Easily process XML data in .NET Framework (4-3)

??The code in Figure 8 demonstrates converting a string data into a Base64 encoded XML stream. Figure 9 is the output result.


Figure 8 Persisting a String Array as Base64

using System;

using System.Text;

using System.IO;

using System.

public static void Main(String[] args)

{

string outputFileName = 'test64.xml';

if (args.Length > 0)

outputFileName = args[0]; // file name



//Convert the 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);

/ / Makes child elements indented based on Indentation and IndentChar settings. This option only indents the element content

xmlw.Formatting = Formatting.Indented;

//Write the XML declaration with version "1.0"

xmlw.WriteStartDocument();

//Write the XML declaration containing the specified text Comments .

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

//Start writing out the array node

xmlw.WriteStartElement('array');

//Write out the specified prefix, local name, namespace URI and value attributes

xmlw.WriteAttributeString('xmlns', 'x', null, 'dinoe:msdn-mag');

// Write the child nodes of the array in a loop

foreach(string s in theArray )

{

//Write the specified opening tag and associate it with the given namespace and prefix

xmlw.WriteStartElement('x', 'element', null);

//Put S Convert it into a byte[] array, and encode the byte[] array into Base64 and write the result text. The number of bytes to be written is twice the total length of s. The number of bytes occupied by a string is 2 bytes.

xmlw.WriteBase64(Encoding.Unicode.GetBytes(s), 0, s.Length*2);

//Closed child node

xmlw.WriteEndElement();

}

//Closed root node, There are only two levels

xmlw.WriteEndDocument();



// Close writer

xmlw.Close();



// Read out the written content

XmlTextReader reader = new XmlTextReader(filname);

while(reader.Read())

{

//Get 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 ));

}

}

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