score:0
Accepted answer
You can use Aggregate:
options.Aggregate((current, next) => current + ", " + next);
Note that this generates a new string for each operation, so if your options list is long you are better off using an old school approach with StringBuilder
score:3
While Aggregate will work it has O(n2) performance. If you need better performance you can use string.Join. Unfortunately this method doesn't accept an IEnumerable<string> so you have to also use ToArray to get what you want:
string.Join(", ", options.Select(o => o.Name).ToArray())
Source: stackoverflow.com
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