LINQ Except()方法不起作用 [英] LINQ Except() Method Does Not Work

问题描述

我有2个IList<T>类型的对象ItemsDTO.我想从另一个列表中排除一个列表.但是，这似乎对我不起作用，我想知道为什么吗?

I have 2 IList<T> of the same type of object ItemsDTO. I want to exclude one list from another. However this does not seem to be working for me and I was wondering why?

IList<ItemsDTO> related = itemsbl.GetRelatedItems();
IList<ItemsDTO> relating = itemsbl.GetRelatingItems().Except(related).ToList();

我正在尝试从relating列表中删除related中的项目.

I'm trying to remove items in related from the relating list.

推荐答案

由于类是引用类型，因此您的ItemsDTO类必须覆盖Equals和GetHashCode才能起作用.

Since class is a reference type, your ItemsDTO class must override Equals and GetHashCode for that to work.

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