您肯定要执行或者通过的锁定或通过如ReaderWriterLockSlim.

You definitely have to implement thread-safe access either via lock or via e.g. ReaderWriterLockSlim.

变量本身（名单＆LT;>）是线程安全的，如果你不是第一次分配后修改它（通过新的），但元素访问必须是线程安全的（因为你说你添加/删除从列表中的元素，因此改变其状态）

Variable itself (List<>) is thread-safe if you not modifies it after first allocation (via new) but element access have to be thread-safe (since you say you adding/removing elements from list hence changing its state)

顺便说一句，如果线程修改了自己的项目，你为什么要分享？所以，你已经实现了？为什么组织这样？也许，如果你表现出的细节有更好的提醒。

BTW, if threads modifies its own items why you want to share them? So what you have implemented? Why you organize this way? Maybe there are better advise if you show details.