为什么 IHTMLDocument2 不等于 IHTMLDocument2.body.document？
为什么下面的 doc2 与 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?
Why is the following doc2 different from doc22?
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?
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对我来说，最可能的解释是为同一事物创建不同的包装对象。谁知道 MSHTML 内部是如何管理这个的。只要
((pDisp as IWebBrowser2).Document as IHTMLDocument3).documentElement as IUnknown == (((pDisp as IWebBrowser2).Document as IHTMLDocument2).body.document as IHTMLDocument3).documentElement as IUnknown世界秩序井然；）For me the most likely explanation is that different wrapper objects are created for the same thing. Who knows how MSHTML manages this internally. As long as
((pDisp as IWebBrowser2).Document as IHTMLDocument3).documentElement as IUnknown == (((pDisp as IWebBrowser2).Document as IHTMLDocument2).body.document as IHTMLDocument3).documentElement as IUnknownthe world is in order ;)