CODEWITHSUNDEEP
c#performance
Nitendra Jain
Nitendra Jain

Reputation: 499

How to find if an element of a list is in another list and the name of element?

First I want to know if at least one element in a first list can be found in a second list.

List<string> list1 = new[] { "A", "C", "F", "H", "I" };
List<string> list2 = new[] { "B", "D", "F", "G", "L" };

I am using below code to do this - 

bool isFound = list1.Intersect(list2).Any();

But I want to know which element is that. Like in above case it is 'F'

What is the best way to do this?

Upvotes: 0

Views: 87

Answers (4)

Keren Caelen
Keren Caelen

Reputation: 1466

Instead of bool variable You can take another list variable like:

List<string> list3 Variable to get list of items which are forund in second list and assign the result to list3

 List<string> list3= list1.Intersect(list2).ToList();

Upvotes: 1

Edper
Edper

Reputation: 9322

Try:

        List<string> list1 = new List<string> { "A", "C", "F", "H", "I" };
        List<string> list2 = new List<string> { "B", "D", "F", "G", "L" };
        String sel = list1.Intersect(list2).FirstOrDefault()??"";

        Console.WriteLine(sel);

Try my Demo

Upvotes: 2

Soner G&#246;n&#252;l
Soner G&#246;n&#252;l

Reputation: 98810

You can use Enumerable.Intersect method only, you don't need to use Any in your case.

Produces the set intersection of two sequences.

List<string> list1 = new List<string>(){ "A", "C", "F", "H", "I" };
List<string> list2 = new List<string>(){ "B", "D", "F", "G", "L" };

var intersect = list1.Intersect(list2);

foreach (var i in intersect)
{
     Console.WriteLine(i);
}

Output will be;

F

Here is a DEMO.

Upvotes: 2

cuongle
cuongle

Reputation: 75316

You just use Intersect only:

var result = list1.Intersect(list2);

Upvotes: 4

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