/// <summary> /// 用于Linq的去重,扩展方法需要放到静态类中 /// </summary> /// <typeparam name="TSource"></typeparam> /// <typeparam name="TKey"></typeparam> /// <param name="source"></param> /// <param name="keySelector"></param> /// <returns></returns> 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; } } } 调用方法: list.DistinctBy(tmp => new { tmp.CountryName, tmp.VisaTypeName });