扩展类
public static class ObjectExtensions { 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; } } } }
对象:
/// <summary>
/// 返回题目数据
/// </summary>
[Serializable]
public class QuestionResult
{
/// <summary>
/// 编号
/// </summary>
public long Id { get; set; }
/// <summary>
/// 题目内容
/// </summary>
public string Title { get; set; }
}
用例:
list.DistinctBy(e => new { e.Id }).ToList();
原文：https://www.cnblogs.com/wfpanskxin/p/13129627.html