Why would one ever use the “in” parameter modifier in C#?

Question

So, I (think I) understand what the in parameter modifier does. But what it does appears to be quite redundant.

Usually, I\'d think tha

Answer 1

in it is readonly reference in c# 7.2

this means you do not pass entire object to function stack similar to ref case you pass only reference to structure

but attempt to change value of object gives compiler error.

And yes this will allow you to optimize code performance if you use big structures.