Get value in case-insensitive HashSet <string>

Question

I am case insensitive HashSet<string>:

private HashSet<string> a = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase);

I am curious if I can now extract the string in the actual case. Pseudocode of what I need:

return a.Contains(word) ? a[word] : null;

(just pseudo code, it will not work)

For example, I have the string " TestXxX " in a HashSet. I need a code that receives "testxxx" (or "tEsTXXx") as input and returns " TestXxX ".

My current workaround is to use Dictionary<string,string>instead and put the same value for the key and value. This is obviously not elegant and consumes 2x of memory as required.

Answer 1

KeyedCollection

public class Keyed : KeyedCollection<string, string>
{
    public Keyed(IEqualityComparer<string> comparer) : base(comparer)
    {

    }

    protected override string GetKeyForItem(string item)
    {
        return item;
    }
}

:

var keyed = new Keyed(StringComparer.InvariantCultureIgnoreCase);
keyed.Add("TestXxX");

Console.WriteLine(keyed["tEsTXXx"]);

Answer 2

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