3. Async
connected programs
• No more callbacks!

4. C# 4.0 + VB 10.0
Dynamic + Language Parity
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Managed Code

5. Declarative
Dynamic Concurrent

7. C# 5.0 + VB 11.0
Asynchronous Programming
C# 4.0 + VB 10.0
Dynamic + Language Parity
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Managed Code

9. var data = DownloadData(...);
ProcessData(data);
DownloadDataAsync(... , data => {
ProcessData(data);
});

10. var data = DownloadData(...);
ProcessData(data);
DownloadDataAsync(... , data => {
ProcessData(data);
});

11. Demo

12. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

13. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

14. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

15. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

16. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

17. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

18. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

19. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}


20. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}


21. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}
 

22. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}
 

23. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

 

24. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

  

25. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}

   

26. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}
 
   

27. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}
  
   

28. async void DoWorkAsync() {
var t1 = ProcessFeedAsync("www.acme.com/rss");
var t2 = ProcessFeedAsync("www.xyznews.com/rss");
await Task.WhenAll(t1, t2);
DisplayMessage("Done");
} async Task ProcessFeedAsync(string url) {
var text = await DownloadFeedAsync(url);
var doc = ParseFeedIntoDoc(text);
await SaveDocAsync(doc);
ProcessLog.WriteEntry(url);
}
  
   

29. async Task<XElement> GetRssAsync(string url) {
var client = new WebClient();
var task = client.DownloadStringTaskAsync(url);
var text = await task;
var xml = XElement.Parse(text);
return xml;
}

30. async Task<XElement> GetRssAsync(string url) {
var client = new WebClient();
var task = client.DownloadStringTaskAsync(url);
var text = await task;
var xml = XElement.Parse(text);
return xml;
} Task<XElement> GetRssAsync(string url) {
var client = new WebClient();
var task = client.DownloadStringTaskAsync(url);
return task.ContinueWith(delegate
{
var text = task.Result;
var xml = XElement.Parse(text);
return xml;
});
}

31. Task<XElement> GetRssAsync(string url) {
var $builder = AsyncTaskMethodBuilder<XElement>.Create();
var $state = 0;
async Task<XElement> GetRssAsync(string url) { $a1;
TaskAwaiter<string>
var client = new WebClient(); Action $resume = delegate {
try {
var task = client.DownloadStringTaskAsync(url);
if ($state == 1) goto L1;
var text = await task; var client = new WebClient();
var xml = XElement.Parse(text); var task = client.DownloadStringTaskAsync(url);
$a1 = task.GetAwaiter();
return xml;
if ($a1.IsCompleted) goto L1;
} $state = 1;
$a1.OnCompleted($resume);
return;
L1: var text = $a1.GetResult();
var xml = XElement.Parse(text);
$builder.SetResult(xml);
}
catch (Exception $ex) { $builder.SetException($ex); }
};
$resume();
return $builder.Task;
}

32. Task<XElement> GetRssAsync(string url) {
var $builder = AsyncTaskMethodBuilder<XElement>.Create();
var $state = 0;
async Task<XElement> GetRssAsync(string url) { $a1;
TaskAwaiter<string>
var client = new WebClient(); Action $resume = delegate {
try {
var task = client.DownloadStringTaskAsync(url);
if ($state == 1) goto L1;
var text = await task; var client = new WebClient();
var xml = XElement.Parse(text); var task = client.DownloadStringTaskAsync(url);
$a1 = task.GetAwaiter();
return xml;
if ($a1.IsCompleted) goto L1;
} $state = 1;
$a1.OnCompleted($resume);
return;
L1: var text = $a1.GetResult();
var xml = XElement.Parse(text);
$builder.SetResult(xml);
}
catch (Exception $ex) { $builder.SetException($ex); }
};
$resume();
return $builder.Task;
}

33. Others…
Windows
Presentation ASP.NET
Foundation

35. try {
string[] videoUrls = await ScrapeYoutubeAsync(url); // Network-bound
Task<Video> t1 = DownloadVideoAsync(videoUrls[0]); // Start two downloads
Task<Video> t2 = DownloadVideoAsync(videoUrls[1]);
Video[] vids = await Task.WhenAll(t1, t2); // Wait for both
Video v = await MashupVideosAsync(vids[0], vids[1]); // CPU-bound
await v.SaveAsync(textbox.Text); // IO-bound
}
catch (WebException ex) {
ReportError(ex);
}

37. C# 5.0 + VB 11.0
Asynchronous Programming
C# 4.0 + VB 10.0
Dynamic + Language Parity
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Managed Code

38. Meta-programming Read-Eval-Print Loop
Class
public Foo
Language Field DSL Embedding
Object Model
private X
string
Source .NET
File
Source code Assembly
Source code
Source code Compiler Source code

39. Demo

40. http://aka.ms/mbl-tech
http://aka.ms/mbl-tech/devprev
http://aka.ms/mbl-tech/html5

41. Visual Studio Async CTP http://msdn.com/async

42. Microsoft “Roslyn” CTP http://msdn.com/roslyn