Necrons/Dark Eldar

Would this even make sense? Would Dark Eldar having pretty much no connection to the warp make it a little easier for Necrons to not hate them? Would they ever have common objectives? How would say an Archon and a Necron Lord interact? Would they see a common enemy in Chaos/Slaanesh and band together for those reasons? Or would it just be a giant evil space elf/robot zombie bloodbath?

Necrons are one of the few armies we can't ally with sooo.... not sure what your question is. Fluff wise Eldar (of all types) have been sworn enemies of the necrons since the War in Heaven (long before the birth of Slaanesh and The Fall).

Really a shame too as Imotehk would be an awesome though expensive ally. Night fighting fit multiple rounds with lightning striking your enemies and your army being able to see in the dark ... Fun stuff

Fluff wise NO, game wise NO. Were mortal foes for all time.

We should be out crushing the Necrons wherever they be found or stand in our way, not becoming friends with them!