今天在使用foreach循環遍歷list集合時，出現Collection was modified; enumeration operation may not execute.這個錯誤，查了半天才發現是當想要修改list集合時，不能使用foreach，因為foreach是取只讀的，在取的時候數據不能變（包括修改，刪除，添加等），所以只能用for循環。
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