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Asynchronously wait for Task<T> to complete with timeout12个
我试图为此代码添加超时,但因为我是新手,我无法弄清楚,
我试图为此代码添加超时,但因为我是新手,我无法弄清楚,
Task.Factory.StartNew(() =>
{
Aspose.Words.Document doc = new Aspose.Words.Document(inputFileName);
doc.Save(Path.ChangeExtension(inputFileName,".pdf"));
});
此外,我希望主线程在此等待,直到它超时5分钟或完成.
编辑
或者我可以使用取消令牌,如果是,那么如何:(？
解决方法
您可以使用Task.Delay创建一个新任务并使用Task.WhenAny：
Task delayedTask = Task.Delay(TimeSpan.FromMinutes(5));
Task workerTask = Task.Factory.StartNew(() =>
{
Aspose.Words.Document doc = new Aspose.Words.Document(inputFileName);
doc.Save(Path.ChangeExtension(inputFileName,".pdf"));
});
if (await Task.WhenAny(delayedTask,workerTask) == delayedTask)
{
// We got here because the delay task finished before the workertask.
}
else
{
// We got here because the worker task finished before the delay.
}
您可以使用Microsoft.Bcl.Async向.NET 4.0添加async-await功能
编辑：
当您使用VS2010时,您可以使用Task.Factory.ContinueWheAny：
Task.Factory.ContinueWhenAny(new[] { delayedTask,workerTask },task =>
{
if (task == delayedTask)
{
// We got here if the delay task finished before the workertask.
}
else
{
// We got here if the worker task finished before the delay.
}
});
编辑2：
由于Task.Delay在.NET 4.0中不可用,您可以使用扩展方法自己创建它：
public static class TaskExtensions
{
public static Task Delay(this Task task,TimeSpan timeSpan)
{
var tcs = new TaskCompletionSource<bool>();
System.Timers.Timer timer = new System.Timers.Timer();
timer.Elapsed += (obj,args) =>
{
tcs.TrySetResult(true);
};
timer.Interval = timeSpan.Milliseconds;
timer.AutoReset = false;
timer.Start();
return tcs.Task;
}
}
