ASP.NET Tutorial/XML/XmlNode
Display data in XML file recursively (VB.net)
<source lang="csharp">
<%@ Page Language="VB" %> <%@ Import Namespace="System.Xml" %> <script runat=server>
sub Page_Load(Sender as Object, e as EventArgs)
dim xmldoc as new XMLDocument()
xmldoc.Load(Server.MapPath("Data.xml"))
ShowTree(xmldoc.DocumentElement)
end sub
sub ShowTree(node as XMLNode)
Dim attrnode As XmlNode
Dim map As XmlNamedNodeMap
If Not(node.HasChildNodes)
output.Text += "" & node.Name & " <" & _
node.Value & ">
" & vbcrlf
Else
output.Text += "" & node.Name & ""
If node.NodeType = XmlNodeType.Element Then
map = node.Attributes
For Each attrnode In map
output.Text += " " & attrnode.Name & " <" & _
attrnode.Value & "> " & vbcrlf
Next
End If
output.Text += "
"
End If
If node.HasChildNodes then
node = node.FirstChild
While not IsNothing(node)
ShowTree(node)
node = node.NextSibling
end while
end if
end sub
</script> <html><body>
<asp:Label id="output" runat="server" />
</body></html> File: Data.xml <?xml version="1.0"?> <bookstore>
<book genre="asdf">
<title>asdf</title>
<author>
<first-name>asdf</first-name>
<last-name>asdf</last-name>
</author>
<price>asdf</price>
</book>
<book genre="asdf">
<title>asdf</title>
<author>
<first-name>asdf</first-name>
<last-name>asdf</last-name>
</author>
<price>asdf</price>
</book>
<book genre="asdf">
<title>asdf</title>
<author>
<first-name>asdf</first-name>
<last-name>asdf</last-name>
</author>
<price>asdf</price>
</book>
</bookstore></source>
Load data from XML
<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="HolmesQuote" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
</form>
</body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Xml; public partial class HolmesQuote : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e)
{
MyQuote quotes = new MyQuote(Server.MapPath("./Data.xml"));
Quotation quote = quotes.GetRandomQuote();
Response.Write("" + quote.Source + " (" + quote.Date + ")");
Response.Write("" + quote.QuotationText + "");
}
} public class Quotation {
private string qsource;
private string date;
private string quotation;
public Quotation(XmlNode quoteNode)
{
if ( (quoteNode.SelectSingleNode("source")) != null)
qsource = quoteNode.SelectSingleNode("source").InnerText;
if ( (quoteNode.Attributes.GetNamedItem("date")) != null)
date = quoteNode.Attributes.GetNamedItem("date").Value;
quotation = quoteNode.FirstChild.InnerText;
}
public string Source
{
get
{
return qsource;
}
set
{
qsource = value;
}
}
public string Date
{
get
{
return date;
}
set
{
date = value;
}
}
public string QuotationText
{
get
{
return quotation;
}
set
{
quotation = value;
}
}
} public class MyQuote {
private XmlDocument quoteDoc;
private int quoteCount;
public MyQuote(string fileName)
{
quoteDoc = new XmlDocument();
quoteDoc.Load(fileName);
quoteCount = quoteDoc.DocumentElement.ChildNodes.Count;
}
public Quotation GetRandomQuote()
{
int i;
Random x = new Random();
i = x.Next(quoteCount-1);
return new Quotation( quoteDoc.DocumentElement.ChildNodes[i] );
}
} File: Data.xml <?xml version="1.0"?> <quotations>
<quotation date="1887">
A
<source>W</source> </quotation> <quotation date="1887">
t
<source>S</source> </quotation>
</quotations></source>
MoveToNextAttribute
<source lang="csharp">
<%@ import Namespace="System" %> <%@ import Namespace="System.Xml" %> <%@ Page Language="C#" %> <script runat="server">
XmlTextReader _Reader;
public void Page_Load(Object Source, EventArgs E)
{
try{
_Reader = new XmlTextReader(Server.MapPath("Data.xml"));
ReadDocument(_Reader);
}
catch (Exception _Error){
ErrorLabel.Text = _Error.Message;
}
finally{
_Reader.Close();
}
}
public void ReadDocument(XmlTextReader _XmlReader)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder(100);
String space3 = " ";
String space = " ";
while (_XmlReader.Read())
{
switch(_XmlReader.NodeType)
{
case XmlNodeType.Element:
sb.Append("Element: ");
sb.Append(_XmlReader.Name);
sb.Append("
");
if (_XmlReader.AttributeCount > 0)
{
while (_XmlReader.MoveToNextAttribute())
{
sb.Append(space3);
sb.Append("Attribute Name: ");
sb.Append(_XmlReader.Name);
sb.Append(space);
sb.Append("Attribute Value: ");
sb.Append(_XmlReader.Value);
sb.Append("
");
}
}
break;
case XmlNodeType.Text:
sb.Append(space3);
sb.Append("Value: ");
sb.Append(_XmlReader.Value);
sb.Append("
");
break;
}
}
OutputLiteral.Text = sb.ToString();
}
</script> <html>
<head>
<title>Using the XmlTextReader</title>
</head>
<body>
<form runat="server">
<asp:Literal id="OutputLiteral" runat="server" EnableViewState="False"></asp:Literal>
<asp:Label id="ErrorLabel" runat="server" ForeColor="Red"></asp:Label>
</form>
</body>
</html></source>
