使用取消令牌取消具有超时(在超时结束之前)的任务时,将引发异常.例:
mytask.start(); bool didTaskRunInTime = mytask.wait(5 mins,_cancelToken);
这意味着我不能继续下面.
//was the task cancelled if (_cancelToken.IsCancelRequested) { // log cancel from user to file etc } if (didTaskRunInTime ) { int taskResult = myTask.Result; // log result to file } else if (!_cancelToken.IsCancelRequested) { // Tell user task timed out,log a message etc }
解决方法
您可以使用该任务的数组调用
Task.WaitAny
.然后,您可以对任务的状态进行操作,但方法会返回.示例代码:
using System; using System.Threading; using System.Threading.Tasks; class Test { static void Main() { Task sleeper = Task.Factory.StartNew(() => Thread.Sleep(100000)); int index = Task.WaitAny(new[] { sleeper },TimeSpan.FromSeconds(0.5)); Console.WriteLine(index); // Prints -1,timeout var cts = new CancellationTokenSource(); // Just a simple wait of getting a cancellable task Task cancellable = sleeper.ContinueWith(ignored => {},cts.Token); // It doesn't matter that we cancel before the wait cts.Cancel(); index = Task.WaitAny(new[] { cancellable },TimeSpan.FromSeconds(0.5)); Console.WriteLine(index); // 0 - task 0 has completed (ish :) Console.WriteLine(cancellable.Status); // Cancelled } }
请注意,如果任务出现故障,您应该“观察”异常,以避免在最终确定时发生爆炸:)
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