1. TechEd 2013
12/9/2018 4:17 AM
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

2. 12/9/2018 4:17 AM
DEV-B317
Easy Async for Windows Store Apps in Microsoft Visual C# and Microsoft Visual Basic
Alex Turner
Senior Program Manager
Managed Languages
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. The Future is the Future
Responsiveness and scalability
Async is becoming the norm
Futures: Modern abstractions
Details: Different but similar
Far more similar since Beta
.NET Async
Windows Runtime Async

4. Synchronous vs. Asynchronous
var data = DownloadData(...);
ProcessData(data);
STOP
ProcessData
DownloadData
var future = DownloadDataAsync(...);
future.ContinueWith(data => ProcessData(data));
DownloadDataAsync
ProcessData
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

5. Synchronous vs. Asynchronous
var data = DownloadData(...);
ProcessData(data);
STOP
ProcessData
DownloadData
STOP
var future = DownloadDataAsync(...);
future.ContinueWith(data => ProcessData(data));
DownloadDataAsync
ProcessData
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

6. C# and Visual Basic let you do asynchronous programming without callbacks

7. Demo
Using await with the Windows Runtime

8. async makes your method asynchronous

9. await makes the rest of your method a callback

10. Awaitables At Windows 8 Developer Preview
Task
Task<TResult>
Returned from async C# and Visual Basic APIs
Already running
await directly
Can await multiple times
Store and await later
IAsyncAction
IAsyncOperation<TResult>
Returned from async Windows Runtime APIs
Must be started
await directly
Can await only once
StartAsTask and await later

11. Awaitables At Windows 8 Release Preview/RTM
Task
Task<TResult>
Returned from async C# and Visual Basic APIs
Already running
await directly
Can await multiple times
Store and await later
IAsyncAction
IAsyncOperation<TResult>
Returned from async Windows Runtime APIs
Already running
await directly
Can await multiple times
Store and await later
Or, AsTask and await later

12. Task-returning vs. void-returning
async Task FooAsync(…);
Can be awaited
“Give back control”
Delegate asynchronous work
Use for helper methods
Use for library methods
async void Foo_Click(…);
Cannot be awaited
“Fire and forget”
Start separate independent flow
Use for event handlers
Use to override void methods

13. Demo
Coordinating Tasks

14. Task lets you coordinate activities

15. Task helpers Yielding control Background running Parallel composition
await Task.Delay(5000);
await Task.Yield();
Background running
var result = await Task.Run(() => { … work … });
Parallel composition
Task first = await Task.WhenAny(task1, task2);
var results = await Task.WhenAll(task1, task2);

16. Demo
Cancellation

17. Cancellation and Progress
Pass CancellationToken to send cancellation
Pass IProgress to receive progress updates
await FooAsync(…, cancel, progress);
await FooAsync(…).AsTask(cancel, progress);

18. Windows 8 has taken a big bet on asynchronous APIs

19. The await keyword makes consuming async APIs simple

20. No more callbacks!

21. Plan details and subscriber benefits
12/9/2018 4:17 AM
Plan details and subscriber benefits
Free Plan for up to 5 users
Included for certain paid MSDN subscribers:
Version control (TFVC or Git)
Comment on changesets & commits
Work item tracking and tagging
Team rooms
Agile planning tools
Feedback Management
Agile Portfolio Management*
Build*
Web-based test case management*
Load testing*
New!
Additional information at
* Capability in preview – limits may apply. Authoring load tests requires Visual Studio Ultimate 2013 Preview.
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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23. 12/9/2018 4:17 AM
More Async talks
Mon 1:15pm: Easy Async for Windows Store Apps in Microsoft Visual C# and Microsoft Visual Basic DEV-B317 – You are here
Tue 10:15am: Three Essential Tips for Using Async in Microsoft Visual C# and Visual Basic DEV-B319
Wed 8:30am: Creating Async Libraries That Are Modular, Reusable and Fast, in Microsoft Visual C# and Visual Basic DEV-B318
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

24. Resources Learning TechNet msdn http://channel9.msdn.com/Events/TechEd
12/9/2018 4:17 AM
Resources
Learning
Sessions on Demand
Microsoft Certification & Training Resources
TechNet
msdn
Resources for IT Professionals
Resources for Developers
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

25. Complete an evaluation on CommNet and enter to win!
12/9/2018 4:17 AM
Complete an evaluation on CommNet and enter to win!
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

26. 12/9/2018 4:17 AM
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© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

27. 12/9/2018 4:17 AM
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.