c# - How to use HashSet<string>.Contains() method in case -insensitive mode?

Question

How to use HashSet<string>.Contains() method in case -insensitive mode?

Answer 1

You can create the HashSet with a custom comparer:

HashSet<string> hs = new HashSet<string>(StringComparer.OrdinalIgnoreCase);

hs.Add("Hello");

Console.WriteLine(hs.Contains("HeLLo"));