C# LINQ Performance Tips #5 - Skip & .NET Runtimes 

That's perfectly valid implementation. The last example was just me having fun and de-virtualizing everything :) The performance was something else though. That gives me an idea to construct a version of de-virt linq having one global Enumerable struct will all of the needed information and construct our LINQ contract on that.

@@LevelUppp Hyperlinq is fully devirtualized but I'd love to see our take on that.

@ de-virtualized as not going through the VTABLE or VSD. Using only concrete implementations and not interfaces.

@@LevelUppp Hyperlinq uses constrained interfaces (adds IL opcode constrained) so, although you see them on the code, the calls are not virtual.

@ Ahh right so you say notnull when you want to enforce struct?

No EF is a different technology so Im not sure what are the differences.