New CSharp Language features 3.0 and 4.0: Difference between revisions

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== This Page is Work in Progress ==
'''The content for this page is being written and not complete yet. Its content should not be relied on at the moment.'''
== New features ==
== New features ==
=== C# 3.0 ===
=== C# 3.0 ===

Revision as of 14:18, 26 October 2011

This Page is Work in Progress

The content for this page is being written and not complete yet. Its content should not be relied on at the moment.


New features

C# 3.0

Implicitly Typed Local Variables (aka 'Local Variable Type Inference')

  • At first glance this feature looks like it does what the 'dreaded' VARIANT Type of Visual Basic 6 does, where it results in late-bound Type Inference which can cause very difficult-to-spot errors at runtime.
  • However, Implicitly Typed Local Variables result in early-bound strongly-typed code, which is way better as its VB 6 'colleague' as it can not cause those errors at run-time!
  • Only works for local variables in a method (that is, not for Class Fields or Method Arguments).
  • Usage
    • Use new var keyword for the declaration of such variables.
    • Should not be over-used as the source code is less explicit then when the Type it holds is stated explicitly.
    • Can be a time saver for declaration of long types, esp. Generic ones; there it fine to be used and actually can result in easier-to-read code.
  • Details: [1]

Anonymous Types

Auto-implemented Properties (aka 'Automatic Properties')

  • used already in the web server for conference backend. saves writing dumb code

Object Initializers

  • used by ext.net which is used by the web server for conference backend.

Collection Initializers, Dictionary Initializers

Partial Methods

  • Available in Partial Classes only.

Extension Methods

Lambda Expressions

  • Replace Anonymous Methods, which were new in C# 2.0.

LINQ

C# 4.0

Named Parameters

  • This looks most interesting for us.

Optional Parameters

  • This looks very interesting for us, too.

Dynamic Support

Variance

COM Interop

  • Probably not interesting for us as the OpenPetra Client should stay platform-independent (COM is available only on Windows OS's).
  • Could potentially be useful for optional plug-ins for the OpenPetra Client that would need COM to fulfill their roles, though. Obviously those plug-ins would work on only Windows OS's then.


Mono and new C# features

TODO

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