❔ why is .ToList() considered being in a right answer for this problem?
Stack Overflow
Collection was modified; enumeration operation may not execute
I can't get to the bottom of this error, because when the debugger is attached, it does not seem to occur.
Collection was modified; enumeration operation may not execute
Below is the code.
This i...
11 Replies
You linked an answer which says ToList isn't the right answer?
The most-voted answer also explained why
yeah ToList would be a copy of the object for that thread
but that's not a great solution because it could lead to a lot of copies and a lot of memory
maybe a concurrent dictionary would be better
or a lock
or a soft delete
it depends
the immutable thing could also be good, a more formal approach
Sorry i meant the answer with green check
By tolist isnt thread safe or is it?
The other thread could change the list while tolist is executing on other thread
It just doesnt feel right that people would just go with that answer or maybe there is something that i am missing
you can look at the source of ToList() by F12 it
answer is 99% it's not therad safe
i see what u mean
ig you'd have to make it Immutable
https://stackoverflow.com/a/57799537 okay this answer then
Stack Overflow
Collection was modified; enumeration operation may not execute
I can't get to the bottom of this error, because when the debugger is attached, it does not seem to occur.
Collection was modified; enumeration operation may not execute
Below is the code.
This i...
but you can still call both methods at the same time which mean u you can access the 'subscribers' twice at the same time. Once when you are replacing it with new collection and second time when I guess foreach is getting reference to it?
making the object immutable means that you can't write it so there could not be a shared writing error
but yeah still all the other parts are not protected for thread-safeness
Was this issue resolved? If so, run
/close - otherwise I will mark this as stale and this post will be archived until there is new activity.