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Editorial Team
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Asked: 2026-06-15T18:25:07+00:00

AFAIK: Adding an optional parameter to a public method that’s called from another assembly

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AFAIK:

Adding an optional parameter to a public method that’s called from
another assembly requires recompilation of both assemblies— just as
though the parameter were mandatory.

I was wondering about WebService in this context.

What about me – using an added optional param webservice method?

for example :

lets say Google’s webservice method was : 

void DoWork(int a , int b)

and it was changed to 

void DoWork(int a , int b  , isDefault=false)
  • must I , as a consumer need to recreate the proxy file ?
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1 Answer

  1. Editorial Team

    My understanding is that optional parameters are syntactic sugar.

    You still end up with an overload that takes all parameters as mandatory, however the compiler will automatically insert the default for the optional parameter into the call site in the IL when it encounters a method call without the optional parameter specified.

    How this affects Web Services depends on how the optional parameter is propagated through the proxy.

    If it is a non-breaking change to the WSDL, then my guess is that it won’t make a difference, where you won’t need to regenerate the proxy, and the requests generated by the existing proxy will still be valid from a WSDL contract point of view.

    However, if it is a breaking change to the WSDL, then you would obviously need to regenerate the proxy, and any call sites into proxy methods would need to be recompiled.

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