score:2
Accepted answer
You must use SelectMany.
If you use Select, then you get a Enumerable<List<Node>>, with SelectMany, you get only a List<Node>
List<Node> exitNodes = gateways.SelectMany(gw => gw.Connections).Select(node => node).ToList();
The answer in this post explains the difference between SelectMany and Select:
https://stackoverflow.com/a/959057/5056173
Source: stackoverflow.com
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