我最终手动遍历树。但是使用扩展方法,一切都很好,而且不碍事。以防它将来可能对任何人有所帮助,这就是我为我的用例汇总的内容:
public static XElement GetRelativeNode(this XAttribute attribute)
{
return attribute.Parent.GetRelativeNode(attribute.Value);
}
public static string GetRelativeNode(this XElement node, string pathReference)
{
if (!pathReference.Contains("..")) return node; // Not relative reference
var parts = pathReference.Split(new string[] { "/"}, StringSplitOptions.RemoveEmptyEntries);
XElement current = node;
foreach (var part in parts)
{
if (string.IsNullOrEmpty(part)) continue;
if (part == "..")
{
current = current.Parent;
}
else
{
if (part.Contains("["))
{
var opening = part.IndexOf("[");
var targetNodeName = part.Substring(0, opening);
var ending = part.IndexOf("]");
var nodeIndex = int.Parse(part.Substring(opening + 1, ending - opening - 1));
current = current.Descendants(targetNodeName).Skip(nodeIndex-1).First();
}
else
{
current = current.Element(part);
}
}
}
return current;
}
然后你会像这样使用它(item
is an XElement
):
item.Element("topic").Attribute("reference").GetRelativeNode().Value