c# - Remove all empty/unnecessary nodes from HTML

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c# - Remove all empty/unnecessary nodes from HTML

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

What would be the preferred way to remove all empty and unnecessery nodes? For example

 should be removed and   should also be removed (so the br tag is considered unneccesery in this case)

Will I have to use some sort of recursive function for this? I'm thinking something along the lines of this maybe:

 RemoveEmptyNodes(HtmlNode containerNode)
 {
     var nodes = containerNode.DescendantsAndSelf().ToList();

      if (nodes != null)
      {
          foreach (HtmlNode node in nodes)
          {
              if (node.InnerText == null || node.InnerText == "")
              {
                   RemoveEmptyNodes(node.ParentNode);
                   node.Remove();
               }
           }
       }
  }

But that obviously doesn't work (stackoverflow exception).

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1 Answer

深蓝 · Answer 1 · 2021-10-23T20:04:53+0000

tags that should not be removed you can add the names to the list and nodes with attributes are also not removed because of containerNode.Attributes.Count == 0 (e.g. Images)

static List<string> _notToRemove;

static void Main(string[] args)
{
    _notToRemove = new List<string>();
    _notToRemove.Add("br");

    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml("<html><head></head><body><p>test</p><br><font><p><span></span></p></font></body></html>");
    RemoveEmptyNodes(doc.DocumentNode);
}

static void RemoveEmptyNodes(HtmlNode containerNode)
{
    if (containerNode.Attributes.Count == 0 && !_notToRemove.Contains(containerNode.Name) && string.IsNullOrEmpty(containerNode.InnerText))
    {
        containerNode.Remove();
    }
    else
    {
        for (int i = containerNode.ChildNodes.Count - 1; i >= 0; i-- )
        {
            RemoveEmptyNodes(containerNode.ChildNodes[i]);
        }
    }
}

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