[C # Concurrent Programming Learning Note].net execution progress in asynchronous operation execution and canceling asynchronous operations

Reporting progress during asynchronous method execution you can use the progress<t> type, create an instance of the Progress<t> type, and add a report event to it as a parameter in the Async method. On the code:

We need to invoke the Async method:

1 /// <summary>2 ///asynchronous tasks that report progress and can be canceled3 /// </summary>4 /// <param name= "token" ></param>5 /// <param name= "Progress" ></param>6 /// <returns></returns>7  Public Static AsyncTask Progressasync (CancellationToken token, iprogress<Double> progress =NULL)8 {9  　　 DoublePercentComplete =0;Ten  　　 //loop execution when progress does not reach 100%, simulating a long-executed task One  　　  while(percentcomplete<= -) A  　　 { -  　　　　 //Judging Cancellation token -  　　　　 if(token.) iscancellationrequested) the  　　　　　　 return; -  　　　　 //report to Caller -Progress?. Report (PercentComplete); -  　　　　 awaitTask.delay (Timespan.fromseconds (1)); +PercentComplete + =Ten; -  　　 } +}

Call Method:

1 Static ReadOnlyCancellationTokenSource Token =NewCancellationTokenSource ();2 3 /// <summary>4 ///methods to invoke report progress5 /// </summary>6 /// <returns></returns>7 Private Async StaticTask progresstest () {8  　　 //creating an Progress instance9 　　 varprogress=Newprogress<Double>();Ten  　　 //Response Events When adding a report OneProgress. ProgressChanged + = (sender, args) = A  　　 { -Console.WriteLine ($"Current Progress {args}%"); -  　　 }; the  　　 //Invoke Report Method -  　　 awaitCharpt1.Charpt1.ProgressAsync (Token.token, progress); -}

The main method to execute is as follows:

1 Static voidMain (string[] args)2 {3  　　 progresstest ();4  　　 varKey =Console.readkey ();5  　　 //Cancel task When input character is J6  　　 if(Key. KeyChar = ='J')7  　　 {8  　　　　 Token.cancel ();9Console.WriteLine ("The task was canceled! ");Ten  　　 } One  　　 console.readline (); A}

When we do not cancel the task, we can see the following results

Enter ' j ' during execution to cancel the task with the following results:

[C # Concurrent Programming Learning Note].net execution progress in asynchronous operation execution and canceling asynchronous operations