Hi Jonathan,

You can use XmlTextReader and XmlTextWriter. They're very fast. You can
programmatically delete the old file if you don't want to keep two large
files.

To start you can read through some documentations here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
frlrfsystemxmlxmltextwriterclasstopic.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
frlrfsystemxmlxmltextreaderclassnodetypetopic.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
frlrfsystemxmlxmltextwriterclasstopic.asp

The following are some sample code:

//reader the Large Xml file using XmlTextReader
XmlTextReader reader = new XmlTextReader(@"C:\Test\LargeXmlFile.xml");

//XmlTextWriter to write Large XML File
XmlTextWriter cdocWriter =  new
XmlTextWriter(@"C:\Test\LargeXmlFile_New.xml", Encoding.UTF8);

writer.Formatting = Formatting.Indented;

writer.WriteStartDocument();

// Read the file and display each of the nodes.
while (reader.Read())
{
    switch (reader.NodeType)
    {
        case XmlNodeType.Element:
            writer.WriteStartElement(reader.Name);
            writer.WriteAttributes(reader,false);
            if (reader.IsEmptyElement)
                writer.WriteEndElement();
                break;
            //You can have some test statement here to append nodes
            if (reader.Name == "????")
            {
                //TODO: do something
            }
        case XmlNodeType.Text:
            writer.WriteString(reader.Value);
                break;
        case XmlNodeType.Whitespace:
        case XmlNodeType.SignificantWhitespace:
                writer.WriteWhitespace(reader.Value);
                break;
        case XmlNodeType.CDATA:
                writer.WriteCData(reader.Value);
                break;
        case XmlNodeType.Comment:
                writer.WriteComment(reader.Value);
                break;
        case XmlNodeType.EntityReference:
                writer.WriteEntityRef(reader.Name);
                break;
        case XmlNodeType.EndElement:
            //You can have some test statement here to append nodes
            if (reader.Name == "????")
            {
                //TODO: do something
            }

                writer.WriteEndElement();
                break;
        }
}

writer.WriteEndDocument();
writer.Flush();
writer.Close();
reader.Close();

Hope this helps!
--
Yingzi Le
LongHorn SDK Team

This posting is provided "AS IS" with no warranties, and confers no rights.

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