Question

根据http://blogs.msdn.com/b/pfxteam/archive/2009/05/31/9674669.aspx，具有未经处理的例外情况的任务应该删除应用程序。

然而在Task unhandled exceptions中，接受的答案表明在.NET 4.5中行为被改为不拆除应用程序，我试图重现MSVS 2013中的崩溃行为，我无法获得应用程序崩溃同时瞄准.NET 4.5（这是预期的），但即使我的目标是.NET 4.0，应用程序仍然继续检查通过弱引用，该任务不再存在。

 class Program
{
    private static WeakReference _ThrowingExceptionOnATaskRun()
    {
        Task t = Task.Factory.StartNew(() =>
        {
            Console.WriteLine("Throwing exception in a task!");
            throw new NotImplementedException("Not implemented");
        });

        return new WeakReference(t);
    }

    static void MyMain()
    {
        Console.WriteLine("Main start");

        WeakReference weakReference = _ThrowingExceptionOnATaskRun();

        CheckIfAlliveForceGc(weakReference);
        CheckIfAlliveForceGc(weakReference);
        CheckIfAlliveForceGc(weakReference);
        CheckIfAlliveForceGc(weakReference);

        Console.WriteLine("Enter something:");
        string userInput = Console.ReadLine();
        Console.WriteLine("You entered : {0}", userInput);
        Console.WriteLine("Done...");
        Console.Read();
    }

    private static void CheckIfAlliveForceGc(WeakReference weakReference)
    {
        Console.WriteLine("Is reference alive : {0}", weakReference.IsAlive);
        Thread.Sleep(2000);
        GC.Collect();
        GC.WaitForPendingFinalizers();
    }

    static void Main(string[] args)
    {
        MyMain();
    }
}

输出

Main start
Is reference alive : True
Throwing exception in a task!
Is reference alive : False
Is reference alive : False
Is reference alive : False
Enter something:
hello
You entered : hello
Done...

Answer 1

您需要在app / web.config中添加一个配置元素以保持旧行为：

<runtime>
    <ThrowUnobservedTaskExceptions enabled="true"/>
</runtime>

具有未处理异常的任务在针对.NET 4.0时不会崩溃

1 个答案: