DuplexClientBase<TChannel> Classe

Definição

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)

Parâmetros de Tipo Genérico

Herança

Object

ClientBase<TChannel>

DuplexClientBase<TChannel>

Exemplos

O exemplo seguinte mostra a utilização, no cliente, de um tipo de cliente WCF duplex, o SampleDuplexHelloClient, para passar um novo System.ServiceModel.InstanceContext objeto com o objeto de callback para ouvir 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

Observações

Use a DuplexClientBase<TChannel> classe para criar um canal para um serviço que especifique um objeto de callback. O DuplexClientBase<TChannel> objeto envolve um System.ServiceModel.DuplexChannelFactory<TChannel> objeto, que fornece a conectividade para o objeto WCF. Pode usar qualquer um dos tipos para se ligar a um serviço duplex. Para mais informações sobre serviços de duplex, consulte Serviços de Duplex.

Nota especial para utilizadores de C++ gerido derivados desta classe:

• Coloca o teu código de limpeza em (On)(Begin)Close (e/ou OnAbort), não num destrutor.
• Evite destruidores: eles fazem com que o compilador gere IDisposableautomaticamente .
• Evite membros que não sejam de referência: podem fazer com que o compilador gere IDisposableautomaticamente .
• Evite finalizadores; mas se incluir um, deve suprimir o aviso de compilação e a chamada SuppressFinalize(Object) e o próprio finalizador de (On)(Begin)Close (e/ou OnAbort) para emular o que teria sido o comportamento gerado IDisposable automaticamente.