ZeroTouch List Input

Hello guys,

I created a class and a method. When I connect a single value to node it works but when I connect a list of strings, it does not loop over that list. I mean, the lacing should automatically do that…
an example could be Excel.cs:

If you connect 2 worksheets it automatically loops over it and export it to excel. How can I do like that?

Can you share your code?