What’s New & Hot in .NET 4.0?

Jess Chadwickblog.jesschadwick.comtwitter.com/jchadwick

About Me (Only one is true)

I invented the question mark.

I have several published magazine articles

I can swim the 100m breaststroke in under 1:30

The boring credentials…

Decade of development experience Recently turned independant consultant

Speaker & User Group Leader Microsoft MVP (ASP.NET) ASPInsider Writer

Blog: blog.jesschadwick.com Articles: in CoDe and DevConnections

magazines

What Is The .NET Framework?

Base Class Libraries

The CLRJIT & NGEN

Garbage Collector

Security Model

Exception Handling

Loader & Binder

WPFWin

FormsDLR

ASP.NET

WCF…and more!

LINQ-to-SQL

.NET 4.0 Overview: New & Updated

CLR & FRAMEWORK

The CLR The Base Class Library Performance, Concurrency

& Parallelization

New Languages (F#, IronPython)

Language Enhancements Dynamic Language

Runtime Code Contracts Managed Extensibility

Framework (MEF)

PLATFORMS

Entity Framework WPF Windows Workflow ASP.NET

ASP.NET MVC Web Forms ASP.NET AJAX

.NET 4.0 Overview: New & Updated

CLR & FRAMEWORK

The CLR The Base Class Library Performance, Concurrency

&Parallelization

New Languages Language Enhancements Dynamic Language

Runtime Code Contracts Managed Extensibility

Framework (MEF)

PLATFORMS

Entity Framework WPF Windows Workflow ASP.NET

ASP.NET MVC Web Forms ASP.NET AJAX

( Platform demos if we have time )

.NET Framework Improvements

The Goals of CLR 4

Working Better Together…

Faster…

With Fewer Bugs…

In-Proc SxS

Native/Managed InteropDLR Integration

Managed Extensibility Framework

Threading Parallel Extensions

Garbage Collection Profiling

Code Contracts DebuggingCorrupted State Exceptions

Base Class Library Additions

Numerics BigInteger

Data Structures Tuple (new

Tuple<int,int,string>(1,2,”Test”)) ISet<T> (SortedSet<T> & HashSet<T>)

I/O Memory-Mapped File

Performance, Concurrency, and Parallel Extensions

Thread-safe collections (BlockingCollection<T>, ConcurrentDictionary<T>, etc.)

Task Parallel Library (TPL)

PLINQ

Lazy Initializationeg: Lazy<IEnumerable<Order>> Orders { get; set;}

Code Contracts

Design By Contract

Code Contracts provide a

language-agnostic and

declarative way to express coding

assumptions in .NET programs.

A Code Contract contains…Pre-conditions: must be true

beforepublic Rational(int numerator, int denominator){Contract.Requires(denominator > 0); …}

Post-conditions: must be true afterpublic string GetPassword(){Contract.Ensures(Contract.Result<string>() != null); … return password;}

A Code Contract contains…

Invariants - must always be true[ContractInvariantMethod]protected void ObjectInvariant(){Contract.Invariant(denominator > 0);}

Code Contracts

Why are Contracts Useful?

• Debugging

• Tooling!• Pex

(research.microsoft.com/projects/pex/)

Language EnhancementsC#, Visual Basic, plus new Functional & Dynamic Languages

New C# 4.0 Features

1. Improved COM Inter-op

2. Named and Optional Parameters

3. Covariance and Contravariance

New VB10 Features

1. Auto-Implemented Properties

2. Collection Initializers

3. Statement Lambdas

4. Implicit Line Continuation

5. Covariance and Contravariance

New VB10 Features

1. Automatic Properties

2. Collection Initializers

3. Statement Lambdas

4. Implicit Line Continuation

5. Covariance and Contravariance

Covariance & Contravariance

“Fix” generics

Covariance

Describes the substitution of related types, such that the ordering from the more restrictive type to the less restrictive type is preserved

Covariance

Describes the substitution of related types, such that the ordering from the more restrictive type to the less restrictive type is preserved

class Derived : Base { }

IEnumerable<Derived> d = new List<Derived>();

IEnumerable<Base> b = d;

Contravariance

Describes the substitution of related types, such that the ordering from the more restrictive type to the less restrictive type is reversed.

Contravariance

Describes the substitution of related types, such that the ordering from the more restrictive type to the less restrictive type is reversed.

class Derived : Base { }

public void DoSomething(Action<Derived> func);

DoSomething((Base x) => x.Foo());

New Language Features

Emerging Language Trends

Declarative

ConcurrentDynamic

Emerging Language Trends

Declarative

ConcurrentDynamic

Introducing… F#!

F# Is… A functional programming language

derived from OCaml and the ML family of languages

Very good for computation-intensive problems, highly-parallel problems, and language-oriented programming

A first-class .NET 4.0 language, with full Visual Studio 2010 support

Emerging Language Trends

Declarative

ConcurrentDynamic

New C# 4.0 Features

1. Improved COM Inter-op

2. Named and Optional Parameters

3. Covariance and Contravariance

4. Late-binding support (via dynamic keyword)

(Will show up in our demos coming up next!)

Dynamic Language Runtime

Why a “Dynamic Language Runtime”?

Common Language Runtime

Statically-Typed

C#VB

RubyPython

Dynamically-Typed

Dynamic Language Runtime

PythonBinder

RubyBinder

COMBinder

JScriptBinder

ObjectBinder

.NET Dynamic Programming

Dynamic Language Runtime

Expression TreesDynamic Dispatch

Call Site Caching

IronPython

IronRuby C# VB.NET…

whatever!

Dynamic Language Runtime

Emerging Language Trends

Declarative

ConcurrentDynamic

Declarative Development

ASP.NET Web Forms (ASPX)

XAML (WPF & Silverlight)

Code Contracts

MEF!

Managed Extensibility Framework (MEF)

What is MEF?

MEF is… A way to manage dependencies

A way to provide extensibility in your apps

A framework to encourage loose coupling and reusability

A new addition to the Base Class Library System.ComponentModel.Composition

What is MEF? (Simple Answer)

Imports and Exports

What is MEF? (Simple Answer)

Imports and Exportsof components (“parts”)

What is MEF? (Complex Answer)

Imports and Exports of components (“parts”)

wired together via containers

Implementing MEF…and, heck – everything

else!

What’s New in the Platforms?WPF, ASP.NET, Workflow, etc!

Windows Presentation Framework (WPF)

Lots of Good Stuff for WPF Multitouch

Windows 7 taskbar

Windows 7 ribbon

Full Trust XBaps

Cached compositions

Textclarity

Layout rounding

ClickOnce improvements

Focus mgt improvements

Support for UIAccessible2

VSM integration

Media element improvements

Client profile

Data controls

Accessibility improvements

Control themes

Chart controls

… hundreds of good bug

fixes too!

Entity FrameworkIt’s not just for databases anymore!

EF4 Enhancements

Model-First Development

Persistence Ignorance (POCO support!)

Application Patterns (Repository, Unit of Work, etc.)

Customization of Queries & Generated Code

Windows Workflow

WF challenges today

Limited support for XAML-only workflows Versioning is problematic Composition difficult or impossible Writing custom activities and managing

data flow is not easy enough today Limited WCF integration and activity

support No generic server host environment Bottom line: A high bar to get to enough

value to make it worth the tax

Moving towards .NET 4.0

XAML-only workflows are the new default Unified model between WF, WCF, and WPF

Extended base activity library Simplified WF programming model Support for arguments, variables,

expressions Major improvements to WCF integration Runtime and designer improvements Hosting & management via "Dublin"

Extended base activity library .NET 4.0 comes with several new activities

Flow control• Flowchart• ForEach• DoWhile• Break

WCF• Send• Receive• SendReply• SendParameters• ReceiveParameter

s• CorrelationScope• InitializeCorrelatio

n• …

Others• Assign• MethodInvoke• Persist• Interop• PowerShellComm

and• ...

Microsoft is planning to ship more activities via CodePlex

New flow chart model

Flowcharts offer a middle ground between the sequential and state machine models

Simple step-by-step model, with decisions and switches

Allows you to return to previousactivities in the workflow

Improving the WebASP.NET MVC, Web Forms, and ASP.NET AJAX

ASP.NET MVC

v.2 “Officially” part of the framework New Features for v2:

Areas Data Annotations support Templated Helpers Client-Side Validation

Web Forms

• Client ID manipulation

• Fine-Grained ViewState control

ASP.NET AJAX

• Client-Side Templates

• Client-Side Data Controls (DataView &

DataContext)

• Declarative Instantiation

• Command Bubbling

• Live Bindings

Questions?Please complete the online evaluation form

Thank you!

Contact InfoEmail: jesschadwick@gmail.comBlog: blog.jesschadwick.comTwitter: twitter.com/jchadwick

Resources• Visual Studio 2010: msdn.microsoft.com/en-us/vstudio• MEF Homepage: mef.codeplex.com• DLR Homepage: dlr.codeplex.com• IronPython Homepage: ironpython.codeplex.com