I tried to look at the implementation of Array.Copy in C# with ILSpy but

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Editorial Team

Asked: May 23, 20262026-05-23T11:24:31+00:00 2026-05-23T11:24:31+00:00

I tried to look at the implementation of Array.Copy in C# with ILSpy but it didn’t show me the implementation itself.

I wrote a simple benchmark, Array.Copy vs a simple for loop to copy the data.
Array.Copy was faster.

How is it implemented faster?

Thanks,
Shay

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Editorial Team · Answer 1 · 2026-05-23T11:24:31+00:00

Editorial Team

Same techniques used to write a fast memcpy function:

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