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C# Version 3.0

C# Version 3.0

Released November, 2007

C# version 3.0 came in late 2007, along with Visual Studio 2008, though the full boat of language features would actually come with .NET Framework version 3.5. This version marked a major change in the growth of C#. It established C# as a truly formidable programming language. Let's take a look at some major features in this version:

  Auto-implemented properties
  Anonymous types
  Query expressions
  Lambda expressions
  Expression trees
  Extension methods
  Implicitly typed local variables
  Partial methods
  Object and collection initializers
In retrospect, many of these features seem both inevitable and inseparable. They all fit together strategically. It's thought that C# version's killer feature was the query expression, also known as Language-Integrated Query (LINQ).

A more nuanced view examines expression trees, lambda expressions, and anonymous types as the foundation upon which LINQ is constructed. But, in either case, C# 3.0 presented a revolutionary concept. C# 3.0 had begun to lay the groundwork for turning C# into a hybrid Object-Oriented / Functional language.

Specifically, you could now write SQL-style, declarative queries to perform operations on collections, among other things. Instead of writing a for loop to compute the average of a list of integers, you could now do that as simply as list.Average(). The combination of query expressions and extension methods made a list of integers a whole lot smarter
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