我正在尝试删除包含特定文本字符串的所有html元素(标记)。我有2376个html文档,都有不同的doctype标准。有些甚至没有doctype(可能与此问题无关)。
所以,我正在寻找一个文字字符串,上面写着“如何引用这篇论文”,我发现它被包含在<p>-tag
,<h4>-tag
或{{1 }}
<legend>-tag
通常看起来像这样,
<p>-tag
<p style="text-align : center; color : Red; font-weight : bold;">How to cite this paper:</i></p>
通常看起来像这样,
<h4>-tag
<h4>How to cite this paper:</h4>Antunes, P., Costa, C.J. & Pino, J.A. (2006).
看起来像这样,
<legend>-tag
手头的任务是找到这些标记并从文件中删除它们,然后再次保存文件。我确实需要删除更多标记,但需要一些帮助来理解HAP和XPath,以及如何根据其值或其他唯一数据定位特定标记。
到目前为止,我已经在C#中提出了这个代码,它是一个控制台应用程序。 这是我的主要(对不好的缩进),
<legend style="color: white; background-color: maroon; font-size: medium; padding: .1ex .5ex; border-right: 1px solid navy; border-bottom: 1px solid navy; font-weight: bold;">How to cite this paper</legend>
这是查看文件目录的私有方法,
//Variables
string Ext = "*.html";
string folder = @"D:\websites\dev.openjournal.tld\public\arkivet\";
IEnumerable<string> files = GetHTMLFiles(folder, Ext);
List<string> cite_files = new List<string>();
var doc = new HtmlDocument();
//Loop to match all html-elements to query
foreach (var file in files)
{
try
{
doc.Load(file);
cite_files.Add(doc.DocumentNode.SelectNodes("//h4[contains(., 'How to cite this paper')]").ToString());
cite_files.Add(doc.DocumentNode.SelectNodes("//p[contains(., 'How to cite this paper')]").ToString());
}
catch (Exception Ex)
{
Console.WriteLine(Ex.Message);
}
}
//Counts numbers of hits and prints data to user
int filecount = files.Count();
int citations = cite_files.Count();
Console.WriteLine("Number of files scanned: " + filecount);
Console.WriteLine("Number of citations: {0}", citations);
// Program end
Console.WriteLine("Press any key to close program....");
Console.ReadKey();
独特的东西似乎是“如何引用本文”,所以我试图找到包含这些确切单词的所有特定标签,然后将其删除。我的记事本显示应该有1094个文件与这个短语,所以我试图让他们全部。 :)
任何帮助非常感谢! :)
答案 0 :(得分:1)
Html Agility Pack支持LINQ选择器,在这种情况下非常方便。给出一些基于上面例子的HTML:
var html =
@"<html><head></head><body>
<!-- selector match: delete these nodes -->
<p style='text-align: center; color: Red; font-weight: bold;'>How to cite this paper:</i></p>
<h4> How to cite this paper:</h4> Antunes, P., Costa, C.J. & amp; Pino, J.A. (2006).
<legend style='color: white; background-color: maroon; font-size: medium; padding: .1ex .5ex; border-right: 1px solid navy; border-bottom: 1px solid navy; font-weight: bold;'>How to cite this paper </legend>
<div><p><i><b>How to cite this paper (NESTED)</b></i></p></div>
<!-- no match: keep these nodes -->
<p>DO NOT DELETE - How to cite</p>
<h4>DO NOT DELETE - cite this paper:</h4>
<legend>DO NOT DELETE</legend>
</body></html>";
您可以创建应搜索的标记集合,选择匹配的节点,然后将其删除,如下所示:
var tagsToDelete = new string[] { "p", "h4", "legend" };
var nodesToDelete = new List<HtmlNode>();
var document = new HtmlDocument();
document.LoadHtml(html);
foreach (var tag in tagsToDelete)
{
nodesToDelete.AddRange(
from searchText in document.DocumentNode.Descendants(tag)
where searchText.InnerText.Contains("How to cite this paper")
select searchText
);
}
foreach (var node in nodesToDelete) node.Remove();
document.Save(OUTPUT);
具有以下结果:
<html><head></head><body>
<!-- XPath match: delete these nodes -->
Antunes, P., Costa, C.J. & amp; Pino, J.A. (2006).
<div></div>
<!-- no match, keep these nodes -->
<p>DO NOT DELETE - How to cite</p>
<h4>DO NOT DELETE - cite this paper:</h4>
<legend>DO NOT DELETE</legend>
</body></html>