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POTask.Wait in ContinueWhenAll Action
 

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    <p>I was working on encorperating threads into my azure code for putting things on a queue. to do this i used <a href="http://www.microsoft.com/download/en/details.aspx?id=19222" rel="nofollow">http://www.microsoft.com/download/en/details.aspx?id=19222</a> as a reference. </p> <p>my code to enqueue multiple messages looks like this:</p> <pre><code>public void AddMessagesAsync(IEnumerable&lt;IQueueMessage&gt; messages, string queue = null, TimeSpan? timeToLive = null) { //check if we need to switch queues if (!String.IsNullOrEmpty(queue)) { SetCurrent(queue); } //setup list of messages to enqueue var tasks = new List&lt;Task&gt;(); Parallel.ForEach(messages, current =&gt; { if (timeToLive.HasValue) { //create task with TPL var task = Task.Factory.FromAsync(Current.BeginAddMessage, Current.EndAddMessage, Convert(current), timeToLive.Value, tasks); //setup continuation to trigger eventhandler tasks.Add(task.ContinueWith((t) =&gt; AddMessageCompleted(t))); } else { //create task with TPL var task = Task.Factory.FromAsync(Current.BeginAddMessage, Current.EndAddMessage, Convert(current), tasks); //setup continuation to trigger eventhandler tasks.Add(task.ContinueWith((t) =&gt; AddMessageCompleted(t))); } }); //setup handler to trigger when all messages are enqueued, a we are blocking the thread over there to wait for all the threads to complete Task.Factory.ContinueWhenAll(tasks.ToArray(), (t) =&gt; AddMessagesCompleted(t)); } private void AddMessagesCompleted(Task[] tasks) { try { //wait for all tasks to complete Task.WaitAll(tasks); } catch (AggregateException e) { //log the exception var ex = e; //return ex; } if (AddedMessages != null) { AddedMessages(tasks, EventArgs.Empty); } } </code></pre> <p>Now my question is about the Task.Wait in the continuation (which is according to the document provided by MS). it seems a bit strange to wait for threads where you already know the have completed right? the only reason i can imagine is to bubble the errors and process those. am i missing something here?</p>
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