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The next step is to bind the input parameters to the data source. This means that you can codelessly accept input parameters via a text box and use them in the call to the web method. Earlier you added a text box and a button control to the page, and these will be used. Clicking the button triggers the form action, and this contains data from the text box. As a result, you should specify Form as the parameter source, and the text box as the form field that contains the parameter data. The default text box name is TextBox1, so if you didn t change the name of the text box, you would use this name, as shown in Figure 5-17.

It is essentially the same markup that you specified for the console host. The only difference is that the address attribute of the <endpoint> element is an empty string. This is because for an IIS-hosted service, the address is the same as the URI of the .svc file hosting the service. To access the EmployeeService hosted in IIS, the endpoint URL will be http://localhost/ EmployeeServiceHostWeb/EmployeeServicerHost.svc wsdl. Observe that the URL points to the .svc file and contains the wsdl query string parameter. Everything else in the client application remains the same.

If the image is packaged into a portlet application along with the portlet classes and any servlets, JSP files, or style sheets needed, including it in the portlet gets a little more complicated. We cannot just use relative links to static files that could be served up from the portlet application because the portal could be using the URL of the portal page for any purpose it needs the URL on the end user s web browser may not necessarily correspond to the context path of the deployed portlet application. Here is the relevant portion of our doView() method:

Next, finish the wizard, and the ASP.NET code for the ObjectDataSource and form bindings will be generated for you. It should look something like this:

From what you have learned up until now, it is clear that WCF uses XML for configuring various pieces of services. However, there is more to the story. Internally WCF services heavily rely on XML. When a WCF service call is made by a client application, the call is converted into a message, which is represented by a class called Message. Internally, the client request is stored in a special XML format called InfoSet. When the client call is sent to the service, it is serialized in a format decided by the binding. For example, if the client is a non-WCF client, the message is encoded in XML format, whereas if the client is a WCF client, it is represented in an optimized binary format. When the message reaches the service, it is deserialized back into an InfoSet. A Message object is created and then handed over to the service along with the InfoSet. The service then executes the method call and returns the data in a similar fashion.

writer.write( "<IMG SRC=" + renderResponse.encodeURL( renderRequest.getContextPath() + "/images/picture.jpg") + ">");

<form id="form1" runat="server"> <div> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <asp:Button ID="Button1" runat="server" Text="Button" /> <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetAddress" TypeName="AddressData.Service"> <selectparameters> <asp:formparameter DefaultValue="90210" FormField="TextBox1" Name="ZIP" Type="String" /> </selectparameters> </asp:ObjectDataSource> </div> </form>

We will need to ask the portlet request for the context path of the running portlet, which we can use to construct links to the files included in the portlet application. The deployment of the portlet application on the portal determines the portlet application s context path. For example, if the portlet application archive file is called myapp.war, the portal administrator might have assigned the context path to be /myapp when deploying the portlet application on the portal. The portal would refer to the path /myapp to find the portlet application. The getContextPath() method on the PortletRequest interface class is used to obtain the context path to build links: