Why is this HtmlAgilityPack operation invalid when there are, indeed, matching elements?

Question

I get \"InvalidOperationException > Message=Sequence contains no matching element\" with the following code:

private void buttonLoadHTML_Click(object sender,         


        

Answer 1

It turns out to be pretty easy; this is not complete, but this, inspired by this answer, is enough to get started:

HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();

// There are various options, set as needed
htmlDoc.OptionFixNestedTags = true;

htmlDoc.Load(@"C:\Platypus\dplatypus.htm");

if (htmlDoc.DocumentNode != null)
{
    IEnumerable<HtmlAgilityPack.HtmlNode> textNodes = htmlDoc.DocumentNode.SelectNodes("//text()");
    foreach (HtmlNode node in textNodes)
    {
        if (!string.IsNullOrWhiteSpace(node.InnerText))
        {
            MessageBox.Show(node.InnerText);
        }
    }
}