C＃：最好的方式注入到CSS MSHTML实例？ [英] C#: Best way to inject CSS into MSHTML instance?
问题描述
我试图注入一些CSS伴随一些其他HTML到C＃托管WebBrowser控件。我试图通过底层MSHTML（的DomDocument属性）控制要做到这一点，因为这code是作为一个完整的IE8 BHO的原型不爽。
I'm trying to inject some CSS that accompanies some other HTML into a C# managed WebBrowser control. I am trying to do this via the underlying MSHTML (DomDocument property) control, as this code is serving as a prototype of sorts for a full IE8 BHO.
问题是，虽然我可以注入HTML（通过mydomdocument.body.insertAdjacentHTML）和Javascript（通过mydomdocument.parentWindow.execScript），它是平了拒绝我的CSS code。
The problem is, while I can inject HTML (via mydomdocument.body.insertAdjacentHTML) and Javascript (via mydomdocument.parentWindow.execScript), it is flat-out rejecting my CSS code.
如果我比较包含我想与注射后目标网页的源文件中插入HTML中的字符串时，MSHTML的源将字面上包含一切的除了的为＆LT;风格＆GT; 元素及其底层源。
If I compare the string containing the HTML I want to insert with the destination page source after injection, the MSHTML's source will literally contain everything except for the <style> element and its underlying source.
CSS的通行证CSS 2.1 W3C验证。它不会做任何事太棘手，除了一些背景图像属性具有图像直接嵌入到CSS（如背景图像：网址（数据：图像/ PNG; BASE64 ...），并注释掉这些行不会改变结果。
The CSS passes W3C validation for CSS 2.1. It doesn't do anything too tricky, with the exception that some background-image properties have the image directly embedded into the CSS (e.g. background-image: url("data:image/png;base64 ...), and commenting out those lines doesn't change the result.
更多奇怪的（而且我不知道这是否是相关的），是，我是有这个上周没有问题。这周我回来给它，开关周围的一些code，它实际注射前处理待注入HTML后，它不再奏效。当然，我认为我的一个变化，都可能是问题，但评论出所有的逻辑和喂养它直串的HTML仍然出现未格式化。在
More strangely (and I am not sure if this is relevant), was that I was having no problems with this last week. I came back to it this week and, after switching around some of the code that handles the to-be-injected HTML before actual injection, it no longer worked. Naturally I thought that one of my changes might somehow be the problem, but after commenting all that logic out and feeding it a straight string the HTML is still appearing unformatted.
在我注入＆LT的那一刻，身体GT; 标签，虽然我已经试图注入＆LT; HEAD＆GT; 而这会见了类似的结果。
At the moment I'm injecting into the <body> tag, though I've attempted to inject into <head> and that's met with similar results.
在此先感谢您的帮助！
汤姆
推荐答案
弄成解决自己：
mshtml.HTMLDocument test = (mshtml.HTMLDocument)webBrowser1.Document.DomDocument;
//inject CSS
if (test.styleSheets.length < 31) { // createStyleSheet throws "Invalid Argument if >31 stylesheets on page
mshtml.IHTMLStyleSheet css = (mshtml.IHTMLStyleSheet)test.createStyleSheet("", 0);
css.cssText = myDataClass.returnInjectionCSS(); // String containing CSS to inject into the page
// CSS should now affect page
} else {
System.Console.WriteLine("Could not inject CSS due to styleSheets.length > 31");
return;
}我没想到的是，createStyleSheet创建的指针仍然是在文档的DOM'活'......因此，你不需要你创建的样式表追加回到其父。我最终通过研究动态CSS code为JavaScript作为实现是pretty很多相同搞清楚了这一点。
What I didn't realize is that createStyleSheet creates a pointer that is still 'live' in the document's DOM... therefore you don't need to append your created stylesheet back to its parent. I ended up figuring this out by studying dynamic CSS code for Javascript as the implementations are pretty much identical.
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