How to select several specific elements in LINQ?

user_15355275 0
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I have a list of integers as mentioned below.

List<int> numbers=new List<int>(){1,2,3,4,5,6};

and I would like to select numbers, that are in an array of integers:

int[] somenumbers=new int[]{1,3,5};

how can I do this with LINQ?

linq c#
2 Answers

Try this

List<int> numbers = new List<int>() { 1, 2, 3, 4, 5, 6 };
int[] somenumbers = new int[] { 1, 3, 5 };
var result = numbers.Where(x => somenumbers.Contains(x));
user_142290270

You can use Intersect() to get the common elements between 2 IEnumerable<T>s :

List<int> numbers=new List<int>(){1,2,3,4,5,6};
int[] somenumbers=new int[]{1,3,5, 42};
    
var commonNumbers = numbers.Intersect(somenumbers);
Console.WriteLine(string.Join(", ", commonNumbers)); // 1, 3, 5

Note that the order of the collections to compare doesn't matter :

commonNumbers = somenumbers.Intersect(numbers);
Console.WriteLine(string.Join(", ", commonNumbers)); // 1, 3, 5

Try it yourself

user_83985490
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