"html":233},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForFirstResultAndReturn\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\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WhenAny\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\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\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForFirstResultAndReturn\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\">    IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> observable1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Merge\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">).\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FirstAsync\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[129,235,236,237,240],{},"In the Task Parallel Library (TPL) example, I simply use the ",[133,238,239],{},"WhenAny"," method to await the first task that completes and then return the result.",[129,242,243,244,247,248,251],{},"In the Reactive Extensions example above, I'm converting my tasks to observables, using the Merge method to convert them to a single observable and then using the ",[133,245,246],{},"FirstAsync"," method to await the first result (We covered ",[133,249,250],{},"await","'ing observables in the last post).",[129,253,254],{},"Overall the two techniques look pretty similar, with the TPL having a slight edge in terms of simplicity.",[129,256,257],{},"How about another example. Here we will try to await both of the results and put them together to get some meaningful result.",[200,259],{"className":202,"language":203,"meta":101,"style":101,"html":260},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForAllResultsAndReturnCombinedResult\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\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Join\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\" \"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sJvqV\">await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WhenAll\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\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\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForAllResultsAndReturnCombinedResult\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\">    IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> observable1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Zip\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, (\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Join\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\" \"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">));\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[129,262,263,264,267],{},"In the Task Parallel Library (TPL) example, I'm using the ",[133,265,266],{},"WhenAll"," method to await the results of both tasks which are returned as an array of strings. I then join these strings and return the results.",[129,269,270,271,274],{},"In the Reactive Extensions example above, I'm converting my tasks to observables, then using the ",[133,272,273],{},"Zip"," method to combine the results returned from both observables by providing it with a delegate which joins the two strings.",[129,276,277],{},"Again, both look pretty similar but with the pure TPL example being slightly simpler to understand.",[129,279,280],{},"One more example, this time we'll return the first result but add a timeout to the equation.",[200,282],{"className":202,"language":203,"meta":101,"style":101,"html":283},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForFirstResultAndReturnResultWithTimeOut\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\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    Task\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> timeoutTask\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Delay\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">100\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    Task\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> completedTask\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WhenAny\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">timeoutTask\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\">completedTask\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> ==\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> timeoutTask\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\"> TimeoutException\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"The operation has timed out\"\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=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> ((\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>)\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">completedTask\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">).\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Result\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\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForFirstResultAndReturnResultWithTimeOut\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\">    IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    IObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> observable1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Merge\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">observable2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">).\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Timeout\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromMilliseconds\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">100\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)).\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FirstAsync\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[129,285,286,287,290],{},"In the Task Parallel Library (TPL) example, I'm awaiting a third task which represents the timeout. If the timeout task finishes first, I raise a ",[133,288,289],{},"TimeoutException",".",[129,292,293,294,297],{},"In the Reactive Extensions example, we merge the two observables again but this time use the ",[133,295,296],{},"Timeout"," method to achieve the same results.",[129,299,300],{},"Here we have a clear winner, the Reactive Extensions code is more concise and easier to follow.",[129,302,303],{},"What happens when we combine the two approaches.",[200,305],{"className":202,"language":203,"meta":101,"style":101,"html":306},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WaitForFirstResultAndReturnResultWithTimeOut2\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\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetHelloString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetWorldString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">    return\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> Task\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">WhenAny\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task1\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">task2\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ToObservable\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">()\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Timeout\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">TimeSpan\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FromMilliseconds\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"s0PsH\">1000\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">FirstAsync\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[129,308,309,310,312,313,315],{},"Here we use the ",[133,311,166],{}," and ",[133,314,296],{}," methods right at the end. As you can see this combined approach gives us the best of both worlds and makes the code much easier to read.",[98,317,319,323],{"id":318,"data-section-heading":101},"conclusions",[103,320,322],{"className":321},[106],"Conclusions",[109,324,326],{"href":325,"label":112},"#conclusions",[114,327,328],{"xmlns":116,"xmlns:xlink":117,"viewBox":118,"version":119,"width":120,"height":120,"aria-hidden":121},[123,329],{"fill":125,"fill-rule":126,"d":127},[129,331,332,333,335,336,338],{},"One definite reason to convert ",[133,334,181],{},"'s to Observables is to use the ",[133,337,296],{}," method. There may be other reasons but I'm having a hard time thinking of any right now. In fact, I'm having a hard time thinking of any other posts to make about Reactive Extensions (Rx). It's an interesting chunk of code and I've learned a lot writing this series of posts as I hope you have too.",[340,341,342],"style",{},"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 .snCLD, html code.shiki .snCLD{--shiki-default:#000000;--shiki-dark:#F92672}html pre.shiki code .sWm5y, html code.shiki .sWm5y{--shiki-default:#795E26;--shiki-dark:#A6E22E}html pre.shiki code .swiDo, html code.shiki .swiDo{--shiki-default:#A31515;--shiki-dark:#E6DB74}html pre.shiki code .sJvqV, html code.shiki .sJvqV{--shiki-default:#0000FF;--shiki-dark:#F92672}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 .smL5M, html code.shiki .smL5M{--shiki-default:#AF00DB;--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}",{"title":101,"searchDepth":344,"depth":344,"links":345},2,[],{"issue":347,"comments":351},{"number":348,"title":349,"html_url":350},108,"[Comment] Reactive Extensions (Rx) - Part 6 - Task ToObservable","https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108",[352,364,372,380,388,396,404],{"id":353,"html_url":354,"body_html":355,"created_at":356,"updated_at":356,"author_association":357,"user":358,"reactions":362},627272927,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627272927","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F41d0d601b732f2f9ede4254d00897b584f8db416bfe6085d188ad9b5e062fe5b\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f30326137643436626133363764616364363566386435363839346336336139373f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Dennis Daume\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F41d0d601b732f2f9ede4254d00897b584f8db416bfe6085d188ad9b5e062fe5b\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f30326137643436626133363764616364363566386435363839346336336139373f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Ftwitter.com\u002Fflagbug\">Dennis Daume\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2014-04-25 20:19:20\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>I think instead of \u003Ccode>obs1.Merge(obs2).FirstAsync\u003C\u002Fcode> you can write \u003Ccode>obs1.Amb(obs2)\u003C\u002Fcode> to get the first responding sequence :)\u003C\u002Fp>","2020-05-12T11:06:26Z","OWNER",{"login":359,"avatar_url":360,"html_url":361},"RehanSaeed","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F2270364?v=4","https:\u002F\u002Fgithub.com\u002FRehanSaeed",{"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\u002F627272927\u002Freactions",{"id":365,"html_url":366,"body_html":367,"created_at":368,"updated_at":368,"author_association":357,"user":369,"reactions":370},627272970,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627272970","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F10fa236d10e8f2aed39ba67e67a063ff39f14b9b9e95eb1f46749c859634c261\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f31643864386163373739386664363038343138356330376263376333393433333f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Daniel\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F10fa236d10e8f2aed39ba67e67a063ff39f14b9b9e95eb1f46749c859634c261\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f31643864386163373739386664363038343138356330376263376333393433333f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Daniel\u003C\u002Fstrong> commented on \u003Cstrong>2015-12-29 09:37:32\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Thank you for showing clear, practical code!\u003Cbr \u002F>\nI think the TPL vs Rx solutions in the timeout example aren't doing the same thing though:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>TPL: the \u003Ccode>Task.Delay()\u003C\u002Fcode> runs in parallel, making the timeout count from the start.\u003C\u002Fli>\n\u003Cli>Rx: \u003Ccode>.Timeout()\u003C\u002Fcode> counts from last item yielded (\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Freactivex.io\u002Fdocumentation\u002Foperators\u002Ftimeout.html\">http:\u002F\u002Freactivex.io\u002Fdocumentation\u002Foperators\u002Ftimeout.html\u003C\u002Fa>)\u003C\u002Fli>\n\u003C\u002Ful>","2020-05-12T11:06:33Z",{"login":359,"avatar_url":360,"html_url":361},{"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\u002F627272970\u002Freactions",{"id":373,"html_url":374,"body_html":375,"created_at":376,"updated_at":376,"author_association":357,"user":377,"reactions":378},627273024,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627273024","\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>2016-01-07 16:22:26\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Thank you for showing clear, practical code!\u003Cbr \u002F>\nI think the TPL vs Rx solutions in the timeout example aren't doing the same thing though:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>TPL: the \u003Ccode>Task.Delay()\u003C\u002Fcode> runs in parallel, making the timeout count from the start.\u003C\u002Fli>\n\u003Cli>Rx: \u003Ccode>.Timeout()\u003C\u002Fcode> counts from last item yielded (\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Freactivex.io\u002Fdocumentation\u002Foperators\u002Ftimeout.html\">http:\u002F\u002Freactivex.io\u002Fdocumentation\u002Foperators\u002Ftimeout.html\u003C\u002Fa>)\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fblockquote>\n\u003Cp>Yes but there is only one item yielded from each observable. Perhaps I have misunderstood you.\u003C\u002Fp>","2020-05-12T11:06:40Z",{"login":359,"avatar_url":360,"html_url":361},{"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\u002F627273024\u002Freactions",{"id":381,"html_url":382,"body_html":383,"created_at":384,"updated_at":384,"author_association":357,"user":385,"reactions":386},627273078,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627273078","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F10fa236d10e8f2aed39ba67e67a063ff39f14b9b9e95eb1f46749c859634c261\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f31643864386163373739386664363038343138356330376263376333393433333f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Daniel\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F10fa236d10e8f2aed39ba67e67a063ff39f14b9b9e95eb1f46749c859634c261\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f31643864386163373739386664363038343138356330376263376333393433333f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Daniel\u003C\u002Fstrong> commented on \u003Cstrong>2016-01-10 21:37:30\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Yes but there is only one item yielded from each observable. Perhaps I have misunderstood you.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>True, my bad, thanks for the response.\u003C\u002Fp>","2020-05-12T11:06:46Z",{"login":359,"avatar_url":360,"html_url":361},{"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\u002F627273078\u002Freactions",{"id":389,"html_url":390,"body_html":391,"created_at":392,"updated_at":392,"author_association":357,"user":393,"reactions":394},627273136,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627273136","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F2bf912a07912c809bd0cc5ba465602e8d6c37b226a14daae4cf3e9978c015719\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f36623133383966393665346239326366386565383431613065396563383862373f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Guan George\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F2bf912a07912c809bd0cc5ba465602e8d6c37b226a14daae4cf3e9978c015719\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f36623133383966393665346239326366386565383431613065396563383862373f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Guan George\u003C\u002Fstrong> commented on \u003Cstrong>2017-11-17 21:05:34\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Very good and helpful. Thanks for your blog. ^_^\u003C\u002Fp>\n\u003Cp>One suggestion, \u003Ccode>Task.Run(async...)\u003C\u002Fcode> can be removed like this:\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>async\u003C\u002Fspan> \u003Cspan>\u003Cspan>static\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan> \u003Cspan>GetHelloString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>await\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Delay\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>2000\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>return\u003C\u002Fspan> \u003Cspan>\"Hello\"\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>One correction: should we use \u003Ccode>await await\u003C\u002Fcode> instead of \u003Ccode>await\u003C\u002Fcode> cause \u003Ccode>WhenAny\u003C\u002Fcode> returns \u003Ccode>Task<Task>\u003C\u002Fcode>?\u003Cbr \u002F>\nif only one \u003Ccode>await\u003C\u002Fcode>, complier will not succeed (At least in my VS 2015 ^_^).\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>async\u003C\u002Fspan> \u003Cspan>\u003Cspan>static\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan> \u003Cspan>WaitForFirstResultAndReturnResultWithTimeOut2\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>Task\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan> \u003Cspan>task1\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>GetHelloString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>Task\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan> \u003Cspan>task2\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>GetWorldString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>return\u003C\u002Fspan> \u003Cspan>await\u003C\u002Fspan> \u003Cspan>await\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>WhenAny\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>task1\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>task2\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>.\u003C\u002Fspan>\u003Cspan>ToObservable\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Timeout\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>TimeSpan\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>FromMilliseconds\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>500\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>.\u003C\u002Fspan>\u003Cspan>FirstAsync\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>I started learn C# 1 week ago, so my option may be wrong. Sorry if.\u003C\u002Fp>","2020-05-12T11:06:53Z",{"login":359,"avatar_url":360,"html_url":361},{"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\u002F627273136\u002Freactions",{"id":397,"html_url":398,"body_html":399,"created_at":400,"updated_at":400,"author_association":357,"user":401,"reactions":402},627273184,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627273184","\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>2017-11-20 08:35:16\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Very good and helpful. Thanks for your blog. ^_^\u003C\u002Fp>\n\u003Cp>One suggestion, \u003Ccode>Task.Run(async...)\u003C\u002Fcode> can be removed like this:\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>async\u003C\u002Fspan> \u003Cspan>\u003Cspan>static\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan> \u003Cspan>GetHelloString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>await\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Delay\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>2000\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>return\u003C\u002Fspan> \u003Cspan>\"Hello\"\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>One correction: should we use \u003Ccode>await await\u003C\u002Fcode> instead of \u003Ccode>await\u003C\u002Fcode> cause \u003Ccode>WhenAny\u003C\u002Fcode> returns \u003Ccode>Task<Task>\u003C\u002Fcode>?\u003Cbr \u002F>\nif only one \u003Ccode>await\u003C\u002Fcode>, complier will not succeed (At least in my VS 2015 ^_^).\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>public\u003C\u002Fspan> \u003Cspan>async\u003C\u002Fspan> \u003Cspan>\u003Cspan>static\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan> \u003Cspan>WaitForFirstResultAndReturnResultWithTimeOut2\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>Task\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan> \u003Cspan>task1\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>GetHelloString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>Task\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan> \u003Cspan>task2\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>GetWorldString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n    \u003Cspan>return\u003C\u002Fspan> \u003Cspan>await\u003C\u002Fspan> \u003Cspan>await\u003C\u002Fspan> \u003Cspan>Task\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>WhenAny\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>task1\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>task2\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>.\u003C\u002Fspan>\u003Cspan>ToObservable\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>.\u003C\u002Fspan>\u003Cspan>Timeout\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>TimeSpan\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>FromMilliseconds\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>500\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\n        \u003Cspan>.\u003C\u002Fspan>\u003Cspan>FirstAsync\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>I started learn C# 1 week ago, so my option may be wrong. Sorry if.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>\u003Ccode>Task.WhenAny\u003C\u002Fcode> should not be returning a task of task unless you are doing something very strange.\u003C\u002Fp>","2020-05-12T11:07:00Z",{"login":359,"avatar_url":360,"html_url":361},{"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\u002F627273184\u002Freactions",{"id":405,"html_url":406,"body_html":407,"created_at":408,"updated_at":408,"author_association":357,"user":409,"reactions":410},627273235,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F108#issuecomment-627273235","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Ffaaaae7b3e41d3c8d6c8bdc5ac6bf263f265e20babb6dc0ca32d76d5dd18f592\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37643065396537373738396237343737353337373163343465663963666432383f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Frank\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Ffaaaae7b3e41d3c8d6c8bdc5ac6bf263f265e20babb6dc0ca32d76d5dd18f592\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37643065396537373738396237343737353337373163343465663963666432383f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Frank\u003C\u002Fstrong> commented on \u003Cstrong>2018-01-23 15:47:51\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>I am not sure yet, as I have not tested, but I think I see a need for this in Linq code of the kind \u003Ccode>from x in y select f(x)\u003C\u002Fcode>, where \u003Ccode>f\u003C\u002Fcode> is an \u003Ccode>async\u003C\u002Fcode> function and the result is an \u003Ccode>IObservable<f(x)>\u003C\u002Fcode>.\u003C\u002Fp>","2020-05-12T11:07:08Z",{"login":359,"avatar_url":360,"html_url":361},{"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\u002F627273235\u002Freactions","2014-04-25T00:00:00+00:00",null,"How and where to use the Reactive Extensions (Rx) ToObservable Extension method to turn a Task Parallel Library (TPL) Task into an IObservable.","md",[417,419,420,421],{"depth":418,"value":107},1,{"depth":418,"value":153},{"depth":418,"value":214},{"depth":418,"value":322},"\u002Fimages\u002Fhero\u002FReactive-Extensions-1366x768.png",{},true,"posts\u002F2014\u002Freactive-extensions-part6-task-toobservable\u002Findex",[427,428,429,430,431,432],".NET","C#","Reactive Extensions","Rx","Task Parallel Library","TPL",5,[435,439,443,448,451,453,455,459,463,467,469,473,478,480,483,484,488,492,495,499,503,507,510,515,520,524,527,530,532,537,541,544,549,553,557,561,564,568,572,576,580,584,588,592,595,599,603,607,611,614,618,622,624,627,631,635,640,644,648,652,656,660,664,667,670,673,677,681,684,688,691,694,697,700,704,708,711,714,718,722,725,728,731,735,739,743,747,750,753,758,761,764,768,771,775,779,782,786,789,792,796,800,804,808],{"title":436,"permalink":437,"heroImage":438,"timeToRead":418},"Just Start - The First Blog Post","\u002Fjust-start-the-first-blog-post\u002F","\u002Fimages\u002Fhero\u002FJust-Start-1366x768.png",{"title":440,"permalink":441,"heroImage":442,"timeToRead":344},"ConfigureAwait in Task Parallel Library (TPL)","\u002Fconfigureawait-task-parallel-library\u002F","\u002Fimages\u002Fhero\u002FMicrosoft-.NET-1366x768.png",{"title":444,"permalink":445,"heroImage":446,"timeToRead":447},"Stop The Brace Wars, Use StyleCop","\u002Fstop-brace-wars-use-stylecop\u002F","\u002Fimages\u002Fhero\u002FStyleCop-1366x768.png",3,{"title":449,"permalink":53,"heroImage":422,"timeToRead":450},"Reactive Extensions (Rx) - Part 1 - Replacing C# Events",4,{"title":452,"permalink":59,"heroImage":422,"timeToRead":447},"Reactive Extensions (Rx) - Part 2 - Wrapping C# Events",{"title":454,"permalink":65,"heroImage":422,"timeToRead":344},"Reactive Extensions (Rx) - Part 3 - Naming Conventions",{"title":456,"permalink":457,"heroImage":458,"timeToRead":447},"WPF Metro Part 1 - Modern UI for WPF","\u002Fwpf-metro-part1-modern-ui-for-wpf\u002F","\u002Fimages\u002Fhero\u002FModern-UI-for-WPF-1366x768.png",{"title":460,"permalink":461,"heroImage":462,"timeToRead":447},"WPF Metro Part 2 - MahApps Metro","\u002Fwpf-metro-part2-mahapps-metro\u002F","\u002Fimages\u002Fhero\u002FMahApps-Metro-1366x768.png",{"title":464,"permalink":465,"heroImage":466,"timeToRead":447},"Windows 8.1 TouchScreen Gaming Laptops","\u002Fwindows-8-touchscreen-gaming-laptops\u002F","\u002Fimages\u002Fhero\u002FFry-Shutup-And-Take-My-Money-1366x768.png",{"title":468,"permalink":71,"heroImage":422,"timeToRead":447},"Reactive Extensions (Rx) - Part 4 - Replacing Timers",{"title":470,"permalink":471,"heroImage":472,"timeToRead":344},"WPF Metro Part 3 - Elysium","\u002Fwpf-metro-part3-elysium\u002F","\u002Fimages\u002Fhero\u002FElysium-1366x768.png",{"title":474,"permalink":475,"heroImage":476,"timeToRead":477},"WPF Metro Part 4 - Elysium Extra","\u002Fwpf-metro-part4-elysium-extra\u002F","\u002Fimages\u002Fhero\u002FElysium-Extra-1366x768.png",8,{"title":479,"permalink":77,"heroImage":422,"timeToRead":450},"Reactive Extensions (Rx) - Part 5 - Awaiting Observables",{"title":481,"permalink":482,"heroImage":442,"timeToRead":477},"GetHashCode Made Easy","\u002Fgethashcode-made-easy\u002F",{"title":39,"permalink":83,"heroImage":422,"timeToRead":433},{"title":485,"permalink":486,"heroImage":487,"timeToRead":418},"Portable Class Library (PCL) version of NotificationsExtensions NuGet package","\u002Fportable-class-library-version-of-notificationsextensions-nuget-package\u002F","\u002Fimages\u002Fhero\u002FNuGet-1366x768.png",{"title":489,"permalink":490,"heroImage":491,"timeToRead":433},"Model-View-ViewModel (MVVM) - Part 1 - Overview","\u002Fmodel-view-viewmodel-mvvm-part1-overview\u002F","\u002Fimages\u002Fhero\u002FMVVM-1366x768.png",{"title":493,"permalink":494,"heroImage":491,"timeToRead":450},"Model-View-ViewModel (MVVM) - Part 2 - IDisposable","\u002Fmodel-view-viewmodel-mvvm-part2-idisposable\u002F",{"title":496,"permalink":497,"heroImage":491,"timeToRead":498},"Model-View-ViewModel (MVVM) - Part 3 - INotifyPropertyChanged","\u002Fmodel-view-viewmodel-mvvm-part3-inotifypropertychanged\u002F",11,{"title":500,"permalink":501,"heroImage":502,"timeToRead":447},"Naming Conventions","\u002Fnaming-conventions\u002F","\u002Fimages\u002Fhero\u002FNaming-Conventions-1366x768.png",{"title":504,"permalink":505,"heroImage":491,"timeToRead":506},"Model-View-ViewModel (MVVM) - Part 4 - INotifyDataErrorInfo","\u002Fmodel-view-viewmodel-mvvm-part4-inotifydataerrorinfo\u002F",12,{"title":508,"permalink":509,"heroImage":476,"timeToRead":450},"Elysium Extra 1.1 Released","\u002Felysium-extra-1-1-released\u002F",{"title":511,"permalink":512,"heroImage":513,"timeToRead":514},"ASP.NET Core Boilerplate","\u002Fasp-net-mvc-boilerplate\u002F","\u002Fimages\u002Fhero\u002FASP.NET-Core-Boilerplate-1366x768.png",7,{"title":516,"permalink":517,"heroImage":518,"timeToRead":519},"Internet Favicon Madness (Updated)","\u002Finternet-favicon-madness\u002F","\u002Fimages\u002Fhero\u002FFavicons-1366x768.png",17,{"title":521,"permalink":522,"heroImage":523,"timeToRead":514},"Custom Visual Studio Project Templates","\u002Fcustom-visual-studio-project-templates\u002F","\u002Fimages\u002Fhero\u002FVisual-Studio-1366x768.png",{"title":525,"permalink":526,"heroImage":523,"timeToRead":447},"Configuration File Transforms In Visual Studio Should Be Built In","\u002Fconfiguration-file-transforms-in-visual-studio-should-be-built-in\u002F",{"title":528,"permalink":529,"heroImage":513,"timeToRead":498},"Securing the ASP.NET MVC Web.config","\u002Fsecuring-the-aspnet-mvc-web-config\u002F",{"title":531,"permalink":89,"heroImage":422,"timeToRead":344},"Reactive Extensions (Rx) - Part 7 - Sample Events",{"title":533,"permalink":534,"heroImage":535,"timeToRead":536},"NWebSec ASP.NET MVC Security Through HTTP Headers","\u002Fnwebsec-asp-net-mvc-security-through-http-headers\u002F","\u002Fimages\u002Fhero\u002FNWebSec-1366x768.png",6,{"title":538,"permalink":539,"heroImage":540,"timeToRead":120},"Content Security Policy (CSP) for ASP.NET MVC","\u002Fcontent-security-policy-for-asp-net-mvc\u002F","\u002Fimages\u002Fhero\u002FContent-Security-Policy-CSP-for-ASP.NET-MVC-1366x768.png",{"title":542,"permalink":543,"heroImage":442,"timeToRead":433},"C# 6.0 - Saving Developers From Themselves","\u002Fc-6-0-saving-developers-from-themselves\u002F",{"title":545,"permalink":546,"heroImage":547,"timeToRead":548},"Building RSS\u002FAtom Feeds for ASP.NET MVC","\u002Fbuilding-rssatom-feeds-for-asp-net-mvc\u002F","\u002Fimages\u002Fhero\u002FRSS-And-Atom-1366x768.png",19,{"title":550,"permalink":551,"heroImage":552,"timeToRead":498},"Canonical URL's for ASP.NET 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