如何使用HTML Agility Pack清理格式不正确的HTML [英] How to clean up poorly formed HTML using HTML Agility Pack

问题描述

我正在尝试替换这个可怕的正则表达式集合，该集合目前用于清理格式不正确的HTML块，并且偶然发现了C#的HTML Agility Pack.它看起来非常强大，但我找不到如何使用该包的示例，在我看来，这将是其中包含的所需功能.我确定我是个白痴，在文档中找不到合适的方法.

I am attempting to replace this god awful collection of regular expressions that is currently used to clean up blocks of poorly formed HTML and stumbled upon the HTML Agility Pack for C#. It looks very powerful but yet, I couldn't find an example of how I want to use the pack which, in my mind, would be a desired functionality included in it. I am sure I am an idiot and cannot find a suitable method in the documentation.

让我解释一下...说我有以下html:

Let me explain... say I had the following html:

<p class="someclass">
    <font size="3">
        <font face="Times New Roman">
            this is some text
            <a href="somepage.html">Some link</a>
        </font>
    </font>
</p>

...我想要的样子:

... that I want to look like:

<p>
    this is some text
    <a href="somepage.html">Some link</a>
</p>

当我使用HtmlNode.Remove()方法时，它将删除该节点及其所有子节点.有没有办法删除保留子节点的节点?

When I utilize the HtmlNode.Remove() method it removes the node plus all it's children. Is there a way to remove the node preserving the children?

推荐答案

在HtmlNode上，方法RemoveChild具有以下重载:

On HtmlNode, the method RemoveChild has this overload:

public HtmlNode RemoveChild(HtmlNode oldChild, bool keepGrandChildren);

这就是您要这样做的方式:

So this is how you would do it:

HtmlDocument doc = new HtmlDocument();
doc.Load("yourfile.htm");

foreach (HtmlNode font in doc.DocumentNode.SelectNodes("//font"))
{
    font.ParentNode.RemoveChild(font, true);
}

:替换为w/keepGrandChildren"选项似乎无法正常工作，因此这是一个替代实现:

It looks like the Replace w/ keepGrandChildren option is not working as expected, so here is an alternate implementation:

public static HtmlNode RemoveChild(HtmlNode parent, HtmlNode oldChild, bool keepGrandChildren)
{
    if (oldChild == null)
        throw new ArgumentNullException("oldChild");

    if (oldChild.HasChildNodes && keepGrandChildren)
    {
        HtmlNode prev = oldChild.PreviousSibling;
        List<HtmlNode> nodes = new List<HtmlNode>(oldChild.ChildNodes.Cast<HtmlNode>());
        nodes.Sort(new StreamPositionComparer());
        foreach (HtmlNode grandchild in nodes)
        {
            parent.InsertAfter(grandchild, prev);
        }
    }
    parent.RemoveChild(oldChild);
    return oldChild;
}

// this helper class allows to sort nodes using their position in the file.
private class StreamPositionComparer : IComparer<HtmlNode>
{
    int IComparer<HtmlNode>.Compare(HtmlNode x, HtmlNode y)
    {
        return y.StreamPosition.CompareTo(x.StreamPosition);
    }
}

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