Reading a File Using the XmlTextReader in .NET

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Reading a File Using the XmlTextReader
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The XmlTextReader is used to read an XML file, node by node. The reader provides forward-only, noncaching, access to an XML data stream. The reader is ideal for use when there is a possibility that the information that is desired is near the top of the XML file, and the file is large. If random access is required, use the XPathNavigator or the XmlDocument. The following code reads the XML file that was created in the previous example and displays information about each node:
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Private Sub Button11_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button11.Click Dim xmlReader As New _ XmlTextReader( C:\EmployeeList.XML ) Do While xmlReader.Read() Select Case xmlReader.NodeType Case XmlNodeType.XmlDeclaration, _ XmlNodeType.Element, _ XmlNodeType.Comment Dim s As String s = s.Format( {0}: {1} = {2}<br> , _ xmlReader.NodeType, _ xmlReader.Name, _ xmlReader.Value) Response.Write(s) Case XmlNodeType.Text Dim s As String s = s.Format( - Value: {0}<br> , _ xmlReader.Value) Response.Write(s) End Select If xmlReader.HasAttributes Then Do While xmlReader.MoveToNextAttribute() Dim s As String s = s.Format( - Attribute: {0} = {1}<br> , _ xmlReader.Name, xmlReader.Value) Response.Write(s) Loop End If Loop xmlReader.Close() End Sub
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Figure 9.9 shows the browser output. This code opens the EmployeeList file and then performs a simple loop, reading one element at a time until finished. For each node that is read, a check is made on the NodeType, and the node information is printed.
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Figure 9.9 The browser output when reading an XML file and displaying information about each node.
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When a node is read, its corresponding attributes are read as well. A check is made to see if the node has attributes, and, if so, they are displayed.
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The XslTransform class provides a simple method of transforming an XML file, using an xsl stylesheet. The XslTransform supports XSLT 1.0 syntax. The XSLT stylesheet must reference the following namespace:
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This class has two methods: Load and Transform. The Load method is used to load an xsl stylesheet. The Transform method has several overloads, but basically expects an XML source, a destination, and, optionally, an XsltArgumentList object. The XSL stylesheet supports script as well as .NET languages. The example that follows embeds a Visual Basic .NET function to format the hire date of the employee before placing the date into the HTML table. The following example uses the EmployeeList.XML file that was created in the previous XmlTextWriter example (see Figure 9.8). This example takes an XSL stylesheet, and transforms the EmployeeList into formatted HTML. The HTML is sent to a file, and then the HTML is sent to right out to the Response stream to the browser. The following is the EmployeeList.xsl file:
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<xsl:stylesheet version= 1.0 xmlns:xsl= xmlns:msxsl= urn:schemas-microsoft-com:xslt xmlns:labs= > <msxsl:script implements-prefix= labs language= VB > <![CDATA[ Add code here. function FormatDate( _ d as System.XML.XPath.XPathNodeIterator ) as string dim ret as string= dim nav as XPathNavigator = d.Current nav.MoveToFirstChild() ret = XmlConvert.ToDateTime( _ nav.Value).ToShortDateString() return ret end function ]]> </msxsl:script> <xsl:template match= / > <html> <head> <title>Employee List</title> </head> <body> <center> <h1>Employee List</h1> <xsl:call-template name= CreateHeading /> </center> </body> </html> </xsl:template> <xsl:template name= CreateHeading > <table border= 1 width= 100% cellpadding= 4 > <tr > <th><font size= 4 > <b>Employee ID</b> </font></th>
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<th><font size= 4 > <b>Last Name</b> </font></th> <th><font size= 4 > <b>First Name</b> </font></th> <th><font size= 4 > <b>Hire Date</b> </font></th> <th><font size= 4 > <b>Salary</b> </font></th> </tr> <xsl:call-template name= CreateTable /> <xsl:call-template name= GetTotal /> </table> </xsl:template> <xsl:template name= CreateTable > <xsl:for-each select= /EmployeeList/Employee > <tr> <td align= center > <xsl:value-of select= @EmpID /> </td> <td> <xsl:value-of select= @LastName /> </td> <td> <xsl:value-of select= @FirstName /> </td> <td> <xsl:value-of select= labs:FormatDate(HireDate) /> </td> <td align= right > <xsl:value-of select= format-number(@Salary, $#,##0.00 ) /> </td> </tr> </xsl:for-each> </xsl:template> <xsl:template name= GetTotal > <tr> <td align= right colspan= 4 > <font size= 4 > <b>Total Salaries:</b> </font> </td> <td align= right ><font size= 4 > <b><xsl:value-of select= format-number(sum( /EmployeeList/Employee/@Salary), $#,##0.00 ) /></b>
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