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Alex Rivera
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MSDN's VS2010 Named and Optional Arguments (C# Programming Guide) tells us about optional parameters in C#, showing code like I'd expect: public void ExampleMethod(int required, string optionalstr = "default string", int optionalint = 10) Ok, but it also says: You can also declare optional parameters by using the .NET OptionalAttribute class. OptionalAttribute parameters do not require a default value. I read MSDN's OptionalAttribute page , and done searches online (which shows lots of people claiming OptionalAttribute parameters can't be consumed by C# -- I'm guessing these comments were made before C# 4?), but I can't find the answer to two questions: If I use OptionalAttribute to define a C# parameter as optional: what value will be used if I call that method and don't specify that parameter's value? will that value be evaluated at compile time or runtime?
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