Intersection of two string array (ignore case)

Question

I have two arrays:

string[] array1 = { \"Red\", \"blue\", \"green\", \"black\" };
string[] array2 = { \"BlUe\", \"yellow\", \"black\" };

I

Answer 1

How about an Enumerable.Intersect and StringComparer combo:

// other options include StringComparer.CurrentCultureIgnoreCase
// or StringComparer.InvariantCultureIgnoreCase
var results = array1.Intersect(array2, StringComparer.OrdinalIgnoreCase);