HTML不会随HTML Agility Pack一起更新 [英] Html doesn't get updated with Html Agility Pack
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问题描述
我正在尝试从一段HTML中删除img和map元素.
I'm trying to remove the img and map element from a piece of html.
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
var oldHtml = doc.DocumentNode.InnerHtml;
if (doc.DocumentNode.SelectNodes("//img[@usemap]") != null)
{
HtmlNode img = doc.DocumentNode.SelectSingleNode("//img[@usemap]");
img.ParentNode.RemoveChild(img);
}
if (doc.DocumentNode.SelectNodes("//map") != null)
{
HtmlNode map = doc.DocumentNode.SelectSingleNode("//map");
map.ParentNode.RemoveChild(map);
}
var newHtml = doc.DocumentNode.InnerHtml;
newHtml仍然包含img和map元素.在html更新之前，我还需要做其他事情吗?
The newHtml still contains the img and map element. Do I need to do something else before the html is updated?
这是我要剥离的html:
Here is the html that I'm trying to strip:
<p><img src="/media/8301/HD00_498x299.jpg" width="498" height="299" alt="HD00.JPG" usemap="#imgmap201392714219"/><br />
<br />
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<br />
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</a></strong> <map name="imgmap2012104102243"
id="imgmap2012104102243">
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shape="rect" coords="188,80,213,102" target="_blank" alt="" />
</map><map id="imgmap201392714219">
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</map></p>
当我调试img和map元素时，但是调用RemoveChild根本不会更改html.另外，当我尝试更改属性或其他任何东西时，都不会发生.
When I debug the img and map element are found, but calling RemoveChild doesn't change the html at all. Also when I try to change an attribute or something else nothing happens.
推荐答案
我刚刚发现HTML Agility Pack的错误在于，您只能要求一次.InnerHtml.在那之后，它将不会更新.您要求两次:
I've just discovered that the bug with HTML Agility pack is that you can only ask for .InnerHtml once. After that, it will not update. You are asking for it twice:
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
var oldHtml = doc.DocumentNode.InnerHtml;
if (doc.DocumentNode.SelectNodes("//img[@usemap]") != null)
{
HtmlNode img = doc.DocumentNode.SelectSingleNode("//img[@usemap]");
img.ParentNode.RemoveChild(img);
}
if (doc.DocumentNode.SelectNodes("//map") != null)
{
HtmlNode map = doc.DocumentNode.SelectSingleNode("//map");
map.ParentNode.RemoveChild(map);
}
var newHtml = doc.DocumentNode.InnerHtml;
如果您摆脱了这一行:
If you get rid of this line:
var oldHtml = doc.DocumentNode.InnerHtml;
应该可以. HtmlAgilityPack似乎是一个随机错误.
It should work. It seems to be a random bug with HtmlAgilityPack.
Sniffdk的解决方案之所以有效，是因为他只得到一次.OuterHtml. HtmlUtilityPack家伙需要修复它.
Sniffdk's solution works because he only gets .OuterHtml once. The HtmlUtilityPack guys need to fix that.
这篇关于HTML不会随HTML Agility Pack一起更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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