T in class? AddRange ICollection?

Question

I try to do static class, add to icollection but i got some issues i cant seem to overcome. that is how i get so i can pass a ICollection in the method? cause T is that say

Answer 1

Depending on the collection type of your source list an alternative approach is to use List(T).ForEach, as in:

List source = ...
ICollection dest = ...

source.Foreach(dest.Add);

However, the readability of this is easy to dispute.