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There is no guarantee that a client implementing IGrid<T> does actually use an 2D array T[,] for the implementation. So IMHO you have the following options:

• change (or extend) the interface of your Transformation class to use IGrid<T> instead of T[,]

• extend IGrid<T> to provide access to underlying T[,], with the drawback of loosing immutability (which forces any client to use a T[,] internally)