public int this[int x, int y]
{
get { return (x + y); }
}
public int this[int x, int y] { get { return (x + y); }
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It’s an indexer that accepts two integers. You can think of it as similar to a two dimensional array, except that the result is calculated on the fly instead of being stored.
It allows you to write
int result = foo[a, b];