问题
I want to use MSHTML [1] to access DOM in IE, but I have just found out that it lacks querySelector and querySelectorAll methods in HTML document classes, which will otherwise be very helpful to obtain elements within a document by CSS selectors.
The only workaround I can think of for now is to do everything by executing a script, but it is awful.
Is there any MSHTML version that has the two methods (querySelector and querySelectorAll)? Is there any other libraries (hopefully, official .Net libraries by Microsoft) where the two methods or their equivalents are available?
[1] %ProgramFiles(x86)%\Microsoft.NET\Primary Interop Assemblies\Microsoft.mshtml.dll
回答1:
The querySelector() method and friends are alive and well in MSHtml and the IE DOM, the problem is that the PIA that most programmers have on their machine is heavily outdated. The one registered in the GAC on my machine carries a 7.0.3300.0 version number, that dates back to 2002.
There is a workaround for that, you can generate your own interop library and avoid the one in the GAC. The trick is to intentionally generate a mismatch by creating an interop assembly without a strong name so it cannot match the one in the GAC. Be sure to do this only on VS2010 or later, you want to take advantage of the Embed Interop Types feature.
Start the Visual Studio Command Prompt and navigate to your project directory. And execute this command:
Tlbimp c:\windows\system32\mshtml.tlb
It will trundle for a while, the type library is big, and spit out several icky looking warnings that you can ignore. Go back to VS, remove the existing MSHTML reference and use Add Reference, Browse tab. Pick the MSHTML.dll file that was generated by Tlbimp.
I cannot guarantee having no problems at all, you do need to keep in mind that your user needs to have an up-to-date version of IE, preferably one that matches yours. If you use a method on an interface that an older version of IE doesn't have then it will fail pretty nastily, an AccessViolationException is likely.
回答2:
Yesterday I notice the same problem, I found a solution.
The Next example code works for me:
Document.querySelectorAll("#navbar_search>a").item(0).click();
If i try to do "the same", but with this code, it fails:
HTMLDocument doc;
doc = ie.Document;
doc.querySelectorAll("#navbar_search>a").item(0).click();
I'm not a COM expert but I thing the first solution is a late binding (dependences are resolved at run-time), while the second solution is a compliler-time binding and it depends on a 'good' predefined libary and that's not the case with mshtml.
来源：https://stackoverflow.com/questions/21166818/why-doesnt-mshtml-for-net-have-queryselector-and-queryselectorall-or-where-ar