为什么IHTMLDocument2不等于IHTMLDocument2.body.document？

Question

下面的doc2和doc22有什么不同？

IHTMLDocument2 doc2 = (pDisp as IWebBrowser2).Document as IHTMLDocument2;
IHTMLDocument2 doc22 = doc2.body.document as IHTMLDocument2;
bool isequal = Marshal.GetIUnknownForObject(doc2) == Marshal.GetIUnknownForObject(doc22);
//Here, isequal is false. Why?

Answer 1

对我来说，最可能的解释是，不同的包装器对象是为相同的东西创建的。谁知道MSHTML是如何在内部管理它的。只要((pDisp as IWebBrowser2).Document as IHTMLDocument3).documentElement as IUnknown == (((pDisp as IWebBrowser2).Document as IHTMLDocument2).body.document as IHTMLDocument3).documentElement as IUnknown世界是井然有序的;)