.NET从HTML页面删除/剥离JavaScript和CSS代码块 [英] .NET Remove/Strip JavaScript and CSS code blocks from HTML page

问题描述

我有带有JavaScript和CSS代码块的HTML字符串：

I have HTML string with the JavaScript and CSS code blocks:

<script type="text/javascript">

  alert('hello world');

</script>

<style type="text/css">
  A:link {text-decoration: none}
  A:visited {text-decoration: none}
  A:active {text-decoration: none}
  A:hover {text-decoration: underline; color: red;}
</style>

如何剥离这些块？
关于可用于删除那些正则表达式的任何建议吗？

How to strip those blocks? Any suggestion about the regular expressions that can be used to remove those?

推荐答案

快速的'n'脏方法将是这样的正则表达式：

The quick 'n' dirty method would be a regex like this:

var regex = new Regex(
   "(\\<script(.+?)\\</script\\>)|(\\<style(.+?)\\</style\\>)", 
   RegexOptions.Singleline | RegexOptions.IgnoreCase
);

string ouput = regex.Replace(input, "");

更好（但可能更慢）的选项是使用 HtmlAgilityPack ：

The better* (but possibly slower) option would be to use HtmlAgilityPack:

HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(htmlInput);

var nodes = doc.DocumentNode.SelectNodes("//script|//style");

foreach (var node in nodes)
    node.ParentNode.RemoveChild(node);

string htmlOutput = doc.DocumentNode.OuterHtml;

*）有关为什么更好的讨论，请参见此线程。

*) For a discussion about why it's better, see this thread.

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