в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:17:33Z

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==Create XPathNavigator object by calling CreateNavigator of XmlDocument==

<source lang="csharp">using System;
using System.Xml.XPath;
using System.Xml;
class MainClass
{
static void Main(string[] args)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"c:\books.xml");

XPathNavigator nav = xmlDoc.CreateNavigator();
Console.WriteLine("Author First Name");
XPathNodeIterator itrator = nav.Select("descendant::first-name");
while( itrator.MoveNext() )
{
Console.WriteLine(itrator.Current.Value.ToString());
}
}
}</source>

==Get Node information by using XPathNavigator==

<source lang="csharp">using System;
using System.Xml.XPath;
using System.Xml;
class MainClass
{
static void Main(string[] args)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"c:\books.xml");

XPathNavigator nav = xmlDoc.CreateNavigator();
nav.MoveToRoot();
string name = nav.Name;
Console.WriteLine("Root node info: ");
Console.WriteLine("Base URI" + nav.BaseURI.ToString());
Console.WriteLine("Name: " +nav.Name.ToString());
Console.WriteLine("Node Type: "+ nav.NodeType.ToString());
Console.WriteLine("Node Value: "+nav.Value.ToString());

if (nav.HasChildren)
{
nav.MoveToFirstChild();
GetNodeInfo(nav);
}
}
private static void GetNodeInfo( XPathNavigator nav1)
{
Console.WriteLine("Name: " +nav1.Name.ToString());
Console.WriteLine("Node Type: "+ nav1.NodeType.ToString());
Console.WriteLine("Node Value: "+nav1.Value.ToString());

if (nav1.HasChildren)
{
nav1.MoveToFirstChild();

while( nav1.MoveToNext() )
{
GetNodeInfo(nav1);
nav1.MoveToParent();
}
} else {
nav1.MoveToNext();
GetNodeInfo(nav1);
}
}
}</source>

==Select a node==

<source lang="csharp">using System;
using System.Xml.XPath;
using System.Xml;
class MainClass
{
static void Main(string[] args)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"c:\books.xml");

XPathNavigator nav = xmlDoc.CreateNavigator();
Console.WriteLine("Author First Name");
XPathNodeIterator itrator = nav.Select("descendant::first-name");
while( itrator.MoveNext() )
{
Console.WriteLine(itrator.Current.Value.ToString());
}
}
}</source>

==XPathNavigator: Evaluate==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.XPath;
class MainClass
{
static void Main(string[] args)
{
string xml = "<Order>" +
"<Item>" +
"<Description>Some widget part</Description>" +
"<Price>12.99</Price>" +
"</Item>" +
"<Item>" +
"<Description>Another widget</Description>" +
"<Price>50.12</Price>" +
"</Item>" +
"</Order>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
XPathNavigator nav = doc.CreateNavigator();
Console.WriteLine("Total price for this order is ${0}", nav.Evaluate("sum(Order/Item/Price)"));
}
}</source>
<pre class=codeResult>Total price for this order is $63.11</pre>

==XPathNavigator: XPathNodeIterator with comparison ==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.XPath;
class MainClass
{
static void Main(string[] args)
{
string xml = "<Order>" +
"<Item>" +
"<Description>widget part</Description>" +
"<Price>1.9</Price>" +
"</Item>" +
"<Item>" +
"<Description>Another widget</Description>" +
"<Price>5.2</Price>" +
"</Item>" +
"</Order>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
XPathNavigator nav = doc.CreateNavigator();
XPathNodeIterator nodes = nav.Select("/Order/Item[Price>10]/Description");
while (nodes.MoveNext())
{
Console.WriteLine("Item {0} has a price greater than 10",nodes.Current.Value);
}
}
}</source>

==XPathNodeIterator from a select-node statement==

<source lang="csharp">using System;
using System.Xml.XPath;
using System.Xml;
class MainClass
{
static void Main(string[] args)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"c:\books.xml");

XPathNavigator nav = xmlDoc.CreateNavigator();
Console.WriteLine("Author First Name");
XPathNodeIterator itrator = nav.Select("descendant::first-name");
while( itrator.MoveNext() )
{
Console.WriteLine(itrator.Current.Value.ToString());
}
}
}</source>

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в 15:31, 26 мая 2010

Admin: 1 версия