How to make IEnumerable.Contains case-insensitive?

Question

Suppose I have a .net Array of strings.

string[] strings = new string[] { \"AbC\", \"123\", \"Xyz\", \"321\" };

If I wanted to see if the a

Answer 1

I personally like this guy's LambdaComparer, which is really useful for stuff like this:

LINQ Your Collections with IEqualityComparer and Lambda Expressions

Example Usage:

var comparer = new LambdaComparer(
    (lhs, rhs) => lhs.Equals(rhs, StringComparison.InvariantCultureIgnoreCase));

var seq = new[]{"a","b","c","d","e"};

Debug.Assert(seq.Contains("A", comparer));