Connecting to Excel with Interop

Friedrich Geisler-Buckert

Hi all,

i'm going crazy with the Interop.

This very simple progam in Visual Studio works fine

It just starts an empty EXCEL

Tryping to to the same with xpa 4.7:

Declaration of the variable works fine:

Trying to start a constructor:

"Can not create an instance of an abstract class or interface"

I can understand this message, but why is this in Visual studio possible?


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