/// <summary>
/// Selects the first XmlNode that matches the XPath expression.
/// </summary>
/// <param name="xpath">The XPath expression. May not be null.</param>
/// <returns>The first <see cref="HtmlNode"/> that matches the XPath query or a null reference if no matching node was found.</returns>
public HtmlNode SelectSingleNode(string xpath)
{
if (xpath == null)
{
throw new ArgumentNullException("xpath");
}
HtmlNodeNavigator nav = new HtmlNodeNavigator(OwnerDocument, this);
XPathNodeIterator it = nav.Select(xpath);
if (!it.MoveNext())
{
return(null);
}
HtmlNodeNavigator node = (HtmlNodeNavigator)it.Current;
return(node.CurrentNode);
}
/// <summary>
/// Selects a list of nodes matching the <see cref="XPath"/> expression.
/// </summary>
/// <param name="xpath">The XPath expression.</param>
/// <returns>An <see cref="HtmlNodeCollection"/> containing a collection of nodes matching the <see cref="XPath"/> query, or <c>null</c> if no node matched the XPath expression.</returns>
public HtmlNodeCollection SelectNodes(XPathExpression xpath)
{
HtmlNodeCollection list = new HtmlNodeCollection(null);
HtmlNodeNavigator nav = new HtmlNodeNavigator(OwnerDocument, this);
XPathNodeIterator it = nav.Select(xpath);
while (it.MoveNext())
{
HtmlNodeNavigator n = (HtmlNodeNavigator)it.Current;
list.Add(n.CurrentNode, false);
}
if (list.Count == 0 && !OwnerDocument.OptionEmptyCollection)
{
return(null);
}
return(list);
}