free pdf417 barcode generator c# Figure 11-8. Example output from the PTWebService test web page in C#.NET

Creation PDF 417 in C#.NET Figure 11-8. Example output from the PTWebService test web page

Figure 11-8. Example output from the PTWebService test web page
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If you then click one of the links for a web method, you ll get details about that method. For instance, clicking the GetResourceList() method brings up a display similar to the one in Figure 11-9.
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CHAPTER 11 s WEB SERVICES INTERFACE
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Figure 11-9. WSDL for the GetResourceList web method
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With simple web methods, this display includes the ability to invoke the method from within the browser. For example, Figure 11-10 shows the result of clicking the Invoke button to execute the GetResourceList() web method.
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CHAPTER 11 s WEB SERVICES INTERFACE
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Figure 11-10. Results of invoking the GetResourceList method
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Your results may vary, of course, depending on the data in your database.
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To further illustrate how to call PTWebService, and in particular to show how you deal with the custom SOAP header for authentication, the ProjectTracker solution contains a PTServiceClient project. This is a bare-bones smart client application that acts as a consumer for PTWebService. Figure 11-11 shows what the application looks like when running.
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CHAPTER 11 s WEB SERVICES INTERFACE
Figure 11-11. The PTWebService client application
My goal with this application isn t to create a complete consumer. I want to use this application to show how to consume a basic web service, and how to set up and pass credentials through the custom SOAP header. As shown in Figure 11-12, PTServiceClient has a web reference to PTService.
Figure 11-12. Web reference to PTService
CHAPTER 11 s WEB SERVICES INTERFACE
The URL behavior for this reference is set to Dynamic in the Properties window. This means that the URL for the web service is maintained in the app.config file: <applicationSettings> <PTServiceClient.Properties.Settings> <setting name="PTServiceClient_PTService_PTService" serializeAs="String"> <value> http://localhost/PTWebServicecs/PTService.asmx </value> </setting> </PTServiceClient.Properties.Settings> </applicationSettings> The <applicationSettings> element is part of the configuration functionality provided by System.Configuration in .NET 2.0, and it is automatically used by Visual Studio when you set the URL behavior property to Dynamic for a web reference. When you add a web reference to your project, Visual Studio uses the WSDL description for the web service to determine all the types it exposes; including CslaCredentials, ProjectData, and the other types accepted as parameters or returned as results from the web methods. Visual Studio uses this information to create proxy classes for all these types, so they can be used in the consumer code as though they were local classes.
Calling a Web Method
The data binding support in Windows Forms works against the proxy classes generated for a web service. This means you can add a type like ProjectData to the Data Sources window much like Project was added in 9. Figure 11-13 shows the Data Source Configuration Wizard listing all the types from the PTService web reference. When you go to add a data source to the Data Sources window, the first step in the wizard includes the option to add a web service as a data source, as shown in Figure 11-14. While you can use this option, it gets you exactly the same result as if you manually add the web reference and then add the proxy objects as object data sources. In other words, web service proxy objects are always object data sources, regardless of whether you add them using the Web Service or Object options in the Data Source Configuration Wizard. Once the proxy types are in the Data Sources window, you can drag-and-drop them onto a form just like you would with any business object. This is how the PTServiceClient UI was built. For each type you drag onto the form, Visual Studio creates a corresponding BindingSource object in the form s component tray. The UI controls are bound to the BindingSource control, and that BindingSource control is bound to your data. Just like in 9, you need to write a bit of code to set the DataSource property of each BindingSource object. For instance, when the client s form loads, the following code is run: private void MainForm_Load(object sender, EventArgs e) { using (PTService.PTService svc = new PTService.PTService()) { this.ProjectDataBindingSource.DataSource = svc.GetProjectList(); this.ResourceDataBindingSource.DataSource = svc.GetResourceList(); this.RoleDataBindingSource.DataSource = svc.GetRoles(); } }
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