如何在C＃中的数组执行set减法？ [英] How to perform set subtraction on arrays in C#?

问题描述

什么是执行在C＃中给出两个数组一套减法最简单的方法？显然，这是死很容易在Ruby中。基本上，我只是想从阵列 A 是在阵列 B 删除元素：

What's the simplest way to perform a set subtraction given two arrays in C#? Apparently this is dead easy in Ruby. Basically I just want to remove the elements from array a that are in array b:

string[] a = new string[] { "one", "two", "three", "four" };
string[] b = new string[] { "two", "four", "six" };
string[] c = a - b; // not valid

C 应该等于 {一，三化} 。 B - A 将产生 {六个一}

c should equal { "one", "three" }. b - a would yield { "six" }.

推荐答案

如果你正在使用LINQ，你可以使用的除了运营商的是这样的：

If you're using Linq, you can use the Except operator like this:

string [] c = a.Except(b).ToArray();

编辑： CodeInChaos使得一个好点。如果 A 包含重复，它将删除重复也。另一种方法，以使其功能完全一样的Ruby的版本将是这样的：

CodeInChaos makes a good point. If a contains duplicates, it will remove any duplicates as well. The alternative to make it function exactly like the Ruby version would be this:

string [] c = a.Where(x=>!b.Contains(x)).ToArray();

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