【问题】
C#中，想要去除html的标签tag，且同时去除注释comment。
【解决过程】
1.参考：
How can I strip HTML tags from a string in ASP.NET?
去试试用：
public string htmlRemoveTag(string html)
{
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.LoadHtml(html);
if (htmlDoc == null)
{
return "";
}
string filteredHtml = "";
foreach (var node in htmlDoc.DocumentNode.ChildNodes)
{
filteredHtml += node.InnerText;
}
return filteredHtml;
}结果是，可以去除所有的tag了。
但是对于html的注释：
| <!——- A+ Content Begins Here ——-> <!——- BRAND LOGO ——-> <!——- TITLE ——-> Frigidaire Mini Air Conditioner <!——- GENERAL DESCRIPTION ——-> Frigidaire’s FRA052XT7 5,000 BTU 115-Volt Window-Mounted Mini-Compact Air Conditioner is perfect for rooms up to 150 square feet. It quickly cools a room on hot days and quie。。。。。。。。 |
却没去掉。
2.继续去除comment。
参考：
然后用：
public string htmlRemoveTag(string html)
{
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.LoadHtml(html);
if (htmlDoc == null)
{
return "";
}
// 1. remove all comments
//(1)get all comment nodes using XPATH
foreach (HtmlNode comment in htmlDoc.DocumentNode.SelectNodes("//comment()"))
{
//(2) remove comment node itself
comment.ParentNode.RemoveChild(comment);
}
//2. get all content
string filteredHtml = "";
foreach (var node in htmlDoc.DocumentNode.ChildNodes)
{
filteredHtml += node.InnerText;
}
return filteredHtml;
}
就实现了目的，结果是html的内容，没有tag，没有comment：
| ” Frigidaire Mini Air Conditioner Frigidaire’s FRA052XT7 5,000 BTU 115-Volt Window-Mounted Mini-Compact Air Conditioner is perfect for rooms up to 150 square feet. It quickly cools a room on hot days and quiet operation keeps you cool without keeping you awake. This unit features mechanical rotary controls and top, full-width, 2-way air direction control. The antimicrobial mesh filter with side, slide-out access cleans the air removing harmful bacteria. Low voltage start-up conserves energy and saves you money 。。。。。。。。。。。。。。 |
【总结】
想要去除html的tag，并且不保留对应的comment，那么可以用：
using HtmlAgilityPack;
public string htmlRemoveTag(string html)
{
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.LoadHtml(html);
if (htmlDoc == null)
{
return "";
}
// 1. remove all comments
//(1)get all comment nodes using XPATH
foreach (HtmlNode comment in htmlDoc.DocumentNode.SelectNodes("//comment()"))
{
//(2) remove comment node itself
comment.ParentNode.RemoveChild(comment);
}
//2. get all content
string filteredHtml = "";
foreach (var node in htmlDoc.DocumentNode.ChildNodes)
{
filteredHtml += node.InnerText;
}
return filteredHtml;
}
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