C # Asynchronous programming

Before asynchronous programming, give an example that is not asynchronous:

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 usingSystem.Diagnostics;//7 usingSystem.Net;//8 9 namespaceConsoleApplication6Ten { One     classmydownloadstring A     { -Stopwatch SW =NewStopwatch ();// -  the          Public voidDorun () -         { -             Const intLargenumber =6000000; - SW. Start (); +  -             intT1 = Countcharacters (1,"http://www.cnblogs.com"); +             intT2 = Countcharacters (2,"http://www.163.com"); A  atCounttoalargenumber (1, largenumber); -Counttoalargenumber (2, largenumber); -Counttoalargenumber (3, largenumber); -Counttoalargenumber (4, largenumber); -  -Console.WriteLine ("Chars in http://www.microsoft.com: {0}", T1); inConsole.WriteLine ("Chars in http://www.illustratedcsharp.com: {0}", T2); -         } to  +         Private intCountcharacters (intIdstringuristring) -         { theWebClient WC1 =NewWebClient (); *  $Console.WriteLine ("starting call {0}: {1, 4:n0} MS", ID, SW. Elapsed.totalmilliseconds);//start download page timePanax Notoginseng             stringresult = WC1. Downloadstring (NewUri (uristring));//official download page data -Console.WriteLine ("Call {0} completed: {1, 4:n0} MS", ID, SW. Elapsed.totalmilliseconds);//Complete Web Download the             //Console.WriteLine (result); +             returnresult. Length; A         } the  +         Private voidCounttoalargenumber (intIdintvalue) -         { $              for(Longi =0; I < value; i++) ; $  -Console.WriteLine ("End counting {0}: {1, 4:n0} MS", ID, SW. Elapsed.totalmilliseconds);//a loop end time, with the intention of delaying -  the         } -     }Wuyi     class Program the     { -         Static voidMain (string[] args) Wu         { -mydownloadstring ds =Newmydownloadstring (); About ds. Dorun (); $ Console.readkey (); -         } -  -     } A } + //Output: the //------------------------------------------------------------------------ - //starting call 1:1 ms $ //Call 1 completed:207 Ms the //starting call 2:207 Ms the //Call 2 completed:382 Ms the //End counting 1:424 Ms the //End counting 2:447 Ms - //End counting 3:469 Ms in //End counting 4:491 Ms the //Chars inhttp://www.microsoft.com: 41177 the //Chars inhttp://www.illustratedcsharp.com: 6870

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Asynchronous

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Diagnostics;//usingSystem.Net;//namespaceconsoleapplication1{classmydownloadstring {Stopwatch SW=NewStopwatch ();  Public voidDorun () {Const intLargenumber =6000000; Sw.            Start (); Task<int> T1 = Countcharactersasync (1,"http://www.163.com"); Task<int> t2 = Countcharactersasync (2,"http://www.qq.com"); Counttoalargenumber (1, Largenumber); Counttoalargenumber (2, Largenumber); Counttoalargenumber (3, Largenumber); Counttoalargenumber (4, Largenumber); Console.WriteLine ("Chars in http://www.164.com: {0}", T1.            Result); Console.WriteLine ("Chars in http://www.qq.com: {0}", T2.        Result); }        Private Asynctask<int> Countcharactersasync (intIdstringsite) {WebClient WC=NewWebClient (); Console.WriteLine ("String Call {0}: {1,4:n0} ms", ID, SW.            Elapsed.totalmilliseconds); stringRESULT1 =awaitWc. Downloadstringtaskasync (NewUri (site)); Console.WriteLine ("Call {0} completed: {1, 4:n0} MS", ID, SW.            Elapsed.totalmilliseconds); returnRESULT1.        Length; }        Private voidCounttoalargenumber (intIdintvalue) {             for(Longi =0; I < value; i++) ; Console.WriteLine ("End counting {0}: {1, 4:n0} MS", ID, SW.        Elapsed.totalmilliseconds); }    }    classProgram {Static voidMain (string[] args) {mydownloadstring DS=Newmydownloadstring (); Ds.            Dorun ();        Console.readkey (); }    }}/*String Call 1:2 msstring call 2:160 msend counting 1:261 msend counting 2:283 msend counting 3: 309 Msend Counting 4:334 mscall 1 completed:353 mschars inhttp://www.164.com: 6870Call 2 completed:954 mschars inhttp://www.qq.com: 599258---------------------------------------------------------------------starting call 1:1 Mscall 1 completed:255 msstarting call 2:255 mscall 2 completed:751 msend counting 1:785 msend Counting 2:808 msend counting 3:830 msend counting 4:852 mschars inhttp://www.microsoft.com: 6870Chars inhttp://www.illustratedcsharp.com: 599274*/

C # Asynchronous programming