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What benefit do you get from using a Primary Interop Assembly (PIA)?

A primary interop assembly contains type definitions (as metadata) of types implemented with COM.

Only a single PIA can exist, which needs to be signed with a strong name by the publisher of the COM type library.

One PIA can wrap multiple versions of the same type library. 

A COM type library imported as an assembly can be a PIA only if it has been signed and published by the same publisher.

Therefore, only the publisher of a type library can produce a true PIA, that can be considered as the unit of an official type definition for interoperating with the underlying COM types.

Do you know that?

Think of the user and NOT yourself while designing. Next

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