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Lidarr/NzbDrone.Common/IEnumerableExtensions.cs

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using System;
using System.Collections.Generic;
using System.Linq;
namespace NzbDrone.Common
{
public static class IEnumerableExtensions
{
public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
{
var knownKeys = new HashSet<TKey>();
return source.Where(element => knownKeys.Add(keySelector(element)));
}
}
}