UnobservedTaskException被抛出，但它由TaskScheduler.UnobservedTaskException处理程序和一个continuation OnlyOnFaulted处理程序处理
可能重复：
使用任务并行库时如何处理所有未处理的exception？
@Buu Nguyen
嗨，解决scheme是基于你的想法
有人把它尽可能重复，这里有一些不同的东西。 我告诉了答案，这个想法帮助我。 有我的评论。
我在TPL编程方面遇到问题。
即时通讯UnobservedTaskException，即时通讯使用@ h4165f8ghd4f854d6f8h解决scheme[ 任务的exception（s）没有观察到通过等待任务或访问其exception属性。 因此，未观察到的exception是处理exception，但仍然得到UnobservedTaskException。
在启动任务之前，我也提供了以下代码：
TaskScheduler.UnobservedTaskException += (sender, e) => { e.SetObserved(); throw e.Exception; }; 但[ exception抛出任务线程，没有被UnobservedTaskException捕获 ]告诉它不捕获每个TPL未处理的exception。
我想泡沫例外，直到达到堆栈顶部，然后处理它。
有人可以帮助我？
@Jon Skeet
嗨，我做得更小了
现在编辑它
感谢您的参与
做了更多
class Program { static void Main(string[] args) { Program p = new Program(); p.tplTestOne(); } public void tplTestOne() { //------------------------------------------------- MyClassHere.onUnobservedTaskException += (object sender, EventException e) => { Console.WriteLine(e.Exception.Message); //its fired OK }; TaskScheduler.UnobservedTaskException += (object sender, UnobservedTaskExceptionEventArgs e) => { Console.WriteLine(e.Exception.Message); // its not fired, buggy }; //------------------------------------------------- CancellationTokenSource source = new CancellationTokenSource(); Task tz = MyClassHere.CreateHandledTask( new TaskScheduled(0, () => { if (!source.IsCancellationRequested) { Console.WriteLine("A-main-task-started"); } Thread.Sleep(5000); if (source.IsCancellationRequested) { Console.WriteLine("CancelingMainTask"); } }) , new TaskScheduled(3000, () => { Console.WriteLine("okTaskCalled"); }) , null //new TaskScheduled(0, () => { Console.WriteLine("cancelTaskCalled"); }) , TaskCreationOptions.AttachedToParent , source.Token , new TaskScheduled(2000, () => { if (!source.IsCancellationRequested) { Console.WriteLine("B-timeout"); } }) , new TaskScheduled(1000, () => { if (!source.IsCancellationRequested) { Console.WriteLine("C-timeout"); } source.Cancel(); }) ); if(tz != null) { tz.ContinueWith(t => { Console.WriteLine("END"); }); } Task tsk_1 = MyClassHere.createHandledTask(() => { double x = 1; x = (x + 1) / x; }, false); Task tsk_2 = MyClassHere.createHandledTask(() => { double y = 0; throw new Exception("forced_divisionbyzerodontthrowanymore_test"); // here -> System.Exception was unhandled by user code }, true); Task tsk_3 = MyClassHere.createHandledTask(() => { double z = 1; z = (z + 1) / z; }, true); Task tsk_4 = MyClassHere.createHandledTask(() => { double k = 1; k = (k + 1) / k; }, true); Console.ReadLine(); } } public class EventException : EventArgs { public Exception Exception; public Task task; public EventException(Exception err, Task tsk) { Exception = err; task = tsk; } } public class TaskScheduled { public int waitTime; public Action action; public DateTime datestamp; public bool isCalled = false; public TaskScheduled(int _waitTime, Action _action) { this.waitTime = _waitTime; this.action = _action; } } public static class MyClassHere { public delegate void UnobservedTaskException(object sender, EventException e); public static event UnobservedTaskException onUnobservedTaskException; //------------------------------------------------- public static void waitForTsk(Task t) { try { t.Wait(); } catch (AggregateException ae) { ae.Handle((err) => { throw err; }); } } //------------------------------------------------- public static void RaiseUnobsrvEvtForEachIfHappens(this Task task) { task.ContinueWith(t => { var aggException = t.Exception.Flatten(); foreach (var exception in aggException.InnerExceptions) { onUnobservedTaskException(task, new EventException(exception, task)); } }, TaskContinuationOptions.OnlyOnFaulted); // not valid for multi task continuations } //------------------------------------------------- public static Task CreateHandledTask(Action action) { return CreateHandledTask(action, false); } public static Task CreateHandledTask(Action action, bool attachToParent) { Task tsk = null; tsk = CreateHandledTask(action, attachToParent, CancellationToken.None); return tsk; } public static Task CreateHandledTask(Action action, bool attachToParent, CancellationToken cancellationToken) { Task tsk = null; TaskCreationOptions atp = TaskCreationOptions.None; if (attachToParent) { atp = TaskCreationOptions.AttachedToParent; } tsk = CreateHandledTask(action, atp, cancellationToken); return tsk; } public static Task CreateHandledTask(Action action, TaskCreationOptions tco, CancellationToken cancellationToken) { Task tsk = null; tsk = Task.Factory.StartNew(action, cancellationToken, tco, TaskScheduler.Default); tsk.RaiseUnobsrvEvtForEachIfHappens(); return tsk; } public static Task CreateHandledTask(TaskScheduled mainTask, TaskScheduled onSuccessTask, TaskScheduled onCancelationTask, TaskCreationOptions tco, CancellationToken cancellationToken, params TaskScheduled[] timeouts) { Task tsk = null; ManualResetEvent me = new ManualResetEvent(false); if (timeouts == null || timeouts.Length < 1 || timeouts[0] == null) { tsk = CreateHandledTask(mainTask.action, tco, cancellationToken); me.Set(); } else { bool isCancelation = false; bool isSuccess = true; Task NonBlockCtxTask = CreateHandledTask(() => { tsk = CreateHandledTask(mainTask.action, tco, cancellationToken); me.Set(); int qtdt = timeouts.Count(st => st.action != null); CountdownEvent cde_pas = new CountdownEvent(3); CountdownEvent cde_pat = new CountdownEvent(qtdt); Parallel.ForEach<TaskScheduled>(timeouts, (ts) => { try { bool itsOnTime = tsk.Wait(ts.waitTime, cancellationToken); cde_pat.Signal(); if (!itsOnTime) { isSuccess = false; Task tact = CreateHandledTask(ts.action, TaskCreationOptions.None, cancellationToken); } } catch (OperationCanceledException oce) { isSuccess = false; cde_pat.Signal(cde_pat.CurrentCount); isCancelation = true; } }); try { isSuccess &= cde_pat.Wait(System.Threading.Timeout.Infinite, cancellationToken) && !isCancelation; } catch (OperationCanceledException oce) { isCancelation = true; isSuccess = false; } finally { cde_pas.Signal(); } try { if (isCancelation && onCancelationTask != null) { Thread.Sleep(onCancelationTask.waitTime); Task tcn = CreateHandledTask(onCancelationTask.action); } } catch { } finally { cde_pas.Signal(); } try { if (isSuccess && onSuccessTask != null) { Thread.Sleep(onSuccessTask.waitTime); Task tcn = CreateHandledTask(onSuccessTask.action); } } catch { } finally { cde_pas.Signal(); } cde_pas.Wait(System.Threading.Timeout.Infinite); }, TaskCreationOptions.None, cancellationToken); } me.WaitOne(); return tsk; } //------------------------------------------------- }
谢谢
我把解决scheme放在问题主体上。
该解决scheme基于如何处理使用任务并行库时的所有未处理的exception？
