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We start by extending the GenericPortlet class, just like we did for our other portlets. This portlet has an init() method that we use to configure the location of the Lucene index. When the user first calls the portlet, we display the SearchForm.jsp page in the portlet. After the user sends a search, we process the action and also display SearchResults.jsp. We use a Lucene JSP tag library to execute the query and display the results in the portlet.

private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { textBox2Text= datasource[listBox1SelectedIndex]Value; } The code declares two class-level variables: root and datasource The root variable is of type XElement and holds a pointer to the root node of Employeesxml The datasource variable is an array of type XElement and is used for data binding The Employeesxml file is loaded into the root variable in the Load event of the form The main job of searching a tag name happens in the Click event handler of the Search button Notice the LINQ query shown in bold It uses the Descendents() method of the XElement class The Descendents() method has two overloads: one that doesn t take any parameters and one that takes an element name as the parameter.

The init() method on the SearchPortlet class is basic. We check the portlet s PortletConfig configuration for an initialization parameter named indexPath. If this initialization parameter does not exist, we throw an UnavailableException with an informative error.

These lines configure how your ASP.NET application will deal with specific errors. In this case, if the user attempts to access something on your web site they shouldn t, ASP .NET (and IIS) will display a You don t have access to that resource error page. If the resource simply isn t found, it will display a File not found error page. These pages come as part of ASP .NET, but feel free to provide your own. Just replace the page file names you see here with the page file names of the pages you create, and ASP.NET will use your pages. You can add other error pages as well, following the same model. Just add the HTTP error code in the statusCode attribute and the page file name in the redirect attribute, as shown here. Note also that you should ensure that the <compilation> setting in Web.config is set to turn off debugging, like this:

public void init(PortletConfig config) throws PortletException { super.init(config); //get the location of the Lucene index from the //indexPath initialization parameter indexPath = config.getInitParameter("indexPath"); if (indexPath == null) { //this portlet requires this parameter String errMsg = "The init parameter indexPath must be set."; throw new UnavailableException(errMsg); } //set Lucene lockdir because java.io.tmpdir may not exist in Pluto System.setProperty("org.apache.lucene.lockdir", indexPath); }

The former overload returns all the descendent elements of the current node, whereas the latter overload returns all the descendent elements that match the specified tag name If the CheckBox is unchecked (ie, we want to display all occurrences of the specified tag), then we convert the result into an array of XElement objects using the ToArray() method Otherwise we create an array of XElements manually and store the first occurrence of the element in it Notice the use of the First() method to retrieve just the first instance of the element The datasource variable is then bound with the ListBox In order to display the actual value of the element, the code handles the SelectedIndexChanged event of the ListBox Inside it simply retrieves the selected XElement from the datasource array and displays its Value property in the TextBox To test the application, run it from Visual Studio.

Once the Web.config file is ready, you then use the Copy Web Site tool on the Web Sites menu to access the deployment tool (see Figure 6-18). At the top of the screen, you ll see a Connect button. Click this to specify the server that you want to connect to. One helpful feature is that if you specify an IIS server and a URL containing a subdirectory, IIS will automatically create the virtual web directory for you. So for example, if you want to deploy the web service to a virtual web directory called ServiceTier, you simply add it to the URL of the server you want to open and then click New Web Site (see Figure 6-19).

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