public void DynamicVariable()
{
string expr = "//mvp:titles[mvp:price > 10]";
string dyn = "//mvp:titles[mvp:price > $price]";
int price = 10;
XPathNavigator docnav = Document.CreateNavigator();
XPathExpression xpath = docnav.Compile(expr);
XmlNamespaceManager mgr = new XmlNamespaceManager(docnav.NameTable);
mgr.AddNamespace(Globals.MvpPrefix, Globals.MvpNamespace);
xpath.SetContext(mgr);
int count1 = Document.CreateNavigator().Select(xpath).Count;
// Test with compiled expression.
int count2 = XPathCache.Select(expr, Document.CreateNavigator(), mgr).Count;
Assert.AreEqual(count1, count2);
// Test with dynamic expression.
count2 = XPathCache.Select(dyn, Document.CreateNavigator(),
mgr, new XPathVariable("price", price)).Count;
Assert.AreEqual(count1, count2);
}
public void Reading()
{
Stream stm = Globals.GetResource(Globals.PubsNsResource);
XmlTextReader tr = new XmlTextReader(stm);
XPathDocument doc = new XPathDocument(tr);
XPathNavigator nav = doc.CreateNavigator();
// Dumps the entire document to output.
XmlTextWriter tw = new XmlTextWriter(Console.Out);
tw.WriteNode(new XPathNavigatorReader(nav), true);
// Perform a query, then dump the first node (OuterXml) from the result.
nav = doc.CreateNavigator();
XmlNamespaceManager mgr = new XmlNamespaceManager(nav.NameTable);
mgr.AddNamespace("mvp", "mvp-xml");
XPathNodeIterator it = XPathCache.Select("//mvp:titles[mvp:title_id='BU2075']", nav, mgr);
if (it.MoveNext())
{
XmlReader title = new XPathNavigatorReader(it.Current);
// As it's a regular reader, we must first move it to content as usual.
title.MoveToContent();
Console.WriteLine(title.ReadOuterXml());
}
// Perform arbitrary movements, then serialize inner content.
nav = doc.CreateNavigator();
nav.MoveToFirstChild();
nav.MoveToFirstChild();
Console.WriteLine(new XPathNavigatorReader(nav).ReadInnerXml());
}
/// <summary>
/// This code is just to show how it's used.
/// If run it will throw exceptions.
/// </summary>
public void Test()
{
XPathNavigator document = new XPathDocument(String.Empty).CreateNavigator();
XPathNodeIterator it = XPathCache.Select("/customer/order/item", document);
it = XPathCache.Select("/customer/order[id=$id]/item", document,
new XPathVariable("id", "23"));
string[] ids = null;
foreach (string id in ids)
{
it = XPathCache.Select("/customer/order[id=$id]/item", document,
new XPathVariable("id", id));
}
XmlNamespaceManager mgr = new XmlNamespaceManager(document.NameTable);
mgr.AddNamespace("po", "example-po");
it = XPathCache.Select("/po:customer[id=$id]", document, mgr,
new XPathVariable("id", "0736"));
XmlDocument doc = new XmlDocument();
XmlNodeList list = XPathCache.SelectNodes("/customer", doc);
}
/// <summary>
/// Evaluates <see cref="XPointer"/> pointer and returns
/// iterator over pointed nodes.
/// </summary>
/// <remarks>Note, that returned XPathNodeIterator is already moved once.</remarks>
/// <param name="nav">XPathNavigator to evaluate the
/// <see cref="XPointer"/> on.</param>
/// <returns><see cref="XPathNodeIterator"/> over pointed nodes</returns>
public override XPathNodeIterator Evaluate(XPathNavigator nav)
{
XPathNodeIterator result = XPathCache.Select("id('" + ncName + "')", nav, (XmlNamespaceManager)null);
if (result != null && result.MoveNext())
{
return result;
}
throw new NoSubresourcesIdentifiedException(string.Format(CultureInfo.CurrentCulture, Properties.Resources.NoSubresourcesIdentifiedException, ncName));
}
public override XPathNodeIterator Evaluate(XPathNavigator doc, XmlNamespaceManager nm)
{
try
{
return(XPathCache.Select(_xpath, doc, nm));
}
catch
{
return(null);
}
}
/// <summary>
/// Evaluates <see cref="XPointer"/> pointer and returns
/// iterator over pointed nodes.
/// </summary>
/// <remarks>Note, that returned XPathNodeIterator is already moved once.</remarks>
/// <param name="nav">XPathNavigator to evaluate the
/// <see cref="XPointer"/> on.</param>
/// <returns><see cref="XPathNodeIterator"/> over pointed nodes</returns>
public override XPathNodeIterator Evaluate(XPathNavigator nav)
{
XPathNodeIterator result = XPathCache.Select("id('" + _NCName + "')", nav, (XmlNamespaceManager)null);
if (result != null && result.MoveNext())
{
return(result);
}
else
{
throw new NoSubresourcesIdentifiedException(SR.GetString("NoSubresourcesIdentifiedException", _NCName));
}
}
public void PrefixMapping()
{
string expr = "//mvp:titles[mvp:price > 10]";
XPathNavigator docnav = Document.CreateNavigator();
XPathExpression xpath = docnav.Compile(expr);
XmlNamespaceManager mgr = new XmlNamespaceManager(docnav.NameTable);
mgr.AddNamespace(Globals.MvpPrefix, Globals.MvpNamespace);
xpath.SetContext(mgr);
int count1 = Document.CreateNavigator().Select(xpath).Count;
int count2 = XPathCache.Select(expr, Document.CreateNavigator(),
new XmlPrefix(Globals.MvpPrefix, Globals.MvpNamespace, Document.CreateNavigator().NameTable)).Count;
Assert.AreEqual(count1, count2);
}
public override XPathNodeIterator Evaluate(XPathNavigator doc,
XmlNamespaceManager nm)
{
return(XPathCache.Select(XPath, doc, nm));
}