why class's this is readonly? [closed]

Question

I tried to define a class. when I assign using

this = blah blah

the compiler reports "this is readonly"

when I change the class to struct, it looks fine, any idea?

Answer 1

this in a class refers to the reference; you cannot reassign your own reference, but you can assign fields etc of the current instance.

this in a struct refers to the value itself; when you assign this, just like when you assign to any value-type variable / parameter, it is copying all of the fields over the top (as a memory-copy). That is possible, but is frankly rare to see in the wild. Or, as with classes, you can assign each of the fields separately.