Presentation about C# 5, F# 3 and VB11

2. Quem sou eu?
 Rodrigo Vidal
 Twitter: @rodrigovidal
 www.rodrigovidal.net
 Foco em Arquitetura de Software
 Evangelista da Linguagem F#
 Professional Scrum Developer
 Microsoft Student Partner

3. Evolução do C# e VB
C# 4.0 + VB 10.0
Dinamismo + paridade nas
linguagens
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Código gerenciado

4. Tendências
Declarativo
Dinâmico

5. Tendências
 Aplicações cada vez mais conectadas
 Mais latência
 Mais problemas de responsividade da interface gráfica
(IG)
 Mais problemas de escalabilidade
 Programação assíncrona
 Está se tornando a norma em aplicações escaladas e
responsivas
 APIs que são somente assíncronas, como JavaScript e
Silverlight

6. Evolução do C# e VB
C# 5.0 + VB 11.0
Programação assíncrona
C# 4.0 + VB 10.0
Dinamismo + paridade nas
linguagens
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Código gerenciado

7. O que há de novo?
 Programação assíncrona  Programação assíncrona
 Atributos de informação de  Atributos de informação de
chamada chamada
 Iterators
 Type Providers
 Query Expressions

8. Assincronia em poucas palavras
 Síncrono  Espero o resultado antes de retonar
 string DownloadString(...);
 Assíncrono  Retorne agora, chame de volta com
o resultado
 void DownloadStringAsync(..., Action<string> callback);
 Benefícios da assincronia
 Responsividade da interface gráfica: libera as threads de
IG para interação com o usuário
 Escalabilidade do servidor: A thread pode ser reutilizada
para outras requisições

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

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

11. Fluxo de controle assíncrono
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);
}

12. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Fluxo de controle assíncrono
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. Como funciona?
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;
}

29. Como funciona?
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. Como funciona?
Task<XElement> GetRssAsync(string url) {
var $builder = AsyncTaskMethodBuilder<XElement>.Create();
async Task<XElement> $state = 0;
var
TaskAwaiter<string> $a1;
GetRssAsync(string url) {
Action $resume = delegate {
var client = new try {
WebClient();
var task = if ($state == 1) goto L1;
client.DownloadStringTaskAsync(url);new WebClient();
var client =
var text = await task; task = client.DownloadStringTaskAsync(url);
var
$a1 = task.GetAwaiter();
var xml = XElement.Parse(text);
return xml; if ($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. Como funciona?
Task<XElement> GetRssAsync(string url) {
var $builder = AsyncTaskMethodBuilder<XElement>.Create();
async Task<XElement> $state = 0;
var
TaskAwaiter<string> $a1;
GetRssAsync(string url) {
Action $resume = delegate {
var client = new try {
WebClient();
var task = if ($state == 1) goto L1;
client.DownloadStringTaskAsync(url);new WebClient();
var client =
var text = await task; task = client.DownloadStringTaskAsync(url);
var
$a1 = task.GetAwaiter();
var xml = XElement.Parse(text);
return xml; if ($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. Como funciona?
Task<XElement> GetRssAsync(string url) {
var $builder = AsyncTaskMethodBuilder<XElement>.Create();
async Task<XElement> $state = 0;
var
TaskAwaiter<string> $a1;
GetRssAsync(string url) {
Action $resume = delegate {
var client = new try {
WebClient();
var task = if ($state == 1) goto L1;
client.DownloadStringTaskAsync(url);new WebClient();
var client =
var text = await task; task = client.DownloadStringTaskAsync(url);
var
$a1 = task.GetAwaiter();
var xml = XElement.Parse(text);
return xml; if ($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;
}

34. Como funciona?
Task<XElement> GetRssAsync(string url) {
var $builder = AsyncTaskMethodBuilder<XElement>.Create();
async Task<XElement> $state = 0;
var
TaskAwaiter<string> $a1;
GetRssAsync(string url) {
Action $resume = delegate {
var client = new try {
WebClient();
var task = if ($state == 1) goto L1;
client.DownloadStringTaskAsync(url);new WebClient();
var client =
var text = await task; task = client.DownloadStringTaskAsync(url);
var
$a1 = task.GetAwaiter();
var xml = XElement.Parse(text);
return xml; if ($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;
}

35. Suporte no .NET Framework

37. Evolução do C# e VB
C# 5.0 + VB 11.0
Programação assíncrona
C# 4.0 + VB 10.0
Dinamismo + paridade nas
linguagens
C# 3.0 + VB 9.0
Language Integrated Query
C# 2.0 + VB 8.0
Generics
C# 1.0 + VB 7.0
Código gerenciado

38. Compiler as a Service
Clas
Meta-programação s
Read-Eval-Print Loop (REPL)
public Foo
Fiel
Modelo de objetos d
Incorporação de DSLs
da linguagem
private X
string
Código Assembly
Source
Fonte Source
.NET
Source
code Compilador Source
code
code code

39. Roslyn APIs
Language
Service
Compiler
APIs
Compiler
Pipeline Metadata
Import

42. Conteúdo Relacionado
http://msdn.com/vstudio/async