1. 12/2/2018 4:10 AM
© 2009 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.

2. Async Made Simple in Windows 8, with C# and Visual Basic
12/2/2018 4:10 AM
DEV332
Async Made Simple in Windows 8, with C# and Visual Basic
Dustin Campbell
Senior Program Manager
Microsoft Corporation
© 2007 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.

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. Using await with the Windows Runtime
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
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. Further reading and documentation
Async homepage:
What's New for Visual C# in Visual Studio 2012 RC:
What's New for Visual Basic in Visual Studio 2012 RC:

19. No more callbacks!

20. DEV Track Resources
Visual Studio Home Page ::
Somasegar’s Blog ::
Jason Zander’s Blog ::
Facebook ::
Twitter ::

21. Resources Learning TechNet http://europe.msteched.com
Connect. Share. Discuss.
Microsoft Certification & Training Resources
TechNet
Resources for IT Professionals
Resources for Developers

22. Submit your evals online
12/2/2018 4:10 AM
Evaluations
Submit your evals online
© 2007 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.

23. 12/2/2018 4:10 AM
© 2012 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.
© 2009 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.