ASP.Net/XML/DOM
Traversing the DOM Tree
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Xml" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
string xmlPath = MapPath("Books.xml");
XmlDocument doc = new XmlDocument();
//doc.Load(xmlPath);
doc.LoadXml("<employees>" +
"<employee id="1">" +
"<name><firstName>First Name</firstName>" +
"<lastName>Last Name</lastName>" +
"</name><city>City</city>" +
"<state>WA</state><zipCode>99999</zipCode>" +
"</employee></employees>");
XmlNode rootNode = doc.DocumentElement;
DisplayNodes(rootNode);
}
void DisplayNodes(XmlNode node)
{
//Print the node type, node name and node value of the node
if (node.NodeType == XmlNodeType.Text) {
Response.Write("Type= [" + node.NodeType+ "] Value=" + node.Value + "<br>");
} else {
Response.Write("Type= [" + node.NodeType+"] Name=" + node.Name + "<br>");
}
//Print attributes of the node
if (node.Attributes != null) {
XmlAttributeCollection attrs = node.Attributes;
foreach (XmlAttribute attr in attrs) {
Response.Write("Attribute Name =" + attr.Name+ "Attribute Value =" + attr.Value);
}
}
//Print individual children of the node
XmlNodeList children = node.ChildNodes;
foreach (XmlNode child in children)
{
DisplayNodes(child);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Traversing the DOM Tree</title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
Use XML Document (DOM) to select one Node
<%@ Page Language="C#"%>
<%@ Import Namespace="System.Xml" %>
<%@ Import Namespace="System.Xml.Schema" %>
<script runat="server">
private StringBuilder stringBuilder = new StringBuilder();
void Page_Load(object sender, EventArgs e)
{
string xmlPath = MapPath("Authors.xml");
string xsdPath = MapPath("Authors.xsd");
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlPath);
XmlElement authorElement = (XmlElement) xmlDoc.DocumentElement.SelectSingleNode("//authors/author[authorID="000-00-0001"]");
authorElement.SetAttribute("nfex", "nfex");
XmlNodeReader nodeReader = new XmlNodeReader(xmlDoc);
XmlReader reader = null;
XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationEventHandler += new ValidationEventHandler(this.ValidationEventHandler);
settings.ValidationType = ValidationType.Schema;
settings.Schemas.Add(null, XmlReader.Create(xsdPath));
reader = XmlReader.Create(nodeReader, settings);
while (reader.Read())
{
}
if (stringBuilder.ToString() == String.Empty)
Response.Write("Validation completed successfully.");
else
Response.Write("Validation Failed. <br>" + stringBuilder.ToString());
}
void ValidationEventHandler(object sender, ValidationEventArgs args)
{
stringBuilder.Append("Validation error: " + args.Message + "<br>");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DOM Validation</title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
<%-- File: Authors.xml
<?xml version="1.0"?>
<authors>
<author>
<authorID>000-00-0001</authorID>
<lastName>Nancy</lastName>
<firstName>Lee</firstName>
<phone>999 999-9999</phone>
<address>9999 York St.</address>
<city>Regina</city>
<state>LA</state>
<zip>99999</zip>
<contract>true</contract>
</author>
<author>
<authorID>000-00-0002</authorID>
<lastName>First</lastName>
<firstName>Last</firstName>
<phone>415 986-7020</phone>
<address>No Name St.</address>
<city>Vancouver</city>
<state>BC</state>
<zip>88888</zip>
<contract>true</contract>
</author>
</authors>
--%>
<%-- File: Authors.xsd
<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="authors">
<xs:complexType>
<xs:sequence>
<xs:element maxOccurs="unbounded" name="author">
<xs:complexType>
<xs:sequence>
<xs:element name="authorID" type="xs:string" />
<xs:element name="lastName" type="xs:string" />
<xs:element name="firstName" type="xs:string" />
<xs:element name="phone" type="xs:string" />
<xs:element name="address" type="xs:string" />
<xs:element name="city" type="xs:string" />
<xs:element name="state" type="xs:string" />
<xs:element name="zip" type="xs:unsignedInt" />
<xs:element name="contract" type="xs:boolean" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
--%>