.net - Optional VB Parameters are required in C# -


similar this, twist.

vb function declaration:

public shared function myfunc(byval name string, byval num integer, optional byref obj object = nothing, optional byval val integer = 0) boolean

when calling in c# (different solution, copied on .dll)

error 164 no overload method 'myfunc' takes 2 arguments

metadata shows function be:

public static bool myfunc(string name, int num, ref object obj, int val = 0);

why did 1 optional make through while other didn't?

c# doesn't support optional ref parameters. if change obj byvalue parameter, should fine.

if try declare optional ref parameter in c#, you'll violate section 10.6.1 of c# 4 spec:

a fixed-parameter default-argument known optional parameter.

...

a ref or out parameter cannot have default-argument.

the exception com, ref parameters extremely common. when c# compiler knows it's dealing com component, will allow omit optional ref parameters.


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