DuplexClientBase<TChannel> Class

Definition

Namespace:

System.ServiceModel

Assembly:

System.ServiceModel.Primitives.dll

Package:

System.ServiceModel.Primitives v8.0.0

Used to create a channel to a duplex service and associate that channel with a callback object.

generic <typename TChannel>
 where TChannel : classpublic ref class DuplexClientBase abstract : System::ServiceModel::ClientBase<TChannel>

public abstract class DuplexClientBase<TChannel> : System.ServiceModel.ClientBase<TChannel> where TChannel : class

type DuplexClientBase<'Channel (requires 'Channel : null)> = class
    inherit ClientBase<'Channel (requires 'Channel : null)>

Public MustInherit Class DuplexClientBase(Of TChannel)
Inherits ClientBase(Of TChannel)

Type Parameters

TChannel

The type of the channel to be created.

Inheritance

Object

ClientBase<TChannel>

DuplexClientBase<TChannel>

Examples

The following example shows the use in the client of a duplex WCF client type, the SampleDuplexHelloClient, to pass a new System.ServiceModel.InstanceContext object with the callback object to listen for callbacks.

using System;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Threading;

namespace Microsoft.WCF.Documentation
{
  [CallbackBehaviorAttribute(
   IncludeExceptionDetailInFaults= true,
    UseSynchronizationContext=true,
    ValidateMustUnderstand=true
  )]
  public class Client : SampleDuplexHelloCallback
  {
    AutoResetEvent waitHandle;

    public Client()
    {
      waitHandle = new AutoResetEvent(false);
    }

    public void Run()
    {
      // Picks up configuration from the configuration file.
      SampleDuplexHelloClient wcfClient
        = new SampleDuplexHelloClient(new InstanceContext(this), "WSDualHttpBinding_SampleDuplexHello");
      try
      {
        Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine("Enter a greeting to send and press ENTER: ");
        Console.Write(">>> ");
        Console.ForegroundColor = ConsoleColor.Green;
        string greeting = Console.ReadLine();
        Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine("Called service with: \r\n\t" + greeting);
        wcfClient.Hello(greeting);
        Console.WriteLine("Execution passes service call and moves to the WaitHandle.");
        this.waitHandle.WaitOne();
        Console.ForegroundColor = ConsoleColor.Blue;
        Console.WriteLine("Set was called.");
        Console.Write("Press ");
        Console.ForegroundColor = ConsoleColor.Red;
        Console.Write("ENTER");
        Console.ForegroundColor = ConsoleColor.Blue;
        Console.Write(" to exit...");
        Console.ReadLine();
      }
      catch (TimeoutException timeProblem)
      {
        Console.WriteLine("The service operation timed out. " + timeProblem.Message);
        Console.ReadLine();
      }
      catch (CommunicationException commProblem)
      {
        Console.WriteLine("There was a communication problem. " + commProblem.Message);
        Console.ReadLine();
      }
    }
    public static void Main()
    {
      Client client = new Client();
      client.Run();
    }

    public void Reply(string response)
    {
      Console.WriteLine("Received output.");
      Console.WriteLine("\r\n\t" + response);
      this.waitHandle.Set();
    }
  }
}

Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports System.Threading

Namespace Microsoft.WCF.Documentation
  <CallbackBehaviorAttribute(IncludeExceptionDetailInFaults:= True, UseSynchronizationContext:=True, ValidateMustUnderstand:=True)> _
  Public Class Client
      Implements SampleDuplexHelloCallback
    Private waitHandle As AutoResetEvent

    Public Sub New()
      waitHandle = New AutoResetEvent(False)
    End Sub

    Public Sub Run()
      ' Picks up configuration from the configuration file.
      Dim wcfClient As New SampleDuplexHelloClient(New InstanceContext(Me), "WSDualHttpBinding_SampleDuplexHello")
      Try
        Console.ForegroundColor = ConsoleColor.White
        Console.WriteLine("Enter a greeting to send and press ENTER: ")
        Console.Write(">>> ")
        Console.ForegroundColor = ConsoleColor.Green
        Dim greeting As String = Console.ReadLine()
        Console.ForegroundColor = ConsoleColor.White
        Console.WriteLine("Called service with: " & Constants.vbCrLf & Constants.vbTab & greeting)
        wcfClient.Hello(greeting)
        Console.WriteLine("Execution passes service call and moves to the WaitHandle.")
        Me.waitHandle.WaitOne()
        Console.ForegroundColor = ConsoleColor.Blue
        Console.WriteLine("Set was called.")
        Console.Write("Press ")
        Console.ForegroundColor = ConsoleColor.Red
        Console.Write("ENTER")
        Console.ForegroundColor = ConsoleColor.Blue
        Console.Write(" to exit...")
        Console.ReadLine()
      Catch timeProblem As TimeoutException
        Console.WriteLine("The service operation timed out. " & timeProblem.Message)
        Console.ReadLine()
      Catch commProblem As CommunicationException
        Console.WriteLine("There was a communication problem. " & commProblem.Message)
        Console.ReadLine()
      End Try
    End Sub
    Public Shared Sub Main()
      Dim client As New Client()
      client.Run()
    End Sub

    Public Sub Reply(ByVal response As String) Implements SampleDuplexHelloCallback.Reply
      Console.WriteLine("Received output.")
      Console.WriteLine(Constants.vbCrLf & Constants.vbTab & response)
      Me.waitHandle.Set()
    End Sub
  End Class
End Namespace

Remarks

Use the DuplexClientBase<TChannel> class to create a channel to a service that specifies a callback object. The DuplexClientBase<TChannel> object wraps a System.ServiceModel.DuplexChannelFactory<TChannel> object, which provides the connectivity for the WCF object. You can use either type to connect to a duplex service. For more information about duplex services, see Duplex Services.

Special note for Managed C++ users deriving from this class:

• Put your cleanup code in (On)(Begin)Close (and/or OnAbort), not in a destructor.

• Avoid destructors: they cause the compiler to auto-generate IDisposable

• Avoid non-reference members: they can cause the compiler to auto-generate IDisposable

• Avoid finalizers; but if you include one, you should suppress the build warning and call SuppressFinalize(Object) and the finalizer itself from (On)(Begin)Close (and/or OnAbort) in order to emulate what would have been the auto-generated IDisposable behavior.

Constructors

DuplexClientBase<TChannel>(InstanceContext, Binding, EndpointAddress)	Initializes a new instance of the DuplexClientBase<TChannel> class using the specified callback object, binding, and service endpoint address.
DuplexClientBase<TChannel>(InstanceContext)	Initializes a new instance of the DuplexClientBase<TChannel> class using the specified callback object.

Properties

Channel	Gets the inner channel used to send messages to variously configured service endpoints. (Inherited from ClientBase<TChannel>)
ChannelFactory	Gets the underlying ChannelFactory<TChannel> object. (Inherited from ClientBase<TChannel>)
ClientCredentials	Gets the client credentials used to call an operation. (Inherited from ClientBase<TChannel>)
Endpoint	Gets the target endpoint for the service to which the WCF client can connect. (Inherited from ClientBase<TChannel>)
InnerChannel	Gets the underlying IClientChannel implementation. (Inherited from ClientBase<TChannel>)
State	Gets the current state of the ClientBase<TChannel> object. (Inherited from ClientBase<TChannel>)

Methods

Abort()	Causes the ClientBase<TChannel> object to transition immediately from its current state into the closed state. (Inherited from ClientBase<TChannel>)
Close()	Causes the ClientBase<TChannel> object to transition from its current state into the closed state. (Inherited from ClientBase<TChannel>)
CloseAsync()	(Inherited from ClientBase<TChannel>)
CreateChannel()	Returns a new channel to the service. (Inherited from ClientBase<TChannel>)
DisplayInitializationUI()	Instructs the inner channel to display a user interface if one is required to initialize the channel prior to using it. (Inherited from ClientBase<TChannel>)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetDefaultValueForInitialization<T>()	Replicates the behavior of the default keyword in C#. (Inherited from ClientBase<TChannel>)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
InvokeAsync(ClientBase<TChannel>.BeginOperationDelegate, Object[], ClientBase<TChannel>.EndOperationDelegate, SendOrPostCallback, Object)	Provides support for implementing the event-based asynchronous pattern. For more information about this pattern, see Event-based Asynchronous Pattern Overview. (Inherited from ClientBase<TChannel>)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
Open()	Causes the ClientBase<TChannel> object to transition from the created state into the opened state. (Inherited from ClientBase<TChannel>)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Explicit Interface Implementations

IAsyncDisposable.DisposeAsync()	(Inherited from ClientBase<TChannel>)
ICommunicationObject.BeginClose(AsyncCallback, Object)	Begins an asynchronous operation to close the ClientBase<TChannel>. (Inherited from ClientBase<TChannel>)
ICommunicationObject.BeginClose(TimeSpan, AsyncCallback, Object)	Begins an asynchronous operation to close the ClientBase<TChannel> with a specified timeout. (Inherited from ClientBase<TChannel>)
ICommunicationObject.BeginOpen(AsyncCallback, Object)	Begins an asynchronous operation to open the ClientBase<TChannel> object. (Inherited from ClientBase<TChannel>)
ICommunicationObject.BeginOpen(TimeSpan, AsyncCallback, Object)	Begins an asynchronous operation to open the ClientBase<TChannel> object within a specified interval of time. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Close()	Causes a communication object to transition from its current state into the closed state. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Close(TimeSpan)	Causes the ClientBase<TChannel> object to transition from its current state into the closed state. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Closed	The event handler that is invoked when the ClientBase<TChannel> object has transitioned from its current state to the closed state. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Closing	The event handler that is invoked when the ClientBase<TChannel> object transitions from its current state to the closed state. (Inherited from ClientBase<TChannel>)
ICommunicationObject.EndClose(IAsyncResult)	Completes an asynchronous operation to close the ClientBase<TChannel> object. (Inherited from ClientBase<TChannel>)
ICommunicationObject.EndOpen(IAsyncResult)	Completes an asynchronous operation to open the ClientBase<TChannel> object. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Faulted	The event handler that is invoked when a fault occurs while performing an operation on the ClientBase<TChannel> object. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Open()	Causes a communication object to transition from the created state into the opened state. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Open(TimeSpan)	Causes the ClientBase<TChannel> object to transition from the created state into the opened state within a specified interval of time. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Opened	The event handler that is invoked when the ClientBase<TChannel> object transitions from the created state to the opened state. (Inherited from ClientBase<TChannel>)
ICommunicationObject.Opening	The event handler that is invoked when the ClientBase<TChannel> object transitions from the created state to the opened state. (Inherited from ClientBase<TChannel>)
IDisposable.Dispose()	Explicit implementation of the Dispose() method. (Inherited from ClientBase<TChannel>)