How to use optional IDL parameters in .net

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Vinoth Kumar.V.K - 14 Dec 2004 11:13 GMT

Hi

I am using optional parameter in my interface method definition like this

HRESULT method( [in, optional] VARIANT vParameter)

I tried to call this method in .net . but .net doesn't accepting optional
paramteres.
that is, if i call the method without parameters , compilation error is
coming.

Can somebody suggest me how to use optional MIDL input parameters in .net?

Waiting for your replies

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Mattias Sj?gren - 14 Dec 2004 11:54 GMT

>I tried to call this method in .net . but .net doesn't accepting optional
>paramteres.
>that is, if i call the method without parameters , compilation error is
>coming.

That depends on which language you're using (.NET isn't a programming
language). VB.NET for example supports optional parameters, but C#
does not. In C# you instead pass in System.Type.Missing to any
optional VARIANT parameters.

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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