Task.Factory.StartNew不会抛出未处理的异常

Question

我有以下代码， methodThatThrowsException抛出异常获取静默，我该怎么抛出异常？

TaskScheduler scheduler = TaskScheduler.FromCurrentSynchronizationContext();
CancellationToken token = new CancellationToken();

Task task = Task.Factory.StartNew(MethodThatThrowsException)
                        .ContinueWith(t => { throw t.Exception; }, token, TaskContinuationOptions.OnlyOnFaulted, scheduler)
                        .ContinueWith(w => Vm.StatusMessage.StopProgressBar(), token, TaskContinuationOptions.OnlyOnRanToCompletion, scheduler);

Answer 1

您可以通过访问task.Exception属性来接收任务的异常。

   Task task = Task.Factory.StartNew(MethodThatThrowsException)
                    .ContinueWith(t => { throw t.Exception; }, token, TaskContinuationOptions.OnlyOnFaulted, scheduler)
                    .ContinueWith(w => Vm.StatusMessage.StopProgressBar(), token, TaskContinuationOptions.OnlyOnRanToCompletion, scheduler);

   System.Exception yourException = task.Exception;