修改错误的集合

Question

I always get the collection was modified error when adding elements to List<> while it is being used in for i or foreach loops and it makes cross threading a little bit complicated. Is there a special class I'm missing that will not make the enumerator invalid if the collection is modified?

Answer 1

If you are trying to add or remove items from the collection you are looping from then you will receive a InvalidOperationException .

To avoid that you need to either create and iterate over a copy of the array/list you are currently iterating from or create a temporary list to host the changes you are making then use that one to update your original source.

Answer 2

就从集合中删除（删除）项目而言，您还可以向后遍历集合的副本并根据需要删除项目，这不会造成麻烦，因为这不会对剩余项目的索引产生负面影响被迭代。