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' VB Imports VSProxy.Tasks Imports System.ServiceModel
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Consuming Services
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// C# using VSProxy.Tasks; using System.ServiceModel;
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6. Define the Main method (Program.Main or Module1.Main as appropriate) so that it matches the following code, which instantiates the proxy class generated by Visual Studio when you added the service reference:
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' VB Sub Main() Dim proxy As TaskManagerServiceClient proxy = New TaskManagerServiceClient() Try Dim task As New Task() task.CreatedBy = "Eric" task.AssignedTo = "Vicki" task.DateCreated = DateTime.Now task.DateLastModified = task.DateCreated task.Description = "Do the laundry" task.DueDate = DateTime.Now.AddDays(3) Dim ack As TaskAcknowledgement ack = proxy.AddTask(task) Dim taskNum As Integer taskNum = ack.TaskNumber Console.WriteLine( _ "Task number {0} added to service", _ taskNum) ' Now try to mark that same task ' as completed: proxy.MarkTaskCompleted(taskNum) Catch fault As FaultException(Of FaultInfo) Console.WriteLine("Error: {0}", fault.Detail.Reason) End Try End Sub // C# static void Main(string[] args) { try { TaskManagerServiceClient proxy = new TaskManagerServiceClient(); Task task = new Task(); task.CreatedBy = "Eric"; task.AssignedTo = "Vicki"; task.DateCreated = DateTime.Now;
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Lesson 1: Consuming WCF Services
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task.DateLastModified = task.DateCreated; task.Description = "Do the laundry"; task.DueDate = DateTime.Now.AddDays(3); TaskAcknowledgement ack = proxy.AddTask(task); int taskNum = ack.TaskNumber; Console.WriteLine( "Task number {0} added to service", taskNum); // Now try to mark that same task // as completed: proxy.MarkTaskCompleted(taskNum); } catch (FaultException<FaultInfo> fault) { Console.WriteLine("Fault: {0}",fault.Detail.Reason); } }
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Usage of faults as part of the Service contract
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This exercise s version of a consumer uses a FaultException<FaultInfo> exception, based on the Service contract s specification that the MarkTaskCompleted operation could issue a fault of type FaultInfo. This code shows how to access the FaultInfo object and its Reason property.
7. Build the solution. 8. Making sure the service is still running and that VSProxy is the startup project, run this Console project. You should see that it successfully submits a task to the service. You might also try modifying the code in step 6 to force an exception. This can be done easily by changing the call to MarkTaskCompleted to take a number for which you know there isn t a valid task, for instance, 111. Finally, you can shut down the Task Manager service. Exercise 4 Consume a Service Using a Duplex, or Callback, Channel 1. 1, in the section titled Duplex, discussed a simple Hello World Service contract and service type that used a Duplex MEP by setting up a callback contract. In this exercise, you will take that as a starting point and build on it to practice going through the steps required to create a proxy that can consume the Greeting service by communicating with it using a two-way duplex (or callback) channel. Following is the code that defines the Service contract, the Callback contract, and the service type in which the Callback contract is accessed and called. You can find this code in the Services (.cs or .vb as appropriate) file when you open the solution for this lab.
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Consuming Services
' VB Imports System.ServiceModel Imports System.ServiceModel.Channels <ServiceContract()> _ Public Interface IGreetingHandler <OperationContract(IsOneWay:=True)> _ Sub GreetingProduced(ByVal greeting As String) End Interface <ServiceContract(CallbackContract:= _ GetType(IGreetingHandler))> _ Public Interface IGreetingService <OperationContract(IsOneWay:=True)> _ Sub RequestGreeting(ByVal name As String) End Interface <ServiceBehavior(InstanceContextMode := _ InstanceContextMode.PerSession)> _ Public Class GreetingService Implements IGreetingService Public Sub RequestGreeting(ByVal name As String) _ Implements IGreetingService.RequestGreeting Console.WriteLine("In GreetingService.RequestGreeting") Dim callbackHandler As IGreetingHandler callbackHandler = _ OperationContext.Current.GetCallbackChannel( _ Of IGreetingHandler)() callbackHandler.GreetingProduced("Hello " + name) End Sub End Class // C# using System.ServiceModel; using System.ServiceModel.Channels; [ServiceContract] interface IGreetingHandler { [OperationContract(IsOneWay = true)] void GreetingProduced(string greeting); } [ServiceContract(CallbackContract = typeof(IGreetingHandler))] interface IGreetingService { [OperationContract(IsOneWay = true)] void RequestGreeting(string name); }
Lesson 1: Consuming WCF Services
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)] class GreetingService : IGreetingService { public void RequestGreeting(string name) { Console.WriteLine("In GreetingService.RequestGreeting"); IGreetingHandler callbackHandler = OperationContext.Current.GetCallbackChannel<IGreetingHandler>(); callbackHandler.GreetingProduced("Hello " + name); } }
In this exercise, you not only create a proxy, but you also use the concept of an agent discussed in this lesson to create a simple agent that wraps the proxy and takes care of the details required both to set up the callback channel and implement the Callback contract. Finally, this lab also uses the technique of manually defining a proxy class to a service. 2. Navigate to the <InstallHome>/4/Lesson1/Exercise4/<language>/Before directory and double-click the Exercise4.sln file to open the solution in Visual Studio. The solution consists of only one project, a Console project in which you define both the client and the service, and you configure the endpoints in code rather than in a configuration file. You wouldn t do this in a production setting, but it is good to see how it s done to simplify code you might use to experiment with WCF. In this case, the focus is on the mechanics of creating a callback proxy, and everything else is simplified. 3. In the Program (.cs or .vb as appropriate) file, manually define a GreetingServiceProxy class (above the Program class) that you ll use to act as the proxy to the service. The class should be as follows:
' VB Public Class GreetingServiceProxy Inherits DuplexClientBase(Of IGreetingService) Implements IGreetingService Public Sub New(ByVal inputInstance As InstanceContext) MyBase.New(inputInstance, New NetTcpBinding(), _ New EndpointAddress("net.tcp://localhost:6789/service")) End Sub Public Sub RequestGreeting(ByVal name As String) _ Implements IGreetingService.RequestGreeting Me.Channel.RequestGreeting(name) End Sub End Class // C# class GreetingServiceProxy : DuplexClientBase<IGreetingService>, IGreetingService {
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