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ExcelDna
Excel-DNA - Free and easy .NET for Excel. This repository contains the core Excel-DNA library.
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you need to specify Guids and use an interface.See https://github.com/peno64/CSHARP_COM for a com example project and called from excel.
I would suggest to you to take a look into excel-dna, it's a pretty good project to build functions for excel. https://github.com/Excel-DNA/ExcelDna
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