两份清单C#的区别 [英] Difference of two lists C#

问题描述

我有两个字符串列表，它们都是〜300,000行.清单1比清单2多了几行.我想做的是在清单1中找到但不在清单2中的字符串.

I have two lists of strings both of which are ~300,000 lines. List 1 has a few lines more than List 2. What I'm trying to do is find the strings that in List 1 but not in List 2.

考虑到我必须比较多少个字符串，Except()是否足够好?还是有更好(更快)的东西?

Considering how many strings I have to compare, is Except() good enough or is there something better (faster)?

推荐答案

在内部，可枚举的Except扩展方法使用Set<T>进行计算.它将和其他方法一样快.

Internally the enumerable Except extension method uses Set<T> to perform the computation. It's going to be as least as fast as any other method.

选择list1.Except(list2).

它将为您提供最佳性能和最简单的代码.

It'll give you the best performance and the simplest code.

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