creating barcode vb.net Configuring WCF in C#.NET

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Configuring WCF
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// C# NetTcpBinding binding = new NetTcpBinding(); host.AddServiceEndpoint(typeof(IGetHeaders), binding, "net.tcp://localhost:8240/DemoService");
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6. Build the project by choosing the Build DemoService item from the Build menu. 7. Using Windows Explorer, navigate to the just created executable at <InstallHome>/ 5/Lesson2/Exercise1/<language>/Before/bin/debug. 8. Double-click DemoService.exe. (It s possible, if you are running antivirus software, that you might be prompted to allow the executable to run. If so, take whatever action is required to allow the application to run.) A command window will appear, indicating that the host is running. 9. In Visual Studio 2008, ensure that the TestClient project is set as the startup project, then launch the client application by pressing F5. Because TestClient has been marked as the startup project, the client will execute. A message will appear in the command window, indicating that the header is called GetHeaders. This indicates that the service host has been successfully defined and executed imperatively. 10. Press Enter in the Test Client command window. 11. Press Enter in the Demo Service command window. Exercise 2 Add Multiple Endpoints Creating a single service that supports multiple endpoints and bindings simultaneously is only slightly more challenging than creating a service that exposes a single endpoint. 1. Navigate to the <InstallHome>/5/Lesson2/Exercise2/<language>/Before directory and double-click the Exercise2.sln file to open the solution in Visual Studio. The solution consists of two projects: The DemoService project, a WCF service library that implements the IGetHeaders interface. This interface consists of a single method (GetHeaders) that retrieves some information about the headers in the message sent to the service. For this exercise, it returns the Action header. You implement a second interface, ICalculate, as part of this exercise. The TestClient project, a console application that enables you to consume the DemoService service. A proxy to the DemoService has already been created. 2. In Solution Explorer, double-click the HeaderService file. The project already has an ICalculate interface defined. (It consists of a single method called Sum.) This method will be implemented in the HeaderService class. 3. In the class declaration for HeaderService, indicate that the class implements the ICalculate interface. Change the class declaration to look like the following.
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Lesson 2: Dynamic Service Configuration
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' VB Public Class HeaderService Implements IGetHeaders, ICalculate // C# public class HeaderService : IGetHeaders, ICalculate
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4. Implement the ICalculate interface. This requires that a Sum method be added. The method takes an array of doubles and returns a double. Add the following code to the HeaderService class.
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' VB Public Function Sum(values As Double()) As Double _ Implements ICalculate.Sum Dim result As double Dim value As double For Each value in values result += value Next Return result End Function // C# public double Sum(double[] values) { double result = 0.0; foreach (double value in values) result += value; return result; }
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Now that ICalculate has been implemented, you must add to the service the endpoint through which it can be accessed. 5. In Solution Explorer, double-click the Program.cs or Module1.vb file in the DemoService project. 6. Below the existing code that adds a service endpoint, add another call to the AddServiceEndpoint method. This call adds the endpoint for the ICalculate methods, as shown here:
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' VB host.AddServiceEndpoint(GetType(ICalculate), binding, _ "net.tcp://localhost:8240/DemoService") // C# host.AddServiceEndpoint(typeof(ICalculate), binding, "net.tcp://localhost:8240/DemoService");
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7. To demonstrate this new endpoint, you must make some changes to the TestClient project. Start by double-clicking the app.config file in the TestClient project within Solution Explorer.
5
Configuring WCF
8. In the bindings section, you must add a new binding for wsHttpBinding. Add the following XML segment to the netTcpBinding section.
<binding name="TcpICalculate" />
The binding that you just added includes a reference to an endpoint with a name of TcpICalculate. You must add this endpoint to the client element within the app.config file. 9. Add the following element to the client element.
<endpoint address="net.tcp://localhost:8240/DemoService" binding="netTcpBinding" bindingConfiguration="TcpICalculate" contract="DemoService.ICalculate" name="TcpICalculate" />
Finally (at least for TestClient), you must modify the console application to make the call to the Sum method found in ICalculate. 10. In Solution Explorer, double-click the Program.cs or Module1.vb file. In the Main method, add the following code below the current call to Console.WriteLine.
' VB Dim calcProxy As DemoService.CalculateClient = _ New DemoService.CalculateClient("TcpICalculate") Console.WriteLine("And the sum is: " + _ calcProxy.Sum(New double() { 1.4, 3.5, 7.8 }).ToString()) // C# DemoService.CalculateClient calcProxy = new DemoService.CalculateClient("TcpICalculate"); Console.WriteLine("And the sum is: " + calcProxy.Sum(new double[] { 1.4, 3.5, 7.8 }));
11. Build the project by right-clicking the DemoService project in Solution Explorer and selecting Build. 12. Using Windows Explorer, navigate to the newly created executable. It can be found at <InstallHome>/5/Lesson2/Exercise2/<language>/Before/bin/debug. 13. Double-click DemoService.exe. As mentioned in Exercise 1, it s possible, if you are running antivirus software, that you might be prompted to allow the executable to run. If so, take whatever action is required.) A command window will appear indicating that the host is running. 14. In Visual Studio 2008, ensure that TestClient is set as the startup project, then launch the client application by pressing F5. A message will appear in the Console window, indicating that the header is called GetHeaders, and the sum of array of doubles passed to the Sum method displays. This indicates that the service host has been successfully defined and executed imperatively. Figure 5-7 shows the expected results in the Console window.
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