如何創建週期性任務

Question

我有我正在移植到C＃4.0的C＃2.0代碼。我想利用System.Task代替System.ThreadPool.QueueueUserWorkItem。我也想用System.Task代替System.Threading.Timer。

如何創建週期性System.Task？我沒有看到System.Task或System.TaskFactory上的任何內容。

親切的問候審議，

pKumara

Answer 1

您可以Observable.Timer返回定時器可觀察到的序列嘗試。

Answer 2

使用Observable.Interval或Observable.Timer。定時器允許你通過一個dueTime

e.q.

  // Repeat every 2 seconds. 
     IObservable<long> observable = Observable.Interval(TimeSpan.FromSeconds(2)); 

     // Token for cancelation 
     CancellationTokenSource source = new CancellationTokenSource(); 

     // Create task to execute. 
     Action action = (() => Console.WriteLine("Action started at: {0}", DateTime.Now)); 
     Action resumeAction = (() => Console.WriteLine("Second action started at {0}", DateTime.Now)); 

     // Subscribe the obserable to the task on execution. 
     observable.Subscribe(x => { Task task = new Task(action); task.Start(); 
             task.ContinueWith(c => resumeAction()); 
     }, source.Token);