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Now that you have a web service and proxy class, it s quite easy to develop a simple web-page client If you re using Visual Studio, the first step is to create a new web project and add a web reference to the web service If you re using another tool, you ll need to compile a proxy class first using wsdlexe and then place it in the new web application Bin directory The following example uses a simple web page with a button and a GridView control When the user clicks the button, the web page posts back, creates the proxy class, retrieves the DataSet of employees from the web service, and then displays the result by binding it to the grid Before you add this code, it helps to import the proxy class namespace.

One other option for decorators is to provide a single decorator that can function in both of the previous situations: with arguments and without. This is more complex but worth exploring. The goal is to allow the decorator to be called with or without arguments so it s safe to assume that all arguments are optional; any decorator with required arguments can t use this technique. With that in mind, the basic idea is to add an extra optional argument at the beginning of the list, which will receive the function to be decorated. Then, the decorator structure includes the necessary logic to determine whether it s being called to add arguments or to decorate the target function.

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In Visual Studio, the namespace is automatically the namespace of the current project, plus the namespace you specified in the Add Web Reference dialog box (which is localhost by default) Assuming your project is named WebClient, the web service is on the local computer, and you didn t make any changes in the Add Web Reference dialog box, you ll use this namespace: using WebClientlocalhost; Now you can add the code that uses the proxy class to retrieve the data: private void cmdGetData_Click(object sender, SystemEventArgs e) { // Create the proxy EmployeesService proxy = new EmployeesService(); // Call the web service and get the results DataSet ds = proxyGetEmployees(); // Bind the results GridView1DataSource = dsTables[0]; GridView1.

DataBind(); } Because the proxy class has the same name as the web service class, when the client instantiates the proxy class it seems as though the client is actually instantiating the web service To help emphasize the difference, this code names the object variable proxy If you run the page, you ll see the page shown in Figure 32-11 Interestingly, you don t need to perform the data binding manually You can use the ObjectDataSource (described in 9) to bind directly to the corresponding proxy class, no code required: <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetEmployees" TypeName="localhostEmployeesService" /> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="True" DataSourceID="ObjectDataSource1"/> From the point of view of your web-page code, there s no difference between calling a web service and using an ordinary stateless class.

However, you must remember that the web service that actually implements the business logic could be on a web server on the other side of the world As a result, you need to reduce the number of times you call it and be prepared to handle exceptions resulting from network problems and connectivity errors..

This requires that all arguments passed to the decorator be passed as keyword arguments, which generally makes for more readable code. One downside is how much boilerplate would have to be repeated for each decorator that uses this approach. Thankfully, like most boilerplate in Python, it s possible to factor it out into a reusable form, so new decorators can be defined more easily, using yet another decorator. The following function can be used to decorate other functions, providing all the functionality necessary to accept arguments or it can be used without them.

The proxy class includes a Timeout property that allows you to specify the maximum amount of time you re willing to wait, in milliseconds. By default, the timeout is 100,000 milliseconds (10 seconds). When using the Timeout property, you need to include error handling. If the Timeout period expires without a response, an exception will be thrown, giving you the chance to notify the user about the problem. Here s how you could rewrite the ASP .NET web-page client to use a timeout of three seconds: private void cmdGetData_Click(object sender, System.EventArgs e) { // Create the proxy. EmployeesService proxy = new EmployeesService(); // This timeout will apply to all web service method calls. proxy.Timeout = 3000; // 3,000 milliseconds is 3 seconds. DataSet ds = null; try { // Call the web service and get the results. ds = proxy.GetEmployees(); } catch (System.Net.WebException err) { if (err.Status == WebExceptionStatus.Timeout) { lblResult.Text = "Web service timed out after 3 seconds."; } else

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