private static NodeList ApplySelection(NodeList nodeList, string xpath)
{
Guard.ArgumentNotNullOrEmpty(xpath, "xpath");
if (xpath[0] == '/')
{
throw new ArgumentException("XPath expressions starting with '/' are not supported", "xpath");
}
if (xpath.IndexOf("//") >= 0)
{
throw new ArgumentException("XPath expressions with '//' are not supported", "xpath");
}
string head = xpath;
string tail = null;
int slash = xpath.IndexOf('/');
if (slash >= 0)
{
head = xpath.Substring(0, slash);
tail = xpath.Substring(slash + 1);
}
NodeList resultNodes = new NodeList();
NodeFilter filter = new NodeFilter(head);
foreach (XmlNode node in nodeList)
{
foreach (XmlNode childNode in node.ChildNodes)
{
if (filter.Pass(childNode))
{
resultNodes.Add(childNode);
}
}
}
return(tail != null
? ApplySelection(resultNodes, tail)
: resultNodes);
}
