Lab 1: C# 3.0 Language EnhancementsThe C# 3.0 language enhancements build on C# 2.0 to increase developer productivity: they make written code more concise and make working with data as easy as working with objects. These features provide the foundation for the LINQ project, a general purpose declarative query facility that can be applied to in-memory collections and data stored in external sources such as XML files and relational databases.
The C# 3.0 language enhancements consist of: · Auto-implemented properties, which automate the process of creating properties with trivial implementations. · Implicitly typed local variables, which permit the type of local variables to be inferred from the expressions used to initialize them. · Implicitly typed arrays, a form of array creation and initialization that infers the element type of the array from an array initializer. · Extension methods,which make it possible to extend existing types and constructed types with additional methods. · Lambda expressions,an evolution of anonymous methods that concisely improves type inference and conversions to both delegate types and expression trees. · Expression trees, which permit lambda expressions to be represented as data (expression trees) instead of as code (delegates). · Object and collection initializers, which you can use to conveniently specify values for one or more fields or properties for a newly created object, combining creation and initialization into a single step. · Query expressions, which provide a language-integrated syntax for queries that is similar to relational and hierarchical query languages such as SQL and XQuery. · Anonymous types, which are tuple types automatically inferred and created from object initializers.
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