两个列表的互补? [英] Complement of Two Lists?

问题描述

让我说我有一个字符串列表:

lets say I have a list of strings:

A，B，C，D

然后是另一个字符串列表

Then another list of strings

B，C，D

我想知道第一个列表中的哪些元素不在第二个列表中，所以结果将为A

I want to know what elements are in the first list that aren't in the second list, so the result would be A

我不知道执行此操作的扩展方法的名称.我知道我可以使用concat，union，intersect进行类似的列表比较，但是只是不知道要完成此特定任务的名称.

I don't know the name of the extension method to do this is. I know I can use concat, union, intersect for similar list comparisons, but just don't know the name to accomplish this particular task.

附录，我对重复项感兴趣，所以如果第一个列表是:

Addendum, I am interested in duplicates, so if the first list is:

A，A，A，B，C，D

A,A,A,B,C,D

第二个列表是

B，C，D

我想得到

A，A，A

谢谢！

推荐答案

您可以使用

You can use the Except Extension Method to get all elements in a list that are not in a second list:

var result = list1.Except(list2);

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