When should you use C# indexers?

Question

I\'d like to use indexers more, but I\'m not sure when to use them. All I\'ve found online are examples that use classes like MyClass and IndexerClass

Answer 1

I remember there was this time when I had a long inside a class, and some digits of that particular long meant something (for example if the third digit was a 3 it meant that the chart had a specific type of encoding, horrible system I know but I didn't invent it)

So I did something like this to return the xth digit of the number:

protected int this[int index]
{
    get
    {
        int tempN = Number;
        if (index > 0)
        {
            tempN /= index * 10;
        }
        return tempN % 10;
    }
}

It was protected because a different method used it, so it was kind of a helper. Of course a simple GetDigit(int a) would've been the same thing (and more self-explanatory) but at the time I thought it was one of the few times I thought using an indexer would make sense. Haven't used them since =(.