[c#] Tuples( or arrays ) as Dictionary keys in C#

If your consuming code can make do with an IDictionary<> interface, instead of Dictionary, my instinct would have been to use a SortedDictionary<> with a custom array comparer, ie:

class ArrayComparer<T> : IComparer<IList<T>>
    where T : IComparable<T>
{
    public int Compare(IList<T> x, IList<T> y)
    {
        int compare = 0;
        for (int n = 0; n < x.Count && n < y.Count; ++n)
        {
            compare = x[n].CompareTo(y[n]);
        }
        return compare;
    }
}

And create thus (using int[] just for concrete example's sake):

var dictionary = new SortedDictionary<int[], string>(new ArrayComparer<int>());

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