Easy processing of XML data in the. NET Framework (4-3)

?? The code in Figure VIII shows an XML stream that converts a string of data to BASE64 encoding. Figure IX is the result of the output.


Figure 8 Persisting a String Array as Base64

Using System;

Using System.Text;

Using System.IO;

Using System.Xml;



Class Mybase64array

{

public static void Main (string[] args)

{

String outputfilename = ' Test64.xml ';

if (args. Length > 0)

OutputFileName = Args[0]; File name



Convert an array to XML

String[] TheArray = {' Rome ', ' New York ', ' Sydney ', ' Stockholm ',

' Paris '};



Createoutput (TheArray, outputfilename);

Return

}



private static void Createoutput (string[] thearray, string filename)

{

Open XML writer

XmlTextWriter XMLW = new XmlTextWriter (filename, null);

Causes child elements to set indents based on indentation and IndentChar. This option indents only the element content

XMLW. formatting = formatting.indented;

Write XML declaration with version "1.0"

XMLW. WriteStartDocument ();

Writes out a comment that contains the specified text.

XMLW. WriteComment (' Array to Base64 XML ');

Start writing out an array node

XMLW. WriteStartElement (' array ');

Writes out a property with the specified prefix, local name, namespace URI, and value

XMLW. WriteAttributeString (' xmlns ', ' x ', null, ' Dinoe:msdn-mag ');

Looping a child node into an array

foreach (string s in TheArray)

{

Writes out the specified start tag and associates it with the given namespace and prefix.

XMLW. WriteStartElement (' x ', ' element ', NULL);

Convert s to byte[] array and encode the byte[] array to Base64 and write the result text, the number of bytes to write into is twice times the total length of s, and a string is 2 bytes.

XMLW. WriteBase64 (Encoding.Unicode.GetBytes (s), 0, s.length*2);

Enclosing child nodes

XMLW. WriteEndElement ();

}

Closed root node, only level two

XMLW. WriteEndDocument ();



Closed writer

XMLW. Close ();



Read the contents of the write-in

XmlTextReader reader = new XmlTextReader (Filname);

while (reader. Read ())

{

Gets the node named element

if (reader. LocalName = = ' element ')

{



byte[] bytes = new byte[1000];

int n = reader. ReadBase64 (bytes, 0, 1000);

String buf = Encoding.Unicode.GetString (bytes);



Console.WriteLine (BUF. Substring (0,n));

}

}

Reader. Close ();



}

}

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