【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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | 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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | 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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | 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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