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Editorial Team
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Asked: 2026-05-17T18:11:55+00:00

I have this large IDL that I am importing into a C# project. Everything

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I have this large IDL that I am importing into a C# project.

Everything was fine until I had to use one interface that is not quite compatible with HRESULT -> COMException conversion (I can go into details here but that shouldn’t be relevant).

Is it possible to add PreserveSig to that one type somehow? I would like to avoid the option of declaring all COM interfaces manually in C#. If there was a way to get a c# source file instead of assembly from tlbimp, that would suit me, but AFAIK there is no such way.

Any other options? Thanks.

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1 Answer

  1. Editorial Team

    You could decompile the interop library with Ildasm.exe, edit the declaration and put it back again with ilasm.exe. Use a sample C# declaration to know how to edit it.

    Or you could just declare that one interface in C#. The name doesn’t matter, only the GUID has to match. Open the interop library in Reflector and copy/paste the interface declaration into your C# code. Change the interface name and modify the method that causes the problem.

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