消息筛选器对特定线程是唯一的。

Message filters are unique to a specific thread.

youdao

消息筛选类，用于在消息流中根据消息的内容对其进行路由。

Filtering message class — for routing within a message flow based on the contents of a message.

youdao

但是，也可以将后台线程作为STA创建，然后为该线程注册消息筛选器以处理此情况。

However, you can also create the background thread as STA and then register a message filter for that thread to handle this case.

youdao