1. /* LIFE RUNS ON CODE*/ Konstantinos Pantos Microsoft MVP ASP.NET
Software Solutions Architect

2. agenda C# 4 Language and Compiler features
Visual C# Integrated Development Environment (VS 2010) features
Parallel Programming in VS 2010

3. What’s New in C# 4.0

4. Dynamic Support 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
Visual C# 2010 provides support for late binding to dynamic types by introducing a new type, dynamic. This addition enables many new scenarios, including simplified access to COM APIs such as the Office Automation APIs, to dynamic APIs such as IronPython libraries, and to the HTML Document Object Model (DOM). For more information, see Using Type dynamic (C# Programming Guide) and dynamic (C# Reference).

5. Dynamic Support
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

6. Dynamic Demo

7. Dynamic support (Insight)
C# is statically typed language
How did it became dynamic?
DLR (Dynamic Language Runtime) in play

8. Dynamic Programming
DLR is additional libraries to fit the dynamic languages into the CLR
Store program/code as data
Caching mechanism for dynamic call
Provide language specific support

9. Dynamic Programming Pros Cons No risk of brittle class hierarchy
Need not implement all methods of interface
More flexible , highly productive
Cons
Developer needs thorough understanding of codebase
Misuse might lead to poor maintainability

10. Named and Optional Parameters
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

11. Named – Optional Demo

12. Variance
Variance is one of those things most of us don’t often have to think about comes naturally
There are some cases which you may assume should work that don’t however.

13. 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
IList<string> strings = new List<string>();
IList<object> objects = strings;
Objects[0] = 5;
String s = strings[0];

14. Covariance and Contravariance
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
Works only for interfaces and delegates
Works only for reference types
Actual bits don’t change

15. Covariance Contravariance Demo

16. Office programmability
Removes dependency on Office PIAs
Language enhancements
C# Optional Parameters, Named Arguments, Dynamic types

17. Demo: Excel Add In

18. Visual C# Integrated Development Environment

19. Call Hierarchy
Call Hierarchy enables navigation through code by displaying the following:
All calls to and from a selected method, property, or constructor
All implementations of an interface member
All overrides of a virtual or abstract member
Enables better understanding of how code flows and evaluation of the effects of changes to code.

20. Navigate To Search for a symbol or file in source code
Search for keywords that are contained in a symbol by using Camel casing and underscore characters to divide the symbol into keywords

21. Highlighting References
When you click a symbol in source code, all instances of that symbol are highlighted in the document.
You can move to the next or previous highlighted symbol, by CTRL+SHIFT+DOWN ARROW or CTRL+SHIFT+UP ARROW

22. Generate From Usage
Enables usage of classes and members before defining them.
Generate a stub for a class, constructor, method, property, field, or enum before defining it.
Minimizes interruption of workflow

23. IntelliSense Suggestion Mode
Two alternatives for IntelliSense statement completion
Completion mode
Suggestion mode Used when classes and members are used before they are defined

24. Live Semantic Errors
Wavy underlines which signal errors and warnings as you type has been extended to include constructs that are outside of method bodies.
Return types,
Parameter types,
Default values in method declarations

25. Visual C# IDE Demo

26. Parallel programming

27. Parallel Computing Features.
Parallel API
Parallel Profiling
Parallel debugger
Concurrency visualizer in VS2010

28. Parallel Programming Demo

29. Resources
What’s new in Visual C#
Visual Studio 2010
Parallel Computing
Daniel Moth

30. Thank you