C# Html不'；无法使用Html敏捷包进行更新

我试图从一段html中删除img和map元素

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;

新的HTML仍然包含img和map元素。在更新html之前，是否需要执行其他操作

以下是我试图剥离的html：

<p><img src="/media/8301/HD00_498x299.jpg"  width="498"  height="299" alt="HD00.JPG" usemap="#imgmap201392714219"/><br />
<br />
 <a title="Download ZIP DWG"
href="/media/8103/detailtekeningen-dwg-unidek-aero.zip"
target="_blank">Klik hier om alle DWG&nbsp;bestanden in
een&nbsp;zipfile te downloaden.</a><br />
 <a title="Download DXF"
href="/media/8104/detailtekeningen-dxf-unidek-aero.zip"
target="_blank">Klik hier om alle DXF bestanden in een zipfile te
downloaden.</a><br />
 <a title="Download PDF"
href="/media/8116/detailtekeningen-pdf-unidek-aero.zip"
target="_blank">Klik hier om alle PDF bestanden in een zipfile te
downloaden.</a><br />
<br />
 <strong><a title="Bouwdetails berekende psi-waarden"
href="/{localLink:8014}" target="_blank">Link naar de technische
bouwdetails met verbeterde eigen ψ-waarden<br />
</a></strong> &nbsp;<map name="imgmap2012104102243"
id="imgmap2012104102243">
<area title="" href="/nl/producten/hellend-dak/unidek-aero/1"
shape="rect" coords="194,419,219,439" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/2"
shape="rect" coords="221,420,246,439" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/3"
shape="rect" coords="200,302,226,320" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/4"
shape="rect" coords="209,167,234,185" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/6"
shape="rect" coords="68,46,98,67" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/7"
shape="rect" coords="102,203,129,224" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/8"
shape="rect" coords="273,339,302,360" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/9"
shape="rect" coords="387,350,417,372" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/10"
shape="rect" coords="324,341,354,363" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/11"
shape="rect" coords="223,369,252,390" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/12"
shape="rect" coords="62,270,89,294" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/13"
shape="rect" coords="93,270,119,294" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/14"
shape="rect" coords="31,94,60,114" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/14"
shape="rect" coords="79,161,106,182" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/15"
shape="rect" coords="19,150,50,171" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/15"
shape="rect" coords="82,113,110,134" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/16"
shape="rect" coords="176,231,205,253" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/17"
shape="rect" coords="147,179,176,200" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/18"
shape="rect" coords="139,235,166,257" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/19"
shape="rect" coords="204,56,231,78" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/20"
shape="rect" coords="125,135,153,157" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/21"
shape="rect" coords="265,263,290,284" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/23"
shape="rect" coords="9,202,36,225" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/24"
shape="rect" coords="39,202,65,225" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/25"
shape="rect" coords="158,80,184,101" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/26"
shape="rect" coords="188,80,213,102" target="_blank" alt="" />
</map><map id="imgmap201392714219">
<area title="" href="/nl/producten/hellend-dak/unidek-aero/1"
shape="rect" coords="265,463,279,480" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/2"
shape="rect" coords="282,466,297,480" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/3"
shape="rect" coords="213,339,237,358" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/4"
shape="rect" coords="206,204,227,220" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/6"
shape="rect" coords="113,105,135,121" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/7"
shape="rect" coords="134,246,154,262" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/8"
shape="rect" coords="299,369,319,386" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/9"
shape="rect" coords="432,409,453,425" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/10"
shape="rect" coords="363,394,385,413" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/11"
shape="rect" coords="254,406,276,422" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/12"
shape="rect" coords="105,298,122,314" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/13"
shape="rect" coords="122,298,139,314" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/14"
shape="rect" coords="53,121,77,139" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/15"
shape="rect" coords="49,165,72,182" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/16"
shape="rect" coords="195,272,214,288" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/17"
shape="rect" coords="152,212,175,230" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/18"
shape="rect" coords="160,276,180,293" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/19"
shape="rect" coords="234,88,255,105" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/20"
shape="rect" coords="132,155,158,174" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/21"
shape="rect" coords="299,294,321,311" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/23"
shape="rect" coords="40,234,55,250" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/24"
shape="rect" coords="56,233,73,251" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/25"
shape="rect" coords="185,108,202,127" target="_blank" alt="" />
<area title="" href="/nl/producten/hellend-dak/unidek-aero/26"
shape="rect" coords="203,109,219,127" target="_blank" alt="" />
</map></p>

---

当我调试时，找到了img和map元素，但是调用RemoveChild根本不会改变html。另外，当我尝试更改属性或其他内容时，什么也不会发生。

删除节点后，HtmlAlityPack似乎不会更新

HtmlDocument.DocumentNode.InnerHtml

属性。最简单的解决方法是使用

OuterHtml

属性，而不是

InnerHtml

：

var newHtml = doc.DocumentNode.OuterHtml;

到目前为止，我总是使用

OuterHtml

属性来检查我所做的更改是否产生了预期的结果，并且现在才意识到

InnerHtml

的这种行为

更新：

在发布的HTML示例中，您有2个

元素。你的代码只删除一个。尝试用这种方法删除所有

和

节点：

if (doc.DocumentNode.SelectNodes("//img[@usemap]") != null)
{
    HtmlNodeCollection imgs = doc.DocumentNode.SelectNodes("//img[@usemap]");
    foreach (HtmlNode img in imgs)
    {
        img.ParentNode.RemoveChild(img);
    }
}

if (doc.DocumentNode.SelectNodes("//map") != null)
{
    HtmlNodeCollection maps = doc.DocumentNode.SelectNodes("//map");
    foreach (HtmlNode map in maps)
    {
        map.ParentNode.RemoveChild(map);
    }
}
var newHtml = doc.DocumentNode.OuterHtml;

[]

这对我很有用：

var doc = new HtmlDocument();
doc.LoadHtml(html);

var root = doc.DocumentNode;
if (root != null)
{
    var replace = false;

    images = root.SelectNodes("//img[@usemap]");
    if (images != null)
    {
        foreach (var image in images)
        {
            image.ParentNode.RemoveChild(image);
        }

        replace = true;
    }

    if (replace)
    {
        html = root.OuterHtml;
    }
}

var newhtml = html;

---

图像已从html中删除。

到目前为止，在html agility pack开始工作之前，我需要在Umbraco中执行此操作：

var documents = Document.GetDocumentsOfDocumentType(5125);
var document = documents.Where(x => x.Id == 5127).First();

var html = document.getProperty("content").Value.ToString();
html = html.Replace("\r\n", "");
html = umbraco.library.RemoveFirstParagraphTag(html);

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

---

我刚刚发现HTML Agility pack的缺陷在于，您只能请求

.InnerHtml

一次。之后，它将不会更新。你要求它两次：

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;

---

如果你去掉这一行：

var oldHtml = doc.DocumentNode.InnerHtml;

它应该会起作用。这似乎是一个带有HtmlAlityPack的随机错误

---

Sniffdk的解决方案有效，因为他只获得一次

.OuterHtml

。HtmlLityPack的人需要解决这个问题。

我尝试了OuterHtml，但结果是一样的。html仍然没有更新。更新了我的答案，根据您的html样本测试了代码（包装在

中），在这里对我来说效果很好，

newHtml

最后只包含

。看起来html有问题。此示例可以工作：，但我从Umbraco RTE获取的html无法工作。可能是因为它在html中有本地链接。不确定为什么您认为本地链接与此问题有关。。无论如何，如果不能够重现问题，就很难进一步诊断。如果您使用我在问题中发布的更新html，您应该能够重现问题，因为该html不起作用。PS-snifdk下面的解决方案有效，因为他只获得一次.OuterHtml。HTMLAlityPack的家伙们需要解决：）我在

HTMLAlityPack 1.4.6

（对InnerHtml的分配没有反映在调用OuterHtml中）上有一个类似的问题，它在升级到

HTMLAlityPack 1.4.9.5

后消失了。也许这个版本也能解决你的问题？