24 lines
626 B
C#
24 lines
626 B
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace AllBase.Extension
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{
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public static class LinqExtension
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{
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public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
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{
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HashSet<TKey> seenKeys = new HashSet<TKey>();
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foreach (TSource element in source)
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{
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if (seenKeys.Add(keySelector(element)))
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{
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yield return element;
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}
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}
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}
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}
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}
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