How to: Wrap Multiple Versions of Type Libraries

Optionally, you can wrap more than one version of a type library. For example, you can indicate that a primary interop assembly supports type library versions 1.0 and 1.1.

To wrap multiple versions of a type library

1. Import a type library file:

   tlbimp LibUtil.tlb /primary /keyfile:CompanyA.snk /out:LibUtil.dll
   

2. Create a text file from the imported assembly by using the MSIL Disassembler (Ildasm.exe):

   ildasm LibUtil.dll /out:LibUtil.il
   

3. Using a text editor, insert a second PrimaryInteropAssemblyAttribute attribute below the attribute added by Tlbimp.exe. Include the major and minor version numbers that represent the second type library version.

4. Generate and sign a new assembly from the modified text file by using the MSIL Assembler (Ilasm.exe):

   ilasm LibUtil.il /dll /key:CompanyA.snk
   

See Also

Tasks

How to: Generate Primary Interop Assemblies Using Tlbimp.exe

Concepts

Generating Primary Interop Assemblies

Producing Primary Interop Assemblies