C＃ - 如何在运行时测试COM coclass用于实例化接口？ [英] C# - How to test at runtime which COM coclass was used to instantiate an interface?
问题描述
假设您有一个COM接口 ICOMInterface ，由coclasses实现 Coclass1 和 Coclass2 。这些coclass没有自己的接口（为了简单起见，并说明我的问题）。
Suppose you have a COM interface ICOMInterface that is implemented by coclasses Coclass1 and Coclass2. Neither of these coclasses have interfaces of their own (for simplicity's sake and to illustrate my issue).
在C＃中，你可以创建一个COM接口的实例从coclass像这样：
In C#, you can create an instance of a COM interface from a coclass like so:
ICOMInterface myComInterface = new Coclass1();
现在，如何确定 myComInterface 实例化 Coclass1 或 Coclass2 ？
Now, how can you determine whether myComInterface was instantiated by Coclass1 or Coclass2?
is语句如下总是返回true，因此对此目的无效。
Using the "is" statement like follows always returns true, and as such is useless for this purpose.
Debug.WriteLine(myComInterface is Coclass1) // writes "True"
Debug.WriteLine(myComInterface is Coclass2) // writes "True"
$ b b
这将工作，如果我是测试接口，而不是coclasses，但这些coclass没有除他们两者实现的接口， ICOMInterface 。
我希望有一个简单的答案，这个相当一般的情况下，我忽略，否则我可以发布更多的具体细节，如果需要。
I am hoping that there is a simple answer to this rather generic scenario that I am overlooking, otherwise I can post more specific details if required.
感谢您的帮助！
推荐答案
如果COM对象实现 IPersist 界面，您可以通过 IPersist获取其CLSID :: GetClassID（）方法。这可能是所有你需要知道你正在使用的类。您还可以通过WinAPI ProgIDFromCLSID（）方法获取人类可读的ProgID。
If the COM object implements the IPersist interface, you can get its CLSID through the IPersist::GetClassID() method. This may be all you need to know what class you're working with. You can also get the human-readable ProgID through the WinAPI ProgIDFromCLSID() method.
href =http://stackoverflow.com/questions/1253368/c-get-progid-from-com-object> C＃从COM对象获取progID
See here: C# Get progID from COM object
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