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Embedded XAML reference: XAML can also be embedded within a <script> tag within your HTML. Should you use this approach, you will need to name the tag, and then set the Source property of the Silverlight control to this value, prefixed with #.

3

LINQ to XML provides easy ways for adding, removing, and changing the content of an XML tree. These ways can be best seen with an example. Let s create an application like the one shown in Figure 13-8 that represents a data entry screen for the Employees.xml file.

out.write("This portlet has been rendered " + renderCounter + " times (including this one)<br>"); out.write("This portlet has received " + actionCounter + " action requests<br>"); PortletURL action = response.createActionURL (); out.write("Click <a href=\""); out.write(action.toString()); out.write("\">here</a> to trigger an action.<br>"); }

Using Embedded XAML Here s an example of a <script> tag that contains XAML:

Because our sample portlet does not need to tailor its view to the different users of the system, it is able to ignore the request parameter, which contains the user-specific (session) state information. It does, however, need to render its current state to the browser, and must specify the type of content that it will produce. Our sample portlet demonstrates an important relationship between the portlet and the portal: one portlet can be rendered multiple times on a single page. If an instance of the portlet is placed in a portal page in two distinct places, the portlet will be loaded once, rendered multiple times (twice each time the portal page as a whole is rendered), and destroyed once. The last few lines of this example method are of particular interest, since they demonstrate how to provide a mechanism by which actions (and thus calls by the container to processAction()) can be rendered:

Figure 13-8. Data entry screen for the Employees.xml file The application displays <employee> elements from the Employees.xml file. You can navigate among various employees using the VCR controls provided at the bottom. You can also jump to an employee with a specific employee ID using the combo box. The Add, Update, and Delete buttons add, change, or remove an <employee> element from the underlying XML tree, respectively. The Save button saves the modified XML tree back to the Employees.xml file.

<script type="text/xaml" id="xamlContent"> < xml version="1.0" > <Canvas xmlns="http://schemas.microsoft.com/client/2007" Background="Wheat"> <TextBlock Canvas.Left="20" FontSize="24">Hello World</TextBlock> </Canvas> </script>

PortletURL action = response.createActionURL ();

When the application starts, it loads the Employees.xml file into an instance of the XElement class. This is done in the Load event of the form (see Listing 13-11). Listing 13-11. Loading an XML Document XElement doc = null; private void Form1_Load(object sender, EventArgs e) { doc=XElement.Load(Application.StartupPath + @"\employees.xml"); var result=from item in doc.Descendants("employee") select item.Attribute("employeeid").Value;

As you can see, this script block has been called xamlContent. Thus, when initializing the Silverlight control, you would set its source to #xamlContent, like this:

This retrieves an object from the response object provided in the parameters of the render() method, which can render a URL representing a specific action. Our example has only one type of action, but methods such as addParameter() can be called on the PortletURL object to differentiate between calls to the various actions that you want to implement. Again, PortletURL is an interface, and it is the responsibility of the container to provide a suitable implementation. It is not appropriate to hardcode a URL into your portlet since the precise details of the mappings between URLs and portlets are configurable by the administrator of the portal. In addition, portlet URLs distinguish between different instances of a portlet running inside of a portlet. The portlet URLs are usually prefixed with a namespace or another unique ID. These details will be specific to the portal in which your portlet is running, so if you want to make your portlet compatible between portals (and even between versions of the same portal) you should always rely on the createActionURL() method.