public static void Main()
{
//<catalog>
// <cd country="USA">
// <title>Empire Burlesque</title>
// <artist>Bob Dylan</artist>
// <price>10.90</price>
// </cd>
// <cd country="UK">
// <title>James Bond</title>
// <artist>Hello World</artist>
// <price>123456</price>
// </cd>
//</catalog>
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.Load("xml.xml");
var node = doc.DocumentNode.SelectSingleNode("/catalog/cd/@country"); // TODO : 选择的是cd元素而不是country属性
Console.WriteLine(node.GetType());
Console.WriteLine(node);
HtmlAgilityPack.HtmlNodeNavigator docx = new HtmlAgilityPack.HtmlNodeNavigator("xml.xml");
var nodex = docx.SelectSingleNode("/catalog/cd/@country"); // TODO 不能使用SelectNodes
var ss = nodex.SelectSingleNode("//price");
Debug.WriteLine(ss?.Value ?? "null");
nodex.MoveToRoot();
var ss2 = nodex.SelectSingleNode("//price");
Debug.WriteLine(ss2?.Value ?? "null");
nodex.MoveToFirstChild();
Console.WriteLine(nodex.GetType());
Console.WriteLine(nodex.Value); // 这个解决了属性选择的问题
var r = docx.Select("/catalog/cd/@country").Cast <HtmlNodeNavigator>();
// http://stackoverflow.com/questions/26744559/htmlagilitypack-xpath-and-regex TODO 关于 SelectNodes 的解决方案
var nodes = docx.SelectSet("/catalog/cd/@country");
//XmlDocument doc = new XmlDocument();
//doc.Load("xml.xml");
//var r = doc.DocumentElement.SelectSingleNode("//@country"); // !! XmlDocodument就支持
}
/// <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");
var nav = new HtmlNodeNavigator(OwnerDocument, this);
var it = nav.Select(xpath);
if (!it.MoveNext())
return null;
var 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(string xpath)
{
var list = new HtmlNodeCollection(null);
var nav = new HtmlNodeNavigator(OwnerDocument, this);
var it = nav.Select(xpath);
while (it.MoveNext())
{
var n = (HtmlNodeNavigator)it.Current;
list.Add(n.CurrentNode);
}
return list.Count == 0 ? null : list;
}
/// <summary>
/// Selects a list of nodes or attributes 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 empty collection if no node matched the XPath expression.</returns>
public HtmlCollection Select(string xpath)
{
var list = new HtmlCollection();
HtmlNodeNavigator nav = new HtmlNodeNavigator(OwnerDocument, this);
XPathNodeIterator it = nav.Select(xpath);
while (it.MoveNext())
{
HtmlNodeNavigator n = (HtmlNodeNavigator)it.Current;
list.Add(n.Current);
}
return(list);
}
/// <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(string 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);
}
return list;
}
/// <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(string 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);
}
if (list.Count == 0)
{
return(null);
}
return(list);
}
/// <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 List <IHtmlBaseNode> SelectNodes(string xpath)
{
List <IHtmlBaseNode> list = new List <IHtmlBaseNode>();
HtmlNodeNavigator nav = new HtmlNodeNavigator(_ownerdocument, this);
XPathNodeIterator it = nav.Select(xpath);
while (it.MoveNext())
{
HtmlNodeNavigator n = (HtmlNodeNavigator)it.Current;
list.Add(n.CurrentNode);
}
//if (list.Count == 0)
//{
// return null;
//}
return(list);
}
/// <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);
}
/// <summary>
/// Selects a list of nodes matching the XPath expression.
/// </summary>
/// <param name="xpath">The XPath expression.</param>
/// <returns>An HtmlNodeCollection containing a collection of nodes matching the XPath query, or null if no node matched the XPath expression.</returns>
public HtmlNodeCollection SelectNodes(string xpath)
{
HtmlNodeCollection list = new HtmlNodeCollection(null);
try
{
HtmlNodeNavigator nav = new HtmlNodeNavigator(_ownerdocument, this);
XPathNodeIterator it = nav.Select(xpath);
while (it.MoveNext())
{
HtmlNodeNavigator n = (HtmlNodeNavigator)it.Current;
list.Add(n.CurrentNode);
}
}
catch (Exception ex)
{
O2.Kernel.ExtensionMethods.Logging_ExtensionMethods.log(ex, "in HtmlNodeCollection SelectNodes");
}
//DC removed this so that we get an empty list when there are no matching nodes
//if (list.Count == 0)
//{
// return null;
//}
return list;
}
