How to access an installed excel COM add-ins methods from C# code?

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I want to call a COM Add-in that is already installed in excel from my C# excel add-in. It is a third party add-in so I can't make any changes to the code.

I need to access the methods in the Add-in and get the value they return.

I know in VBA you can just call a COM Add-in and use it's methods, so is there a C# equivalent of that.

P.S I've tried using COM Classes and COM Wrappers, but it either isn't working or I'm not using them properly.

What I have tried:

I've tried using the DLL to call the methods but whichever way I call it, it returns an exception saying it can't find the xxx.cs class or that it can't find an entry point. I've also tried using an invoke method,but that doesn't work either.

Posted 6-Oct-16 5:34am

Nolii

Updated 6-Oct-16 9:08am

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#realJSOP · Answer 1 · 2016-10-06T06:30:00

Solution 1

Calling COM Components from .NET Clients[^]

Posted 6-Oct-16 6:30am

#realJSOP

Maciej Los · Answer 2 · 2016-10-06T09:08:00

Solution 2

I'd suggest to start here: Calling Code in VSTO Add-ins from Other Office Solutions[^] - Accessing Objects from Non-VBA Solutions part.

Posted 6-Oct-16 9:08am

Maciej Los

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Nolii 11-Oct-16 5:52am

I checked the link out, but it's a third party add-in so I can't change the code to expose the methods.