等效于单线程单元。
COM 线程模型可设置为单线程单元或多线程单元。
The COM threading model can be set to single-threaded apartment or multithreaded apartment.
原因很可能是单线程单元 (STA) 线程不发送消息。
The most probable cause is that a single-threaded apartment (STA) thread is not pumping messages.
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