cancellationtokensource

When I create a default CancellationToken I can see in the debugger that the CancellationToken has a CancellationTokenSource associated with it which is stored in the private m_source field: I am wondering how can that be as for structs the default keyword "will return each member of the struct initialized to zero or null depending on whether they are value or reference types" and CancellationTokenSource is a reference type. CancellationToken does have 2 constructors that set this field however they are irrelevant as default(CancellationToken) doesn't call constructors and new

I have some code that is validating some data by making calls to a number of other services. I start all of the calls in parallel and then wait until at least one of them finishes. If any of the requests fail, I don't care about the result of the other calls. I make the calls with HttpClient and I have passed an HttpMessageHandler in that does a bunch of logging. Essentially: protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { HttpResponseMessage response = null; try { response = await base.SendAsync(request,

I an creating a sample example to call link using WebClient using async and await method now I want to attach cancel async call functionality also. But I am not able to get CancellationTokenSource token and attach DownloadStringTaskAsync to this cancellation token. Following Is my code can anyone tell me how to accomplish this. private async void DoWork() { this.Cursor = Cursors.WaitCursor; Write("DoWork started."); cts = new CancellationTokenSource(); WebClient wc = new WebClient(); string result = await wc.DownloadStringTaskAsync(new Uri("http://gyorgybalassy.wordpress.com")); if (result

I have the following code : CancellationTokenSource cts = new CancellationTokenSource(); ParallelOptions po = new ParallelOptions(); po.CancellationToken = cts.Token; Task.Factory.StartNew(() => { if (Console.ReadKey().KeyChar == 'c') cts.Cancel(); Console.WriteLine("press any key to exit"); }); Parallel.ForEach(list, po, (algo) => { algo.Compute(); // this compute lasts 1 minute Console.WriteLine("this job is finished"); po.CancellationToken.ThrowIfCancellationRequested(); }); The list contains few elements. All the Compute methods have already been started when I press 'c'. When I press 'c',

I have a multi-threaded application where I need to cancel each task after a certain time, even if at the time of cancellation, they use unmanaged resources. Now I use the following code (for example, a console application). In a real application, the delay may occur in the unmanaged resource. static void Main() { for (int i = 0; i < 10; i++) { Task.Factory.StartNew(Do, TaskCreationOptions.LongRunning); } Console.ReadLine(); } private static void Do() { new Timer(Thread.CurrentThread.Abort, null, 1000, -1); try { Console.WriteLine("Start " + Task.CurrentId); Thread.Sleep(2000); Console

I created a small wrapper around CancellationToken and CancellationTokenSource . The problem I have is that the CancelAsync method of CancellationHelper doesn't work as expected. I'm experiencing the problem with the ItShouldThrowAExceptionButStallsInstead method. To cancel the running task, it calls await coordinator.CancelAsync(); , but the task is not cancelled actually and doesn't throw an exception on task.Wait ItWorksWellAndThrowsException seems to be working well and it uses coordinator.Cancel , which is not an async method at all. The question why is the task is not cancelled when I