C# unique values from list (removing dupes entirely)

Question

How to achieve the following?

Input List: A,A,B,B,B,C,D,E,E,F

Expected Output List: C,D,F

Related: [Remove List elements that appear more than once, in place](https://stackoverflow.com/questions/36415957/remove-listt-elements-that-appear-more-than-once-in-place) — Theodor Zoulias, Jan 17 '23 at 15:15

score 3 · Accepted Answer · answered Jan 17 '23 at 14:11

You could use group by and take only groups with exactly one element:

var input = new string[] {"A","A","B","B","B","C","D","E","E","F"};
var result = input.GroupBy(x => x).Where(x => x.Count() == 1).Select(x => x.Key).ToList();

Online-demo: https://dotnetfiddle.net/j2vraK

C# unique values from list (removing dupes entirely)

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