Invoking methods with optional parameters through reflection

Question

I\'ve run into another problem using C# 4.0 with optional parameters.

How do I invoke a function (or rather a constructor, I have the ConstructorInfo ob

Answer 1

All questions disappear as you see your code decompiled:

c#:

public MyClass([Optional, DefaultParameterValue("")]string myOptArg)

msil:

.method public hidebysig specialname rtspecialname instance void .ctor([opt]string myOptArg) cil managed 

As you see, optional parameter is a real separate entity that is decorated with specific attributes and has to be respected accordingly when invoking via reflection, as described earlier.