问题描述
我正在尝试从 ArrayList 中删除一个项目,但我得到了这个异常:
集合被修改;枚举操作可能无法执行.
I'm trying to remove an item from an ArrayList and I get this Exception:
Collection was modified; enumeration operation may not execute.
有什么想法吗?
推荐答案
您在 foreach 期间删除了项目,是吗?简单地说,你不能.这里有一些常见的选项:
You are removing the item during a foreach, yes? Simply, you can't. There are a few common options here:
- 将 List<T> 和 RemoveAll 与谓词一起使用
按索引向后迭代,删除匹配项
- use List<T> and RemoveAll with a predicate
iterate backwards by index, removing matching items
for(int i = list.Count - 1; i >= 0; i--) { if({some test}) list.RemoveAt(i); }
使用foreach,并将匹配项放入第二个列表;现在枚举第二个列表并从第一个列表中删除这些项目(如果你明白我的意思)
use foreach, and put matching items into a second list; now enumerate the second list and remove those items from the first (if you see what I mean)