Problem with modifying List

Moose Pickard

I'm struggling with this loop. It gives me "Collection was modified; enumeration operation may not execute."
I think it is about changing the CarsList. The RentIn method adds the car object to CarsList. So it modifies the list in the foreach loop. If I am correct, how could I use these methods? Since they modify the list on the run. I don't see any other way to do it, without foreach.

foreach (CarRental carRental in CarRentalProgram.CarRentalsList){

   foreach (Car car in carRental.CarsList){

      if(car.Name == "Mercedes"){

      car.Status = CarStatus.Out;

      carRental.RentIn(car, 33, carRental.ID);

      break;

Thank you

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Manikavelu Velayutham16y ago
Accepted answer
This issue is faced by most of the programmers. You are iterating the list in foreach loop, in that case it wont allow that collection to be modified.
There were several ways to fix this issue.
First try this one, hope this alone will fix the issue, if not let me know
replace the code from
foreach (CarRental carRental in CarRentalProgram.CarRentalsList)
to
foreach (CarRental carRental in CarRentalProgram.CarRentalsList.ToList())
0