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Figure 12-16. Displaying the results of a query through XML and XSLT Remember that when you interact with your data as XML, all the customary database-oriented concepts such as relationships and unique constraints go out the window. The only reason you should interact with your DataSet as XML is if you need to perform an XML-specific task. You shouldn t use XML manipulation to replace the approaches used in earlier chapters to update data. In most cases, you ll find it easier to use advanced controls such as the GridView, rather than creating a dedicated XSL stylesheet to transform data into the HTML you want to display.

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To execute an XPath expression in .NET, you can use the Select() method of the XPathNavigator or the SelectNodes() or SelectSingleNode() method of the XmlDocument class. The following code uses this technique to retrieve specific information: // Load the XML file. string xmlFile = Server.MapPath("DvdList.xml"); XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Retrieve the title of every science-fiction movie. XmlNodeList nodes = doc.SelectNodes("/DvdList/DVD/Title[../@Category='Science Fiction']"); // Display the titles. StringBuilder str = new StringBuilder(); foreach (XmlNode node in nodes) { str.Append("Found: <b>"); // Show the text contained in this <Title> element. str.Append(node.ChildNodes[0].Value); str.Append("</b><br />"); } lblXml.Text = str.ToString(); Figure 12-5 shows the results.

SQL Server 2000 and later provide built-in support for XML. You can execute any query and return the results as an XML fragment by adding the FOR XML clause to your query. This feature is completely separate from the XML features of the DataSet. However, it gives you another way to retrieve data from one or more tables in a database and work with it as XML.

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Reading an XML file with an XmlTextReader object is the simplest approach, but it also provides the least flexibility. The file is read in sequential order, and you can t freely move to the parent, child, and sibling nodes as you can with XmlDocument and XPathNavigator. Instead, you read a node at a time from a stream. For this reason, the code is in a single nonrecursive method, which is more straightforward. It also makes it easy to scan through an entire XML document until you find the node that interests you. The following code starts by loading the source file in an XmlTextReader object. It then begins a loop that moves through the document one node at time. To move from one node to the next, you call the XmlTextReader.Read() method. This method returns true until it moves past the last node, at which point it returns false. This is similar to the approach used by the DataReader class, which retrieves query results from a database.

Here s the code you need: private void ReadXML() { string xmlFile = Server.MapPath("DvdList.xml"); // Create the reader. XmlTextReader reader = new XmlTextReader(xmlFile); StringBuilder str = new StringBuilder(); // Loop through all the nodes. while (reader.Read()) { switch(reader.NodeType) { case XmlNodeType.XmlDeclaration: str.Append("XML Declaration: <b>"); str.Append(reader.Name); str.Append(" "); str.Append(reader.Value); str.Append("</b><br />"); break; case XmlNodeType.Element: str.Append("Element: <b>"); str.Append(reader.Name); str.Append("</b><br />"); break; case XmlNodeType.Text: str.Append(" - Value: <b>"); str.Append(reader.Value); str.Append("</b><br />"); break; } ... After handling the types of nodes you re interested in, the next step is to check if the current node has attributes. The XmlTextReader doesn t have an Attributes collection, but an AttributeCount property returns the number of attributes. You can continue moving the cursor forward to the next attribute until MoveToNextAttribute() returns false. ... if (reader.AttributeCount > 0) { while(reader.MoveToNextAttribute()) { str.Append(" - Attribute: <b>"); str.Append(reader.Name); str.Append("</b> Value: <b>"); str.Append(reader.Value); str.Append("</b><br />"); } } } // Close the reader and show the text. reader.Close(); lblXml.Text = str.ToString(); }

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