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Showing posts with the label Named parameter

Named parameters revisited in .Net 4.5

As most of you are aware that there are lot of language and compiler changes has happened with recent release of .Net, but all the issues will not arise until and unless you are recompiling your code. Once you recompile your code, these changes will be introduced regardless of which framework you target. Today I am writing about one of these breaking changes happened in .Net 4.5.  With earlier framework, named and optional parameter concept was introduced and unfortunately it was implemented incorrectly. In essence, there was a issue with the evaluation order of named parameter and will occur only when you are using methods as an argument.  Let's have a look at this snippet taken from MSDN: Expected output: A C B Output in Visual Studio 2010: C B A Output in Visual Studio 2012/2013: A C B Hope by this time, you are convinced about this incorrectness.  Please note, here issue is with named parameters and has nothing to do with optional parameters. This iss