C# Task.Ignore方法代码示例

        public void Update(string offset, DateTime utcNow)
        {
            // if offset has not changed, do nothing
            if (string.Compare(entity.Offset, offset, StringComparison.InvariantCulture)==0)
            {
                return;
            }

            // if we've saved before but it's not time for another save or the last save operation has not completed, do nothing
            if (throttleSavesUntilUtc.HasValue && (throttleSavesUntilUtc.Value > utcNow || !inProgressSave.IsCompleted))
            {
                return;
            }

            entity.Offset = offset;
            throttleSavesUntilUtc = utcNow + persistInterval;
            inProgressSave = dataManager.UpsertTableEntryAsync(entity);
            inProgressSave.Ignore();
        }

        /// <summary>
        /// Adds a task to this activation.
        /// If we're adding it to the run list and we used to be waiting, now we're runnable.
        /// </summary>
        /// <param name="task">The work item to add.</param>
        public void EnqueueTask(Task task)
        {
            lock (lockable)
            {
#if DEBUG
                if (log.IsVerbose2) log.Verbose2("EnqueueWorkItem {0} into {1} when TaskScheduler.Current={2}", task, SchedulingContext, TaskScheduler.Current);
#endif

                if (state == WorkGroupStatus.Shutdown)
                {
                    ReportWorkGroupProblem(
                        String.Format("Enqueuing task {0} to a stopped work item group. Going to ignore and not execute it. "
                        + "The likely reason is that the task is not being 'awaited' properly.", task),
                        ErrorCode.SchedulerNotEnqueuWorkWhenShutdown);
                    task.Ignore(); // Ignore this Task, so in case it is faulted it will not cause UnobservedException.
                    return;
                }

                long thisSequenceNumber = totalItemsEnQueued++;
                int count = WorkItemCount;
#if TRACK_DETAILED_STATS
                if (StatisticsCollector.CollectShedulerQueuesStats)
                    queueTracking.OnEnQueueRequest(1, count);
                
                if (StatisticsCollector.CollectGlobalShedulerStats)
                    SchedulerStatisticsGroup.OnWorkItemEnqueue();
#endif
                workItems.Enqueue(task);
                int maxPendingItemsLimit = masterScheduler.MaxPendingItemsLimit.SoftLimitThreshold;
                if (maxPendingItemsLimit > 0 && count > maxPendingItemsLimit)
                {
                    log.Warn(ErrorCode.SchedulerTooManyPendingItems, String.Format("{0} pending work items for group {1}, exceeding the warning threshold of {2}",
                        count, Name, maxPendingItemsLimit));
                }
                if (state != WorkGroupStatus.Waiting) return;

                state = WorkGroupStatus.Runnable;
#if DEBUG
                if (log.IsVerbose3) log.Verbose3("Add to RunQueue {0}, #{1}, onto {2}", task, thisSequenceNumber, SchedulingContext);
#endif
                masterScheduler.RunQueue.Add(this);
            }
        }

        private void InitializeInternal(IQueueAdapter qAdapter, IQueueAdapterCache queueAdapterCache, IStreamFailureHandler failureHandler)
        {
            logger.Info(ErrorCode.PersistentStreamPullingAgent_02, "Init of {0} {1} on silo {2} for queue {3}.",
                GetType().Name, GrainId.ToDetailedString(), Silo, QueueId.ToStringWithHashCode());

            // Remove cast once we cleanup
            queueAdapter = qAdapter;
            streamFailureHandler = failureHandler;
            lastTimeCleanedPubSubCache = DateTime.UtcNow;

            try
            {
                receiver = queueAdapter.CreateReceiver(QueueId);
            }
            catch (Exception exc)
            {
                logger.Error(ErrorCode.PersistentStreamPullingAgent_02, "Exception while calling IQueueAdapter.CreateNewReceiver.", exc);
                throw;
            }

            try
            {
                if (queueAdapterCache != null)
                {
                    queueCache = queueAdapterCache.CreateQueueCache(QueueId);
                }
            }
            catch (Exception exc)
            {
                logger.Error(ErrorCode.PersistentStreamPullingAgent_23, "Exception while calling IQueueAdapterCache.CreateQueueCache.", exc);
                throw;
            }

            try
            {
                receiverInitTask = OrleansTaskExtentions.SafeExecute(() => receiver.Initialize(config.InitQueueTimeout))
                    .LogException(logger, ErrorCode.PersistentStreamPullingAgent_03, $"QueueAdapterReceiver {QueueId.ToStringWithHashCode()} failed to Initialize.");
                receiverInitTask.Ignore();
            }
            catch
            {
                // Just ignore this exception and proceed as if Initialize has succeeded.
                // We already logged individual exceptions for individual calls to Initialize. No need to log again.
            }
            // Setup a reader for a new receiver. 
            // Even if the receiver failed to initialise, treat it as OK and start pumping it. It's receiver responsibility to retry initialization.
            var randomTimerOffset = safeRandom.NextTimeSpan(config.GetQueueMsgsTimerPeriod);
            timer = RegisterTimer(AsyncTimerCallback, QueueId, randomTimerOffset, config.GetQueueMsgsTimerPeriod);

            logger.Info((int)ErrorCode.PersistentStreamPullingAgent_04, "Taking queue {0} under my responsibility.", QueueId.ToStringWithHashCode());
        }