Multidimensional arrays do not implement IEnumerable, or do they?

Question

For the reasons that I still do not understand (see this SO question) multidimensional arrays in CLR do not implement IEnumerable. So the following doe

Answer 1

There are two reasons they don't implement it natively in C#:

• There's more than one way you could do it. Do you want each 'cell', or do you want each 'row'? And how do you define 'row': [], IEnumerable, other? What if there are more than two dimensions? As soon as they pick one way, an army of developers will tell them they should have done it a different way.
• Thanks to iterator blocks and the yield keyword, it just so easy to implement your own that's specific to your need at the time. Of course, that's a C# construct, but it's not that much harder in VB.