What is the purpose of Array.GetLowerBound(int)?

Question

I don\'t understand the purpose of Array.GetLowerBound().

Does it ever return non-zero? When? How?

Thanks.

Answer 1

There is one CreateInstance call that sets non-zero lower bounds:

CreateInstance(Type, Int32[], Int32[])
Creates a multidimensional Array of the specified Type and dimension lengths, with the specified lower bounds.

Compare this to:

CreateInstance(Type, Int32[])
Creates a multidimensional Array of the specified Type and dimension lengths, with zero-based indexing. The dimension lengths are specified in an array of 32-bit integers.

(Or to any of the other overloads, in fact. Of the six CreateInstance overloads, five create a zero-based array.)