Solved: Why Linq Where.FirstOrDefault is faster than use FirstOrDefault with condition on an array?

Hi all.


Why applying “.Where(condition).FirstOrDefault()” is much faster than “.FirstOrDefault(condition) when it’s applied on an array?


Answer: While calling method Where() on an Array or a List, it’s optimized to use the enumerator of the source directly. But FirstOrDefault(), which doesn’t have this mechanism, runs the virtual method version from IEnumerator.GetEnumerator().

Special thanks to Iris Sakura.

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