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I'm looking to write a library that uses the new optional parameters feature of C# 4.0, but I want to target it to the 3.5 version of the framework. Is this possible?
Are optional parameters syntactic sugar in the same way that extension methods are?
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Func(out i); then the answer is no you cant. also C# and . NET framework hast many many data structures that are very flexible like List and Array and you can use them as an output parameter or as return type so there is no need to implement a way to have optional output parameters.
The definition of a method, constructor, indexer, or delegate can specify its parameters are required or optional. Any call must provide arguments for all required parameters, but can omit arguments for optional parameters. Each optional parameter has a default value as part of its definition.
By Params Keyword: You can implement optional parameters by using the params keyword. It allows you to pass any variable number of parameters to a method. But you can use the params keyword for only one parameter and that parameter is the last parameter of the method.
With VS2010 RC, I was able to create a .NET 3.5 application that uses optional parameters in C#.
So yes, it's all about syntactic sugar.
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