COM interfaces issues: Please help!

[Skip]

Hi,

I have a class with some functions that I want to be available via COM
interop. I declared the interface, which the class is based on, like this:

[Guid("F2B5A004-9D1C-4fba-B8BE-D7C6B08618CD")]
public interface IA
{
[DispId(1)]
string Test();

[DispId(2)]
bool SaveChanges();

[DispId(3)]
bool SendResults();
}

Now, I want my class to also implement a second interface which is located
in another assembly (another C# project to which I made a reference in my
current project) that has the following definition:

public interface IB
{
bool UpdateInformati on();
}

I don't want any functions or properties from IB to be exported or available
through COM interop. Basically, I then defined my class like this:

[Guid("AAC98A5E-8AA5-49fb-B0D7-EE6E6902D1B8"),
ClassInterface( ClassInterfaceT ype.None)]
public class MyClass : IA, ExternalNamespa ce.IB
{ ... }

I made sure to implement every function from both interfaces. Now, when I
try to compile this solution without the "Register for COM interop" set to
true, everything is fine. But if I set the option to true, I get the
following error when compiling my current project (the one with the class
implementing the two interfaces):

COM Interop registration failed. Could not find a type library for assembly
'X'.

'X' is my external project referenced in the current project (it compiles to
a Class Library and does not have anything related to COM interop in it).

Why am I getting this error and how can I have a class inherit two
interfaces with only one enabled for COM interop.

Thanks a lot,

Skip.

[John Puopolo]

Re: COM interfaces issues: Please help!

Skip:

I've not tried this, but perhaps you can use the ComVisible attribute to
specifically hide the IB interface from COM interop? It appears from a
quick look at the doc that you can apply ComVisible fairly granularly.

Anyone else have thoughts on this?

John


"Skip" <Skip@discussio ns.microsoft.co m> wrote in message
news:AA0DBE66-A33C-4613-AC8E-41213E64F16D@mi crosoft.com...[color=blue]
> Hi,
>
> I have a class with some functions that I want to be available via COM
> interop. I declared the interface, which the class is based on, like[/color]
this:[color=blue]
>
> [Guid("F2B5A004-9D1C-4fba-B8BE-D7C6B08618CD")]
> public interface IA
> {
> [DispId(1)]
> string Test();
>
> [DispId(2)]
> bool SaveChanges();
>
> [DispId(3)]
> bool SendResults();
> }
>
> Now, I want my class to also implement a second interface which is located
> in another assembly (another C# project to which I made a reference in my
> current project) that has the following definition:
>
> public interface IB
> {
> bool UpdateInformati on();
> }
>
> I don't want any functions or properties from IB to be exported or[/color]
available[color=blue]
> through COM interop. Basically, I then defined my class like this:
>
> [Guid("AAC98A5E-8AA5-49fb-B0D7-EE6E6902D1B8"),
> ClassInterface( ClassInterfaceT ype.None)]
> public class MyClass : IA, ExternalNamespa ce.IB
> { ... }
>
> I made sure to implement every function from both interfaces. Now, when I
> try to compile this solution without the "Register for COM interop" set to
> true, everything is fine. But if I set the option to true, I get the
> following error when compiling my current project (the one with the class
> implementing the two interfaces):
>
> COM Interop registration failed. Could not find a type library for[/color]
assembly[color=blue]
> 'X'.
>
> 'X' is my external project referenced in the current project (it compiles[/color]
to[color=blue]
> a Class Library and does not have anything related to COM interop in it).
>
> Why am I getting this error and how can I have a class inherit two
> interfaces with only one enabled for COM interop.
>
> Thanks a lot,
>
> Skip.
>[/color]

[Skip]

Re: COM interfaces issues: Please help!

John,

Your solution seems to have solved my problem, thanks. Here's the
definition of my second interface if anyone ever reads this thread in the
future:

[ComVisible(fals e)]
public interface IB
{
bool UpdateInformati on();
}


Skip.

"John Puopolo" wrote:
[color=blue]
> Skip:
>
> I've not tried this, but perhaps you can use the ComVisible attribute to
> specifically hide the IB interface from COM interop? It appears from a
> quick look at the doc that you can apply ComVisible fairly granularly.
>
> Anyone else have thoughts on this?
>
> John
>
>[/color]