Introduction to C# 3.0
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C# 3.0 introduced new functional programming features like LINQ, lambda expressions, and extension methods. LINQ allows querying data with query comprehension syntax translated into extension method calls. Lambda expressions add anonymous delegate syntax for functional programming. Extension methods allow adding methods to types without inheritance. C# 4.0 added dynamic typing support while maintaining static type safety. Future versions may include true metaprogramming, parallel execution, and additional functional programming features.
Introduction to C# 3.0
- 1. Overview of C# 3.0Presentation created by EriawanKusumawardhono, for RX Communica
- 2. C# 3.0 is?A part of .NET programming languages from MicrosoftIt is released with Visual Studio 2008 and .NET 3.5
- 3. Historical perspective of C# 3.0A quick tour of historical view
- 4. Beginning of C#C# was a first managed language to compete with JavaMicrosoft was lost in court because of J++ implementationC# 1.0 was designed and developed in 1999C# 1.0 has basic OOP of inheritance, polymorphismProperty mechanism is the same concept as VB 4.0+
- 5. C# is?Statically typed languageEarly boundBased on CLR and CTS of .NETAlso part of “curly braces” languages such as C, C++, Objective C, JavaImperative language as part of OOP
- 6. Managed language is simply virtualizationJust like Java runs in its VMVirtualization promotes cleaner environment, optimization, garbage collection, thread optimization within one “virtual” platformA light lose coupling between OS and application written in managed environment or virtualizationReduced OS version dependency and functionality
- 7. So why?It is simply, raising an abstraction, not adding abstractionFocusing more on what you want to be done, not how
- 8. The sample of adding abstraction: batch command
- 9. Raising level of abstraction
- 10. Conceptual difference of abstractionRaising abstractionIntended to be more declarativeDoes not hide the detail of underlying platformStill can access the OS API using P/Invoke in .NET and JNI in JavaAdding abstractionNot intended to be more declarativeOften creating more new conceptual topicsOften hide the detail of the underlying platform
- 11. What comes with C# 2.0Adding generics on type and method declarationGeneric type inference on methods and method parametersReflection granularityNullable typesIterator of “yield”Anonymous delegate
- 12. Current release of C#: 3.0Present state of C# (2009)
- 13. Continuous design from previous releasesNew features are based on previous releasesMaintaining runtime compatibility and based on CLR of .NET 2.0
- 14. C# 3.0 themeLINQFunctional programming in style
- 15. LINQ is build onQuery comprehensionExtension methodLambda expressionExpression treeProperty initializerAnonymous type initializerLocal variable type inference
- 16. Quick feature lookvar x = from c in db.customer where c.City ==“London” select c.Name, c.CityLocal type inferQuery comprehensionLambda expressionvar x = db.Customer .Where(c => c.City == “London”) .Select(c=> new {c.Name,c.City}Extension methodAnonymous object/type initializer
- 17. Query comprehensionAdapting SQL query of SELECTNot a real keyword in C#, it is a pseudo keywordSELECT, WHERE, ORDER BY, GROUP BY is then translated into calls to extension methods
- 18. Lambda Expression overviewIt is simply an anonymous delegate but with the functional math syntaxTaken from ideas in Lambda calculus
- 19. Extension methodsAdding static method to a class or interfaces without deriving itUse it wiselyCan be a bad smell in coding practice
- 20. Next is: C# 4.0Main theme: support for dynamic type
- 21. Overview of C# 4.0Dynamic typeCo and Contra varianceOptional and named parametersNo PIA
- 22. Beyond C# 4.0Compiler as a serviceTrue meta programmingMethod execution into multi core (parallel)Function purity
- 23. End