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C# 4.0 - Whats New
1. C# 4.0 – What’s new?
Venketash (Pat) Ramadass
Systems Architect & Managing Director
emediaIT
Email Address: pat.ramadass@emediait.com
Blog: http://patramadass.emediait.com
2. Before all of that...
Who here is primarily using VS 2003 and .NET 1.1?
Who here is primarily using VS 2005 and .NET 2.0?
Who here is primarily using VS 2008 and .NET 3.5?
◦ What features are you using?
WPF, WCF, WF LINQ etc?
Who has played with VS 2010 CTP?
◦ Available for download
3. Items we are going to Cover...
What’s new in VS 2010
What’s new in .NET 4.0
What’s new in c# 4.0
Questions
Note: All of these technologies are still new and are
still maturing through CTPs followed by Betas/RCs
5. What’s new in VS 2010 – General
.NET Framework 4.0
Tooling and Framework advancements that take advantage
of the latest trends including:
◦ Cloud Development
Windows Azure and similar
◦ Parallel Computing
Taking advantage of multi-core systems
Updated editor built in WPF
◦ Graphical view of source files, code coverage etc
Simplified and more powerful TDD
◦ Consume first declare second
7. What’s new in VS 2010 – Web Development
Full inclusion of:
◦ ASP .NET MVC
◦ JQuery
◦ Sliverlight
Improved JavaScript IntelliSense engine
Improved SharePoint tools and project templates
◦ VS 2010 Tools for SharePoint
Replacement for SharePoint Designer
8. What’s new in VS 2010 – SharePoint
Development
New Project Templates
Import content using WSP Import
10. What’s new in VS 2010 – Other
Windows 7 Development
◦ Updates to MFC to support Windows 7, including new UI elements
Office Business Application Development
◦ Build Office client applications that span multiple versions and target
32-bit/64-bit as using a single deployment package
“Dublin” and “Oslo” in pipeline
◦ “Dublin” will provide enhanced server capabilities, building on IIS for
WCF and WF application hosting
◦ “Oslo” is a modelling platform for model-driven applications
“M” Language – Authoring domains textually
Quadrant – Tool for authoring domains visually
Library of pre-built domain models
11. What’s new in VS 2010 – Team System -
Rosario
Who here uses VSTS and/or VSTFS?
◦ What features/aspects do you use?
Highlights include:
◦ “Democratizing” Application Lifecycle Management
Architectural consistency
Limiting “No-Repro” bugs
◦ Improved modelling
Technical and non-technical users
◦ Improved QA/Test Planning and execution
Microsoft Test Runner
◦ Snapshot of system data
◦ Partial/full video capture
Test Impact View
15. What’s new in .net 4.0 – Some Highlights
Updates to BCL – Base Class Lilbrary
Code Contracts
◦ System.Diagnostics.Contracts
◦ Language agnostic
◦ Specify Pre-conditions, post-conditions and objects
invariants
Parallel Extensions
◦ Task Parallel Library, Parallel LINQ
16. What’s new in .net 4.0 – Some Highlights
BigInteger
◦ System.Numerics.BigInteger
◦ Supports all standard Integer operations
Compression Improvements
◦ Removed 4GB stream limit
Various WCF and WF enhancements
ASP.NET
◦ Static Client Ids
◦ Chart Control
18. What’s new in c# 4.0
Onto why we’re actually here...
◦ Dynamic Lookup
◦ Named and Optional Arguments
◦ Features for COM Interop
◦ Variance
19. What’s new in c# 4.0 – Dynamic Lookup
New dynamic type
Resolution of method calls or field accesses is
deferred until runtime
Allows for calling or accessing identical methods
or properties across unrelated objects
21. What’s new in c# 4.0 – Dynamic Lookup
DLR – Dynamic Language Runtime is underlying
mechanism
This could be done before, using reflection or
interfaces etc, but it would require much more
work
Convenience comes with drawbacks
◦ Performance
Reflection is used underneath
◦ Only have runtime checking
22. What’s new in c# 4.0 – Named and Optional
Arguments
Historically multiple overloads were required to
achieve this type of thing in c#
◦ Named parameters were never possible
Now this can be done using the optional argument
syntax in a single constructor
23. What’s new in c# 4.0 – Named and Optional
Arguments Demo
24. What’s new in c# 4.0 – Features for COM
Interop
Dynamic import allows you to import COM APIs so that
variants are represented using dynamic type instead of
object. Code that looked like...
...could now look like...
25. What’s new in c# 4.0 – Features for COM
Interop
COM APIs use a lot of ref parameters. In c# 4.0 the
compiler allows you to omit the ref in COM APIs
“No PIAs’ Feature
◦ Ability to compile your application so that it does not
require the Primary Interop Assemblies.
◦ Instead a small portion of the PIA required is put directly
into the program’s assembly
26. What’s new in c# 4.0 – Variance
Variance is one of those things most of us don’t
often don’t have to think about
There are some cases which you may assume
should work that don’t however.
27. What’s new in c# 4.0 – Variance
The following example does not work even though
string obviously inherits from object
If it did, the following would have to work, which
goes against type safety
28. What’s new in c# 4.0 – Variance
There may however be times where you would
want to have this type of thing happening and for
it to happen safely
c# 4.0 allows for covariance and contravariance
through the new out and in keywords
29. What’s new in c# 4.0 – Covariance and
Contravariance Demo
30. Conclusion
A lot of great new technologies and tools coming
out very soon
There are some key advancements in both c# and
.net 4.0, so we should all be looking to familiarise
ourselves with them and take advantage when
they are available
Download VS 2010 CTP and go through the
Walkthroughs
31. References
http://www.microsoft.com/visualstudio/en-
us/products/2010/default.mspx
◦ Visual Studio 2010 main site and CTP download
◦ CTP is in the form of a VHD and some software
expired on it in January 2009. There are
workarounds.
http://channel9.msdn.com/pdc2008/TL26/
◦ Parallel Programming for Managed Developers with
Visual Studio 2010
http://patramadass.emediait.com
◦ This presentation, example code
