C＃任务工厂超时 [英] C# task factory timeout

问题描述

我在一个线程中执行一个漫长的过程操作和结果返回到功能继续。这里是我的code：

I have to execute a long process operation in a thread and continue by returning the result to a function. Here is my code :

Task<ProductEventArgs>.Factory.StartNew(() =>
    {
        try
        {
             // long operation which return new ProductEventArgs with a list of product

        }
        catch (Exception e)
        {
            return new ProductEventArgs() { E = e };
        }

    }).ContinueWith((x) => handleResult(x.Result), TaskScheduler.FromCurrentSynchronizationContext());

问题其实我没有超时。我想提出一个定时器，以便返回这样的事情：

The problem is actually I don't have a timeout. I want to put a timer in order to return something like this :

   new ProductEventArgs() { E = new Exception("timeout") }; 

如果达到超时。
不能使用的await /异步。
非常感谢！

if the timeout is reached. Can't use await/async. Thanks a lot !

推荐答案

这code做了你有什么恩$ P $这里pssed：

This code does what you have expressed here:

var timeout = TimeSpan.FromSeconds(5);

var actualTask = new Task<ProductEventArgs>(() =>
{
    var longRunningTask = new Task<ProductEventArgs>(() =>
    {
        try
        {
            Thread.Sleep(TimeSpan.FromSeconds(10)); // simulates the long running computation
            return new ProductEventArgs();
        }
        catch (Exception e)
        {
            return new ProductEventArgs() { E = e };
        }
    }, TaskCreationOptions.LongRunning);

    longRunningTask.Start();

    if (longRunningTask.Wait(timeout)) return longRunningTask.Result;

    return new ProductEventArgs() { E = new Exception("timed out") };
});

actualTask.Start();

actualTask.Wait();

Console.WriteLine("{0}", actualTask.Result.E); // handling E

正如你所看到 longRunningTask 与 TaskCreationOptions.LongRunning 选项创建的。这样，就会有专门的发为它的执行，通过占领一个线程不与线程池的正常行为干扰从那里太久 - 这将需要像IE用户界面的其他事情。 这很重要，长时间运行的任务

As you see longRunningTask is created with TaskCreationOptions.LongRunning option. That way it will have a dedicated Thread for it's execution and does not interfere with normal behavior of ThreadPool by occupying a thread from there for too long - which will be needed for other thing like i.e. UI. That's important for long running tasks.

请注意：然后，您可以处理 actualTask​​ 与 ContinueWith ，但我想前preSS的精髓在这里

Note: You could then handle actualTask with ContinueWith but I wanted to express the essence here.

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