Is this cheeting? (234x improvement)

[dazinator]

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[dazinator]

@StefanTheCode - Thanks for the challenge!
Perhaps I am the first to use FromSqlRaw? This seems to be a recommended approach when EF just isn't capable of cutting the mustard. My whole approach here is about minimizing EF involvement whilst still using approved api's. In that sprit I am also not using LINQ (just a couple of for loops) over a flattened result set which builds and returns the result dto's in one single iteration of the data / rows from the db.

Interestingly I only see an approx 229.75x faster improvement. Memory usage is drastically better - and could be made better by modying the dto's returned to remove redundant fields no doubt, but I wasn't sure if this was allowed. I also have a few other ideas but given speed is the goal and not memory usage I won't pursue them.

I believe I have adhered to the rules in that I have treated the DbContext and entities as unmodifiable / third party code. I have derived my own dbcontext in order to extend the model to include a keyless entity which is - I feel a valid technique, as it is purely additive and makes no changes to the original models or schema, so assuming the original dbcontext and entities were shipped to me in a non modifiable assembly, this is a valid approach!

[dazinator]

Ran it again and it says 234 times improvement!

[dazinator]

Assuming it is ok to trim the dto's returned I can make it a tiny bit faster (237x vs 234x) - have just pushed that commit.