Stephen Toub: Task-Based Asynchrony with Async

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Stephen Toub goes deep into the design and architecture of the new Async features in C# and VB.NET, which rely heavily on .NET’s Task Parallel Library. You can get an early look at this new async programming model, available as the Async CTP, today!

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    The Discussion

    • User profile image
      Kang Su

      Wow, nice job Stephen (and team)! I'm going to play with this some, but it looks like I can start writing some of our UI in a more readable manner, rather than some of the craziness I'm doing now to keep a responsive UI. 

    • User profile image
      Djeez

      Very informative interview! I watched the other video's on async as well, but this was the best. What came somewhat as a surprise was the introduction of DataFlows, which in the interview appeared as a coincedence because of the CCR talks. So I wonder if we can have an interview on an overview of what this CTP brings us. I mean, we have learned about the basics, and now about DataFlows, but are there any more goodies?

      By the way, as a reassurance: I watched the video to the very end.

      Thanks a lot!

    • User profile image
      Rodney McKay

      @Charles: Watched it till the end and loved every single minute Wink
      Thank you Stephan, Thank you Charles. 

      Unfortunately we have to wait until Visual Studio 2012 right? Of course i can play with the CTP but it would be nice to have it ready for production code right away Smiley

      Another questions: if i use the async/await keywords on the UI-thread it is guaranteed that the code continues on the UI-thread. If i use it on any other thread, does it continue on a thread pool thread? It can't be the same thread that started the operation right?

    • User profile image
      Toub

      Hi Rodney-

      Regarding which thread things run on, awaiting a task attempts to resume execution in the same threading environment where the operation was suspended.  If there was a current SynchronizationContext when the await began, then execution will resume on that context (by Post'ing to it); otherwise, execution will begin on whatever TaskScheduler was current at the await.  This means that if you await on a UI thread, execution will continue on the UI thread.  If you await on a threadpool thread, you'll resume on a thread pool thread, though not necessarily the same thread that began the await.

    • User profile image
      Rodney McKay

      Thank you Stephen, great work!

      Last week i worked with HttpWebRequest and it looks like this:

      this.webRequest.BeginGetRequestStream(this.OnGetRequestStream, null);
      ...
      private void OnGetRequestStream(IAsyncResult ar)
         this.webRequest.EndGetRequestStream(ar);
         this.webRequest.BeginGetResponse(this.OnGetResponse, null);
      ...
      private void OnGetResponse(IAsyncResult ar)
        this.webRequest.EndGetResponse(ar);
      ...

      Looking forward to async/await Wink

    • User profile image
      ShinNoNoir

      Nice video. The stuff about ActionBlock and dataflow programming reminded me of coroutines in Python. Smiley

    • User profile image
      qwerty

      What about tail recursion in C#5.0? I think tail recursion and async will fit each other very well. Don't they?

    • User profile image
      koistya

      Thanks, Stephen. Great introduction video! That would be good to have some testing project with samples to play with.

    • User profile image
      Avner

      @koistya: You can download the Async CTP here http://msdn.microsoft.com/en-us/vstudio/async.aspx it contain many samples.

    • User profile image
      abhi2434

      Really cool, I liked the way he demonstrated.

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