C# .NET Core linq Distinct

var distinctUsers = allUsers
    .GroupBy(x => x.UserId)
    .Select(x => x.First())
    .ToList();

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4.13

Roger Bunting 85 points

                                    List&lt;Person&gt; distinctPeople = allPeople
  .GroupBy(p =&gt; new {p.PersonId, p.FavoriteColor} )
  .Select(g =&gt; g.First())
  .ToList();

Thank you! 8

4.13 (8 Votes)

4.33

Daniel V 170 points

                                    public static IEnumerable&lt;TSource&gt; DistinctBy&lt;TSource, TKey&gt;
    (this IEnumerable&lt;TSource&gt; source, Func&lt;TSource, TKey&gt; keySelector)
{
    HashSet&lt;TKey&gt; seenKeys = new HashSet&lt;TKey&gt;();
    foreach (TSource element in source)
    {
        if (seenKeys.Add(keySelector(element)))
        {
            yield return element;
        }
    }
}

Thank you! 6

4.33 (6 Votes)

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C# .NET Core linq Distinct

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