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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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you did earlier, but directly from this window, before adding the reference. If you are making use of a third-party web service, you should ensure that service is functioning as expected before trying to consume it. To complete the addition of the web reference, click the Add Reference button. If you click Show All Files in the Solution Explorer at this point, you ll see the IDE has added several files to the Acudei project.
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6. You will need to pass a PlaceID to the web service. Let s make it configurable by adding a key to the <appSettings> section in the Web.config file: <configuration> <appSettings> <add key="PlaceID" value="11CF70F8-E48E-4bdc-AE1A-5F2277015851" /> </appSettings> 7. Next, import the following namespace on the code-behind page: Imports System.Configuration 8. Now you can start adding code that makes use of the web methods, just as though they were in a built-in class, such as a SqlCommand. The runtime will take care of calling the remote service and handling the data marshaling. This code will be called when the page loads, to fill the blank with the count of Friends Reunion users in the associate institution. Therefore, add the following code fragment to Page_Load(): Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Dim friends = New Acudei.FriendsService.Partners Dim count As Integer = friends.GetAttendees( _ ConfigurationSettings.AppSettings("PlaceID")) txtCount.Text = count.ToString() End Sub
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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9. That completes the implementation of the simple consumer application, so you can save, compile, and run it. In order to run this project, you ll need to set it as the startup project for the solution (by right-clicking on the project and selecting Set as Startup Project, as in previous examples). Next, set the Default.aspx page as the start page. The page should render the count of users for the place entered, as shown in Figure 9-8.
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Figure 9-8. The consumer application
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How It Works When you add a web reference, VS .NET asks for the service WSDL formal description. You looked at such a description earlier, by appending the WSDL parameter to the service URL, in our case, http://localhost/FriendsReunion/Services/Partners.asmx WSDL. With this description at hand, the IDE generates a class to represent this service, with a method for each web method exposed by it, and places it in a namespace that matches the name you used for the web reference. In the Solution Explorer, you can see this WSDL file is actually downloaded and stored as part of the web reference.
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The class generated from this file is located below the Reference.map file. You can dig into it to discover how the remote web service invocation is done when you call the GetAttendees() method.
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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The code in Page_Load() uses this class as any other regular class, initializing an instance of it and calling the method. Notice how the call to this method looks identical to calls to any other regular class method. There s nothing in the code that indicates this is a web service call. You also get a typed result, the integer you are expecting. As mentioned earlier, the so-called proxy class and the .NET runtime deal with the nuts and bolts of passing requests to the service, serializing parameters being passed in to the method, deserializing return values, initiating the connection, and so on. By generating the proxy class at design-time, you get strong typing and IntelliSense right away. Try It Out: Retrieve Contact Requests Now that you ve seen how our GetAttendees() method can be called from within an application, let s extend the consumer application to retrieve the contact requests for users. To do this, you ll need to call the GetContactRequests() method, passing in the user login name and password, and add a DataGrid control to the form in order to present the DataSet of results that are returned. Figure 9-9 shows the layout you ll set up for the Default page.
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