.net - COM Interop - COM Callable Wrapper 中的多线程

Question

是否可以在 .NET COM 可调用包装器 DLL 程序集中使用多线程？

例如，我有一个 .NET 程序集 dll，它向 COM 公开一个 .NET FTP 库。上传功能目前被编程为“尽力而为”功能。我没有使用事件或返回值来显示上传或下载是否成功完成，如有必要，我可能会考虑稍后实现。 .NET 程序集(以我非常有限的理解)是否可以简单地将这些上传和下载过程转移到另一个线程？假设这是可能的，如果在上传或下载全部完成之前关闭托管应用程序，这会产生什么结果？

Answer 1

是的，MSDN 文章 Managed and Unmanaged Threading解释细节。特别是:

For interoperability, the common language runtime creates and initializes an apartment when calling a COM object. A managed thread can create and enter a single-threaded apartment (STA) that contains only one thread, or a multi-threaded apartment (MTA) that contains one or more threads. When a COM apartment and a thread-generated apartment are compatible, COM allows the calling thread to make calls directly to the COM object. If the apartments are incompatible, COM creates a compatible apartment and marshals all calls through a proxy in the new apartment.

what would be the result of this if the hosting application was closed before the uploads or downloads were all completed?

好问题。你如何终止应用程序？如果它只是您要关闭的 GUI 应用程序，我认为只要这些线程处于事件状态，底层进程就会继续执行。我建议您创建一个测试项目来确认您的应用程序的行为。