blocks|key|361433|text|这样做的目的是确保通过指定COINIT_APARTMENTTHREADED作为参数来调用CoInitialize。如果不使用任何COM组件或ActiveX控件，则对您没有任何影响。如果你这样做了，那么它就变得很关键了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|361434|单元线程的控件实际上是单线程的，对它们的调用只能在创建它们的单元中处理。|361435|来自MSDN的更多细节：|361436|在单线程单元中创建的|361437|对象仅从其单元的线程接收方法调用，因此调用是序列化的，并且仅到达消息队列边界(当调用Win32函数PeekMessage或SendMessage时)。|blockquote|361438|361439|在多线程单元(MTA)中的COM线程上创建的对象必须能够随时接收来自其他线程的方法调用。通常使用Win32同步原语(如临界区、信号量或互斥锁)在多线程对象的代码中实现某种形式的并发控制，以帮助保护对象的数据。|361440|当STA或MTA中的线程调用配置为在中立线程单元(+NTA+)中运行的对象时，该线程将转移到NTA。如果此线程随后调用CoInitializeEx，则调用将失败并返回RPC_E_CHANGED_MODE.|361441|entityMap^0|18|C|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|10|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|11|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|13|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|14|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|U|$]]

What that does it it ensures that <code>CoInitialize</code> is called specifying COINIT_APARTMENTTHREADED as the parameter. If you do not use any COM components or ActiveX controls it will have no effect on you at all. If you do then it's kind of crucial.

Controls that are apartment threaded are effectively single threaded, calls made to them can only be processed in the apartment that they were created in.

Some more detail from MSDN:

<blockquote>
 Objects created in a single-threaded
 apartment (STA) receive method calls
 only from their apartment's thread, so
 calls are serialized and arrive only
 at message-queue boundaries (when the
 Win32 function PeekMessage or
 SendMessage is called).
 
 Objects created on a COM thread in a
 multithread apartment (MTA) must be
 able to receive method calls from
 other threads at any time. You would
 typically implement some form of
 concurrency control in a multithreaded
 object's code using Win32
 synchronization primitives such as
 critical sections, semaphores, or
 mutexes to help protect the object's
 data. 
 
 When an object that is configured to
 run in the neutral threaded apartment
 (NTA) is called by a thread that is in
 either an STA or the MTA, that thread
 transfers to the NTA. If this thread
 subsequently calls CoInitializeEx, the
 call fails and returns
 RPC_E_CHANGED_MODE.
</blockquote>

blocks|key|360131|text|单元线程是一个COM概念；如果您没有使用COM，并且您调用的API都没有“在幕后”使用COM，那么您就不需要担心单元。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360132|如果您确实需要注意公寓，那么细节可能会变得有点复杂(http://msdn.microsoft.com/en-us/library/ms693344(VS.85%2529.aspx)；一个可能过于简单的版本是，标记为STA的COM对象必须在STAThread上运行，而标记为MTA的COM对象必须在MTA线程上运行。使用这些规则，COM可以优化这些不同对象之间的调用，从而避免在不必要的情况下进行封送处理。|offset|length|360133|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms693344(VS.85%2529.aspx)^0|0|Q|1R|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Apartment threading is a COM concept; if you're not using COM, and none of the APIs you call use COM "under the covers", then you don't need to worry about apartments.

If you do need to be aware of apartments, then the details can get <a href="http://msdn.microsoft.com/en-us/library/ms693344(VS.85).aspx" rel="noreferrer">a little complicated</a>; a probably-oversimplified version is that COM objects tagged as STA must be run on an STAThread, and COM objects marked MTA must be run on an MTA thread. Using these rules, COM can optimize calls between these different objects, avoiding marshaling where it isn't necessary.

blocks|key|3364707|text|STAThread是在C#图形用户界面项目的主函数之前编写的。它什么也不做，只是允许程序创建单个线程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3364708|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

STAThread is written before the Main function of a C# GUI Project. It does nothing but allows the program to create a single thread.

From the MSDN article on STAThread:

<blockquote>
 Indicates that the COM threading model for an application is single-threaded apartment (STA).
</blockquote>

(For reference, that's <a href="http://msdn.microsoft.com/en-us/library/system.stathreadattribute.aspx" rel="noreferrer">the entire article</a>.)

Single-threaded apartment... OK, that went over my head. Also, I read somewhere that unless your application uses COM interop, this attribute actually does nothing at all. So what exactly does it do, and how does it affect multithreaded applications? Should multithreaded applications (which includes anything from anyone using <code>Timer</code>s to asynchronous method calls, not just threadpools and the like) use MTAThread, even if it's 'just to be safe'? What does STAThread and MTAThread actually do?

STAThread and multithreading

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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来自STAThread上的MSDN文章：指示应用程序的COM线程模型是单线程单元(STA)。(作为参考，请参阅。)单线公寓。好吧，我没想到这一点。此外，我在某处读到，除非您的应用程序使用COM互操作，否则该属性实际上什么也不做。那么它到底做了什么，又是如何影响多线程应用程序的呢？多线程应用程序(包括任何使用Timer的...

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