Question

Given an integer array

[1,2,3,4,1]

What is the easiest way to know where there exist a 1 (maybe linq)?

Answer 1

Use Enumerable.Any Method:

int[] yourArray = new int[] { 1, 2, 3, 4, 1 };
bool ifExists = yourArray.Any(r => r == 1);

This will return true if the number exists in the array. In the above code you can replace the value 1 with your int variable, you want to compare with.