爲什麼IHTMLDocument2不等於IHTMLDocument2.body.document？

Question

爲什麼以下doc2與doc22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

對我來說，最可能的解釋是，不同的包裝對象是爲同一件事情創建的。誰知道MSHTML如何在內部管理它。只要((pDisp as IWebBrowser2).Document as IHTMLDocument3).documentElement as IUnknown == (((pDisp as IWebBrowser2).Document as IHTMLDocument2).body.document as IHTMLDocument3).documentElement as IUnknown世界在秩序;）