linq distinct扩展
public static IEnumerable<TSource> DistinctBy<TSource, TKey> (this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) { HashSet<TKey> seenKeys = new HashSet<TKey>(); foreach (TSource element in source) { if (seenKeys.Add(keySelector(element))) { yield return element; } } }
使用方法如下(针对ID,和Name进行Distinct)
var query = people.DistinctBy(p => new { p.Id, p.Name });
若仅仅针对ID进行distinct:
var query = people.DistinctBy(p => p.Id);
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原文链接:https://blog.csdn.net/c1113072394/article/details/75330966/