是否可以取消使用 HostingEnvironment.QueueBackgroundWorkItem 进行的后台任务?
Is there a way to cancel background task made with HostingEnvironment.QueueBackgroundWorkItem?
有 CancellationToken 通知任务是否被取消,但是我该怎么办? 引用 https:// msdn。 microsoft/en-us/library/dd997396(v=vs.110).aspx
There is CancellationToken which notifies if tasks was cancelled but how can i do it? Refering to msdn.microsoft/en-us/library/dd997396(v=vs.110).aspx
成功取消涉及请求代码调用CancellationTokenSource.Cancel方法
A successful cancellation involves the requesting code calling the CancellationTokenSource.Cancel method
确定。经过几次试验后,我在哪里可以访问 CancellationTokenSource ?
OK. Where can i get access to CancellationTokenSource?
推荐答案提出了解决方案:
HostingEnvironment.QueueBackgroundWorkItem(ct => { var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(ct); var cancellationToken = linkedTokenSource.Token; return Task.Factory.StartNew(() => { // do stuff on background }, cancellationToken); });更新:
实际上,不需要任务。感谢svick提出来。 这是没有任务的更详细的代码示例。
Indeed, task is not needed. Thanks svick for bringing that up. Here is a bit more detailed code sample without task.
HostingEnvironment.QueueBackgroundWorkItem(ct => { var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(ct); // following is a dummy method, but you get the idea. // StoreCancellationTokenSourceSoItCanBeUsedSomewhereElse(linkedTokenSource); var cancellationToken = linkedTokenSource.Token; try { while(true) { cancellationToken.ThrowIfCancellationRequested(); // do bg stuff } } catch (OperationCanceledException ex) { // either token is in cancelled state } });更多推荐
如何取消HostingEnvironment.QueueBackgroundWorkItem
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