creating barcode vb.net Consuming Services in Visual C#.NET

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Consuming Services
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public GreetingServiceProxy(InstanceContext inputInstance) : base(inputInstance, new NetTcpBinding(), new EndpointAddress("net.tcp://localhost:6789/service")) { } public void RequestGreeting(string name) { this.Channel.RequestGreeting(name); } }
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4. In the same file, below the proxy class, define a GreetingServiceAgent class that wraps an instance of the proxy class you just defined. This agent class also sets up the instancing context for the proxy in its constructor, and it implements the Callback contract. The class should be as follows:
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' VB Public Class GreetingServiceAgent Implements IGreetingService, IGreetingHandler, IDisposable Public Sub New() Try ' Set up instance context and pass it to proxy: Dim context As New InstanceContext(Me) _proxy = New GreetingServiceProxy(context) _proxy.Open() Catch ex As Exception _proxy = Nothing End Try End Sub Public Sub RequestGreeting(ByVal name As String) _ Implements IGreetingService.RequestGreeting If Not _proxy Is Nothing Then _proxy.RequestGreeting(name) End If End Sub Public Sub GreetingProduced(ByVal greeting As String) _ Implements IGreetingHandler.GreetingProduced Console.WriteLine( _ "Called back with greeting: {0}", greeting) End Sub Public Sub Dispose() Implements IDisposable.Dispose If Not _proxy Is Nothing Then _proxy.Close() End If End Sub Private _proxy As GreetingServiceProxy
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Lesson 1: Consuming WCF Services
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End Class // C# class GreetingServiceAgent : IGreetingService, IGreetingHandler, IDisposable { public GreetingServiceAgent() { try { // Set up instance context and pass it to proxy: InstanceContext context = new InstanceContext(this); _proxy = new GreetingServiceProxy(context); _proxy.Open(); } catch { _proxy = null; } } public void Dispose() { if (_proxy != null) _proxy.Close(); } public void RequestGreeting(string name) { if (_proxy != null) _proxy.RequestGreeting(name); } public void GreetingProduced(string greeting) { Console.WriteLine( "Called back with greeting: {0}", greeting); } private GreetingServiceProxy _proxy; }
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5. In the same file, in the try block of the Main method of the Program class, write the following code to call the agent:
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' VB Dim agent As New GreetingServiceAgent agent.RequestGreeting("Sally") // C# GreetingServiceAgent agent = new GreetingServiceAgent(); agent.RequestGreeting("Sally");
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Consuming Services
For the sake of completeness, here is the Program class listing in its entirety:
' VB Public Class Program Public Shared Sub Main() Dim t As Thread t = New Thread(New ThreadStart( _ AddressOf Program.RunService)) t.Start() autoEvent.WaitOne() Try Dim agent As New GreetingServiceAgent agent.RequestGreeting("Sally") Catch ex As Exception Console.WriteLine("Error: {0}", ex.Message) End Try End Sub Public Shared Sub RunService() Dim host As ServiceHost host = New ServiceHost(GetType(GreetingService)) host.AddServiceEndpoint(GetType(IGreetingService), _ New NetTcpBinding(), "net.tcp://localhost:6789/service") host.Open() autoEvent.Set() Console.WriteLine("Press Enter to exit ) Console.ReadLine() End Sub Public Shared autoEvent As AutoResetEvent = New AutoResetEvent(False) End Class // C# class Program { static void Main(string[] args) { new Thread(new ThreadStart(RunService)).Start(); autoEvent.WaitOne(); try { GreetingServiceAgent agent = new GreetingServiceAgent(); agent.RequestGreeting("Sally"); } catch (Exception ex)
Lesson 1: Consuming WCF Services
{ Console.WriteLine("Error: {0}", ex.Message); } } static void RunService() { ServiceHost host = new ServiceHost(typeof(GreetingService)); host.AddServiceEndpoint(typeof(IGreetingService), new NetTcpBinding(), "net.tcp://localhost:6789/service"); host.Open(); autoEvent.Set(); Console.WriteLine("Press Enter to exit"); Console.ReadLine(); } static AutoResetEvent autoEvent = new AutoResetEvent(false); }
6. Build and run the application. You should see that both the service and the callback object, which in this case is your agent instance, are successfully called.
Lesson Summary
Both the command-line utility svcutil and Visual Studio can be used to generate proxy classes from a service s metadata, whose instances can be used as proxies to a service. Proxy classes can be manually defined by inheriting from the ClientBase class or from the DuplexClientBase class for proxies that need a callback channel. Proxy objects can be generated dynamically using the ChannelFactory class based only on the Service contract. Method calls on proxy objects are translated into messages sent to a remote service by the WCF client-side plumbing either synchronously or asynchronously. Asynchronous method calls use the Begin- and End- method pairs in tandem.
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 1, Consuming WCF Services. The questions are also available on the companion CD if you prefer to review them in electronic form.
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