Foreach --- the set has been modified; enumeration may not be performed ., Foreach --- Enumeration

Foreach --- the set has been modified; enumeration may not be performed ., Foreach --- Enumeration

Summary:

Foreach is read-only, and the data cannot be changed (including modification, deletion, and addition) when the data is retrieved ). To avoid this problem, we should use the for loop ---

 

Cause:

When you use foreach to traverse a Collection, this error occurs if you Add or Remove the Collection or assign a value to an item attribute.
Because the IEnumerator returned by the Collection exposes the current attribute as a read-only attribute, modifications to it may cause runtime errors. You only need to change foreach to for traversal.


--- Egg