CODEWITHSUNDEEP
c#linqlistienumerable
Marco
Marco

Reputation: 1493

Find the indexes of the elements of a List presentin another List

I have two Lists: ListA and ListB. Some of the elements in ListB are contained in ListA, which contains also elements from other lists. My question is:

How can I find the indexes of the elements of ListA contained in ListB?

Lets say

ListA = [A B D E J]
ListB = [A B C H J K L M N O P R Q Z]

I want this result:

ListC = [0 1 -1 -1 4]

or just

ListC = [0 1 4]

Thank you!

Upvotes: 0

Views: 38

Answers (1)

jwg
jwg

Reputation: 5827

ListA.Select(x => ListB.IndexOf(x))

To understand this code you need to be able to understand both Select and IndexOf. Both are simple, common and important, so make sure you find out how to use them.

Upvotes: 3

Related Questions