ConfigurationException: 'Types that inherit IEnumerable cannot be auto mapped' when using custom class based on DynamicObject (NOT ExpandoObject) which also implements IDictionary about csvhelper

[eduarddejong]

I already found the solution! :

Turns out it actually works without any problem. I needed to cast my object to dynamic in order to make it work with CsvWriter.

And this does not only apply to DynamicObject, but also to ExpandoObject.

I wasn't aware of this.

[JoshClose]

Were you using it as a dynamic object? Meaning

dynamic o = new ExpandoObject();

[eduarddejong]

Oh, whoops. I see now that it's only picking up the dynamic properties of my DynamicObject implementation, and not the other properties. But it's not such a problem.
I can still create an ExpandoObject and copy all the properties, I have already written some code in that direction inside a LINQ Select construct.
I realize I probably already want to do that because I also have custom column names which I need as CSV header as well.

Were you using it as a dynamic object? Meaning

dynamic o = new ExpandoObject();

Thanks for your reply! I am actually doing as dynamic now in my Select and that also works, which works effectively the same (I do not add the dynamic properties using dot notation, I fill it dynamically like dictionary. That's why I also didn't need to use the dynamic keyword initially).