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In addition to Select() and SelectSingleNode(), you can also use three specialized methods: The SelectChildren() method accepts the name of the child node and returns an XPathNodeIterator containing all the child nodes of the current node matching the supplied name. The SelectAncestors() method accepts the name of the ancestor nodes to select and returns an XPathNodeIterator containing all the ancestor nodes of the current node. The SelectDescendants() method accepts a node name and returns an XPathNodeIterator containing all the descendant nodes of the current node matching the supplied name. These methods are optimized for performance and hence are faster than the equivalent XPath expressions.

Returns the value of an attribute when given a name, or null. Calls getAttribute() on the portlet s PortletRequest object. Returns the names of the available attributes. Calls getAttributeNames() on the portlet s PortletRequest object. Returns the authentication scheme used. Calls getAuthType() on the portlet s PortletRequest object. Returns null; does nothing. Always returns 0. Returns null; does nothing. Returns the context path associated with the portlet application on the portal. Calls getContextPath() on the portlet s PortletRequest object. Returns cookies from properties on the portlet request. Returns a date header from properties on the portlet request. Returns header from properties on the portlet request. Returns header names from properties on the portlet request. Returns headers from properties on the portlet request. Returns null; does nothing. Returns an integer header from properties on the portlet request. Returns preferred locale for the portal. Calls getLocale() on the portlet s PortletRequest object. Returns locales accepted by the portal. Calls getLocales() on the portlet s PortletRequest object. Returns GET . Returns the value of the parameter from either the portlet request, or from the query string passed into the request dispatcher. The query string takes precedence.

Now, in the Page_Load event handler, add this code:

getAttributeNames()

If you are using the same XPath expression again and again, you can improve the performance of your code by using the Compile() method of the XPathNavigator class. This method accepts an XPath expression as a string, compiles it, and returns an instance of the XPathExpression class. This instance can then be supplied to the Select() and SelectSingleNode() methods. To see the Compile() method in action, you need to modify the example that we developed for selecting nodes (see the Selecting Nodes section). The modified code is given in Listing 4-5. Listing 4-5. Using XPathExpression and the Compile() Method private void button1_Click(object sender, EventArgs e) { XPathDocument doc = new XPathDocument(Application.StartupPath + @"\employees.xml"); XPathNavigator navigator = doc.CreateNavigator(); XPathExpression expression = navigator.Compile(textBox1.Text); XPathNodeIterator iterator = navigator.Select(expression); try { ... Note the lines marked in bold. The code creates an instance of the XPathExpression class by calling the Compile() method of XPathNavigator. This XPathExpression instance is then passed to the Select() method. The rest of the code of the application remains unchanged. You can pass the same XPathExpression instance to any number of Select() or SelectSingleNode() calls.

getAuthType()

protected void Page_Load(object sender, EventArgs e) { int nX = 0; int nY = 0; try { nX = Convert.ToInt16(Request.Params["nx"]); nY = Convert.ToInt16(Request.Params["ny"]); } catch (Exception ex) { nX = 0; nY = 0; } int nAns = nX * nY; Response.Write(nAns); }

getCharacterEncoding() getContentLength() getContentType() getContextPath()