Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

StringBuilder sb = new StringBuilder("");foreach(XmlNode n in nodes)sb.Append(n.OuterXml);sb.Append("");return sb.ToString();Our sample application intentionally follows a more sophisticated approach to displayformatted output in the text box. In addition, this code turns out to be a useful exercisefor understanding the logic of XML writers.If you want to generate XML output in the .NET Framework, unless the text is short andstraightforward, you have no good reason for not using XML writers. Using XML writersalso provides automatic and free indentation. Don't think that choosing an XML writerties you to using a specific output stream. As the following code demonstrates, theoutput of an XML writer can be easily redirected to a string:string BuildOutputString(XmlNodeList nodes){// Create a string writer to hold the XML text. Forefficiency,// the string writer is based on a StringBuilder object.StringBuilder sb = new StringBuilder("");StringWriter sw = new StringWriter(sb);// Instantiate the XML writerXmlTextWriter writer = new XmlTextWriter(sw);writer.Formatting = Formatting.Indented;// Write the first element (No WriteStartDocument call isneeded)writer.WriteStartElement("results");// Loop through the children of each selected node and// recursively output attributes and textforeach(XmlNode n in nodes)LoopThroughChildren(writer, n);// Complete pending nodes and then close the writerwriter.WriteEndElement();writer.Close();}// Flush the contents accumulated in the string writerreturn sw.ToString();Let's see what happens when we process the following XML document:212