Net 4 Features that Every developer should know

.NET 4.0 Enhancements that Every developer should know…
By Abhishek Sur
Website: www.abhisheksur.com
Email : contact@abhisheksur.com

.NET Framework 4.0
User Interface
Data Access
Services
ASP.NET
(WebForms, MVC, Dynamic Data)
Windows Presentation Foundation
Windows Workflow Foundation
Entity Framework
ADO.NET
Windows Communication Foundation
WinForms
LINQ to SQL
Data Services
(ODATA)
Core
Base Class Library
Dynamic Language Runtime
Languages
Managed Extensibility Framework
LINQ
Parallel Extensions
Common Language Runtime

Agenda

Language Enhancements

Named / Optional Parameters.
Long number of Parameter lists.
Most of them are not regularly used.
Developer needs to supply default values
Heavy use of Type.Missing
Comma counting is a pain
Difficult to remember parameters by position

Overload Of Overloads

Optional Parameters
Named Parameter

Dynamic in .NET 4.0
CLR is mostly static type
Compile time type checking
DLR added dynamism to .NET
Run time type checking
DLR is now part of .NET 4.0 API
Full support of IronRuby, IronPython

Dynamic Data Type
Isnt Object type dynamic already?
.NET already has var, why add dynamic?
Object – Static type, base class
var – is ALSO static type, compiler inferred
dynamic – Evaluation deferred
Build your own IDynamicObject

Demo
Dynamic Dispatch

Variance
Covariance
Similar to base reference to derived class
Covariance is applied to arrays, delegates
Should be used in output positions
Contravariance
Similar to derived instance passed to base
Should be used in input positions

Demo
Variance

New Data Types

New DataTypes
BigInteger
Can work with any numbers
ComplexNumber
Complex number implementation (real /imaginary)
Tuple
Generic implementation of record
Lazy
Implementation of Lazy initializer
SortedSet
Combination of SortedList and HashSet

Demo
Data Types

Framework Enhancements

Create reusable components
Don’t we already have reusable components?
No need to create infrastructure from scratch
MEF is dynamically composed
What’s so dynamic about it
Current plugin model tied to specific apps
Same component cannot be used across apps
Discoverable at runtime
Tagging for rich queries and filtering

MEF Architecture
Catalog
CustomExportProvider
CatalogExportProvider
AggregatingExportProvider
CompositionContainer
Part
Part
Part
Export
Import
Export
Import
Export
Import

MEF
Catalog
Discovers and maintain extensions
CompositionContainer
Coordinate creations and satisfy dependencies
ComposablePart
Are Imports and Exports that are composable to the Container

Demo

Parallelism in .NET 4.0
Don’t we have multithreading and ThreadPool?
Requires too much work
Requires understanding of nitty-gritties
Bifurcated thinking for single CPU vs. multi
What does parallelism bring in?
Make multicore programming simple
Automatcially handle single vs. multicore
Focus on “what” rather than “how”

Parallels in .NET
Task Parallel Library (TPL)
Task and Data Parallelism
LINQ to Parallel (PLINQ)
Use LINQ to implement parallelism on queries
Coordinated Data Structures
High performance collection classes which are lock free and thread safe
BlockingCollection, ConcurrentCollectionetc

Task Parallel Library
Write code which automatically uses multicore
Expose potential parallelism in sequential code
No language extension (aka Syntactic sugar) yet
Parallelism types
The Task Class – Task Parallelism
The Parallel Class – Data Parallelism

Demo
Parallel Framework

Code Contracts
Foundation
Design by contract
Based on MSR’s SPEC# (Pre/Post/Invariants)
What does it bring?
Improved testability
Static verification
How does it help?
Guarantee obligations on entry (parameter validations)
Guarantee property at exit (return value range)
Maintain property during execution (object invariance)

Code Contracts(continues…)
New namespace in .NET
System.Diagnostics.Contracts
Parameter validation
Contract.Requires()
Return value guarantee
Contract.Ensures()
Object state guarantee
Contract.Invariant()

Demo
Code Contracts

Questions / Answers

References
.NET 4.0 Features
http://www.abhisheksur.com/2010/06/c-40-features.html
http://dailydotnettips.com/2011/06/29/working-with-co-variance-and-contra-variance-in-net-4-0/
Data Types
http://goo.gl/fb/Wwu6E
MEF
http://mef.codeplex.com
Code Contract
http://www.abhisheksur.com/2011/02/code-contracts-in-net-40-its-internals.html

Abhishek Sur, MVP (Client App Dev)
www.abhisheksur.com
Email: contact@abhisheksur.com
Twitter : @abhi2434
Thank you.

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Net 4 Features that Every developer should know

by Abhishek Sur on Jul 03, 2011

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Net 4 Features that Every developer should know — Presentation Transcript