Framework 1.1, I have an existing complex XML document. I need to add
some namespace information to certain elements. Can anyone illustrate
how to use and XmlTextReader and XmlTextWriter to add custom namespace
info where I want it?

Thanks.

Hi Lucius,

Nice to see you and how are you doing?

Regarding on the question about add namespace into certain element in XML 
document, here are some of my understanding and suggestion:

** If it possible to use XML Document? If so, you can simply load the xml 
document into memory and add the namespace as an xmlattribute onto the 
certain element. e.g.

=====================
   static void RunDOM()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(@"..\..\data.xml");



            Console.WriteLine(doc.OuterXml);

            XmlElement rootelm = doc.DocumentElement;

            XmlAttribute attr = doc.CreateAttribute("xmlns", "myns", 
"http://www.w3.org/2000/xmlns/");
            attr.Value = "http://mytest.org/testxml";

            rootelm.Attributes.Append(attr);


            Console.WriteLine("\r\n\r\n\r\n\r\n") ;


            Console.WriteLine(doc.OuterXml);

}

this would be simple and convenient and work well as long as the xml 
document is not quite large.



** For xmlreader/ xmlwriter approach, you can first write out xml nodes 
while reading from XmlReader(in a while loop) and do some 
customziation(such as insert attributes) whenever the xmlreader arrive the 
node you want. Here is a test code snippet demonstrate this:

=========================================

         static void RunReaderWriter()
        {
            XmlTextReader xtr = new XmlTextReader(
                new StreamReader(@"..\..\data.xml", Encoding.UTF8)
            );

            XmlTextWriter xtw = new XmlTextWriter("output1.xml", 
Encoding.UTF8);

            while (xtr.Read())
            {


                if (xtr.IsStartElement() && xtr.NodeType == 
XmlNodeType.Element && xtr.LocalName == "PurchaseOrder")
                {
                    Console.WriteLine("here come the 'PurchaseOrder' 
element.");

                    //add new namespace attr
                    xtw.WriteStartElement(xtr.Prefix, xtr.LocalName, 
xtr.NamespaceURI);
                    xtw.WriteAttributeString(
                       "xmlns", "myns", "http://www.w3.org/2000/xmlns/",
                    "http://mytest.org/testxml"
                    );

                    //copy existing attrs
                    xtw.WriteAttributes(xtr, true);

                }
                else
                {


                    xtw.WriteNode(xtr, true);
                } 
            }

            xtr.Close();
            xtw.Close();
        }

=====================================

and below is the test xml document for your reference
=====================================

<?xml version="1.0" encoding="utf-8" ?>
<PurchaseOrder>
  <Number>1001</Number>
  <OrderDate>8/12/01</OrderDate>
  <BillToAddress>
    <Street>101 Main Street</Street>
    <City>Charlotte</City>
    <State>NC</State>
    <ZipCode>28273</ZipCode>
  </BillToAddress>
  <ShipToAddress>
    <Street>101 Main Street</Street>
    <City>Charlotte</City>
    <State>NC</State>
    <ZipCode>28273</ZipCode>
  </ShipToAddress>
  <LineItem Name="Computer Desk" Description="Wood desk for computer"
  SKU="12345A123" Price="499.99" Qty="1" />
</PurchaseOrder>

============================

Hope this helps.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

 

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