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:)
