Managed Code Generics Language Integrated Query Dynamic + Language Parity C# 5.0 + VB 11.0 Windows Runtime + Asynchrony C# 1.0 + VB 7.0 C# 2.0 + VB

www.buildwindows.com

Future directions for C# and Visual Basic

Anders HejlsbergTechnical FellowMicrosoft Corporation

TOOL-816T


Agenda

• What’s new in C# 5.0 and VB 11.0?• Asynchronous Metro style C#/VB applications• Hybrid C#/VB and Javascript applications• A look into the future: The Roslyn project


C# and VB evolution

Managed Code

Generics

Language Integrated Query

Dynamic + Language Parity

C# 5.0 + VB 11.0Windows Runtime + Asynchrony

C# 1.0 + VB 7.0

C# 2.0 + VB 8.0

C# 3.0 + VB 9.0

C# 4.0 + VB 10.0


What’s new?

C# 5.0

• Windows Runtime support• Asynchronous programming• Caller info attributes

VB 11.0

• Windows Runtime support• Asynchronous programming• Caller info attributes• Iterators


Asynchronous programming is becoming the norm in modern,

connected applications


Asynchronous programming models

• Windows Runtime: IAsyncOperation<T>• .NET Framework: Task<T>• Javascript: Promises• All are objects representing “ongoing operations”• All use callbacks to signal completion of operation• Challenge: Callbacks turn your code inside out• Insight: Automatic transformation to callbacks is

possible


Asynchronous methods automatically transform normal code into a callback

state machine

Asynchronous methods

public async Task<XElement> GetXmlAsync(string url) { var client = new HttpClient(); var response = await client.GetAsync(url); var text = response.Content.ReadAsString(); return XElement.Parse(text);}

public Task<XElement> GetXmlAsync(string url) { var tcs = new TaskCompletionSource<XElement>(); var client = new HttpClient(); client.GetAsync(url).ContinueWith(task => { var response = task.Result; var text = response.Content.ReadAsString(); tcs.SetResult(XElement.Parse(text)); }); return tcs.Task;}


Metro style asynchrony

demo


Asynchronous methods…

• Are marked with new “async” modifier• Must return void or Task<T>• Use “await” operator to cooperatively yield control• Are resumed when awaited operation completes• Can await anything that implements the “awaiter

pattern”• Execute in the synchronization context of their

caller• Allow composition using regular programming

constructs• Feel just like good old synchronous code!


C# and Javascript

demo


Caller Info attributes

__FILE__ and __LINE__ macros in C#?

Caller Info attributespublic static class Trace{ public static void WriteLine(string message, [CallerFilePath] string file = "", [CallerLineNumber] int line = 0, [CallerMemberName] string member = "") { var s = string.Format("{0}:{1} – {2}: {3}", file, line, member, message); Console.WriteLine(s); }}

void Initialize() { Trace.WriteLine("Starting services"); ...}

Trace.WriteLine("Starting services", "c:\\sources\\foo.cs", 1123, "Initialize");


C# and VB evolution

Managed Code

Generics

Language Integrated Query

Dynamic + Language Parity

C# 5.0 + VB 11.0Windows Runtime + Asynchrony

C# 1.0 + VB 7.0

C# 2.0 + VB 8.0

C# 3.0 + VB 9.0

C# 4.0 + VB 10.0


Class

Field

public Foo

private

string

X

The Roslyn project

CompilerCompilerSource codeSource code

SourceFile

Source codeSource code

.NET Assembly

Meta-programming Read-Eval-Print Loop

LanguageObject Model

DSL Embedding


Roslyn APIs

Language Service

Compiler APIs

Compiler Pipeline Syntax Tree API

Symbol APIBinding and Flow

Analysis APIsEmit API

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Visual Studio Roslyn CTP

announcing


Visual Studio Roslyn CTP

demo


Summary

• C# and VB deeply support the Windows Runtime

• C# and VB make asynchronous programming easy

• You can create hybrid C#/VB and Javascript apps

• Visual Studio Roslyn CTP will be available soon


For more information

• [PLAT-203T] Async everywhere: creating responsive APIs & apps

• [TOOL-531T] Using the Windows Runtime from C# and Visual Basic

• [SAC-804T] Building IIS and ASP.NET apps with the power of async

• [TOOL-810T] Async made simple in Windows 8, with C# and Visual Basic

• [TOOL-829T] The zen of async: Best practices for best performance

RELATED SESSIONS• Visual Studio Asynchronous

Programmingwww.msdn.com/vstudio/async

• What's New for Visual C# inVisual Studio 11 Developer Preview

• http://go.microsoft.com/fwlink/?LinkId=228087

• What's New for Visual Basic inVisual Studio 11 Developer Preview

• http://go.microsoft.com/fwlink/?LinkId=228088

DOCUMENTATION & ARTICLES

http://www.msdn.com/vstudio/async

http://go.microsoft.com/fwlink/?LinkId=228087





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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.

Documents

Managed Code Generics Language Integrated Query Dynamic + Language Parity C# 5.0 + VB 11.0 Windows Runtime + Asynchrony C# 1.0 + VB 7.0 C# 2.0 + VB