新建一个类，实现IEqualityComparer接口。注意GetHashCode方法的实现，只有HashCode相同才会去比较
public class Compare:IEqualityComparer<Student>
{
public bool Equals(Student x,Student y)
{
return x.Id == y.Id;//可以自定义去重规则，此处将Id相同的就作为重复记录，不管学生的爱好是什么
}
public int GetHashCode(Student obj)
{
return obj.Id.GetHashCode();
}
}
调用：list.Distinct(new Compare()).ToList().ForEach(s => Console.WriteLine(s.ToString()));
列：
/// <summary> /// list对象去重 /// </summary> public class Compare : IEqualityComparer<HistoryStatisticsDTO> { /// <summary> /// /// </summary> /// <param name="x"></param> /// <param name="y"></param> /// <returns></returns> public bool Equals(HistoryStatisticsDTO x, HistoryStatisticsDTO y) { if (x == null || y == null) return false; if (x.CaseNumId == x.CaseNumId) { return true; } else { return false; } } /// <summary> /// /// </summary> /// <param name="obj"></param> /// <returns></returns> public int GetHashCode(HistoryStatisticsDTO obj) { if (obj == null) { return 0; } else { return obj.CaseNumId.GetHashCode(); } } }
调用： var list=historyStatistics.Distinct(new Compare()).ToList();
原文：https://www.cnblogs.com/zhangzhiping35/p/11881309.html