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Visual Studio offers you a convenient way to create clients for web services via a facility called web references. When adding a web reference, you point the IDE s Add Web Reference dialog box at the WSDL document for the web service, and Visual Studio will create a proxy class that talks to the service on your behalf (you saw this process in 2).

public void processAction( ActionRequest actionRequest, ActionResponse actionResponse) throws PortletException, IOException { //check for parameters String title = actionRequest.getParameter("title"); if (title != null) { actionResponse.setRenderParameter("title", title); } String contents = actionRequest.getParameter("contents"); if (contents != null) { actionResponse.setRenderParameter("contents", contents); } }

Listing 12-6. Retrieving the List of Employees private void Form1_Load(object sender, EventArgs e) { EmployeeClient.ServiceReference1.EmployeeServiceClient proxy = new EmployeeClient.ServiceReference1.EmployeeServiceClient ("BasicHttpBinding_IEmployeeService"); DataSet ds = proxy.GetEmployees(); listBox1.DataSource = ds.Tables[0].DefaultView; listBox1.DisplayMember = "FirstName"; listBox1.ValueMember = "EmployeeID"; proxy.Close(); } The code creates a new instance of the proxy class. Notice how the proxy class is named XXXXClient (EmployeeServiceClient in our case) where XXXX is the name of the original service class. In the constructor of the proxy class, you pass the desired endpoint configuration name. You can figure out the endpoint configuration name from client s application configuration file. The code then calls the GetEmployees() method on the proxy object and binds the returned DataSet with the ListBox control. Finally, the underlying communication channel is closed by calling the Close() method of the proxy. When a user clicks any of the employees listed in the ListBox, details of that employee are to be displayed in the Label controls. This is done in the Click event handler of the ListBox (Listing 12-7). Listing 12-7. Retrieving the Details of an Employee private void listBox1_Click(object sender, EventArgs e) { EmployeeClient.ServiceReference1.EmployeeServiceClient proxy = new EmployeeClient.ServiceReference1.EmployeeServiceClient( "BasicHttpBinding_IEmployeeService" ); Employee emp = proxy.GetEmployee(int.Parse(listBox1.SelectedValue.ToString())); label5.Text = emp.EmployeeID.ToString(); label6.Text = emp.FirstName; label7.Text = emp.LastName; proxy.Close(); } The code is very similar to what you saw earlier. This time it calls the GetEmployee() method on the proxy by passing the selected EmployeeID. The GetEmployee() method returns an instance of the Employee class filled with the required details. The details such as EmployeeID, FirstName, and LastName are then displayed in respective labels.

In order to add a web reference, and therefore use the underlying web service, the first thing you ll need is the WSDL for your web service. You can get this by appending WSDL to the URL of your service if it is an ASP.NET web service (the mechanism for other services varies and is beyond the scope of this chapter to describe). For example, if your service s endpoint is located at http://url/Service.asmx, you can get the WSDL by using the URL http://url/Service.asmx WSDL. Knowing this, you can create a client web site, a Windows application, or another web service to easily consume this service. From your project, right-click the project name in the Solution Explorer and select Add Web Reference. You ll see the Add Web Reference dialog box, as in Figure 5-13. Use the URL field to enter the URL of the WSDL file, and then click Go.

This method should be called only from the Submit button on the edit page, but we need to check to see that the parameters we expect are in the ActionRequest object. If a parameter does not exist, when we ask the ActionRequest object for that missing parameter, we will get a return value of null. If we get a non-null value for a parameter, we are going to set a render parameter with the same name as the action parameter on the ActionResponse object. This allows us to maintain state. In more complicated portlets, we would do additional work based on the

2

Once the IDE parses the WSDL, the list of methods will be displayed, and the web reference name will be given a default value. It s a good idea to change this name to something more meaningful before you click Add Reference.

Now that you have coded all three parts (service, host, and client), let s test them. First, compile all the projects from the solution. Then run the host console application. If everything goes well, you should see a command prompt like the one shown in Figure 12-5.