Question

Here is some dummy code that illustrates what I want to do:

List<int> list1 = new List<int>();
//Code to fill the list
foreach(int number in list1)
{
    if(number%5==0)
    {
        list1.Remove(number);
    }
}

Assuming the test actually removes an int, it will throw an error. Is there a way of doing this in a foreach, or do I have to convert it to a for loop?

Answer 1

You can’t remove items from a collection that you are iterating thru with a for each.
I would do this…

list1 = list1.Where(l => l % 5 != 0).ToList();