CallbackBehaviorAttribute Construtor
Definição
Inicializa uma nova instância da classe CallbackBehaviorAttribute.Initializes a new instance of the CallbackBehaviorAttribute class.
public:
CallbackBehaviorAttribute();
public CallbackBehaviorAttribute ();
Public Sub New ()
Exemplos
O exemplo de código a seguir mostra um CallbackBehaviorAttribute em um objeto de retorno de chamada que usa o SynchronizationContext objeto para determinar a qual thread realizar marshaling, a ValidateMustUnderstand propriedade para impor a validação de mensagem e a IncludeExceptionDetailInFaults propriedade para retornar exceções como FaultException objetos para o serviço para fins de depuração.The following code example shows a CallbackBehaviorAttribute on a callback object that uses the SynchronizationContext object to determine which thread to marshal to, the ValidateMustUnderstand property to enforce message validation, and the IncludeExceptionDetailInFaults property to return exceptions as FaultException objects to the service for debugging purposes.
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
Comentários
As configurações padrão para o CallbackBehaviorAttribute são:The default settings for the CallbackBehaviorAttribute are:
A propriedade AutomaticSessionShutdown é
true.The AutomaticSessionShutdown property istrue.O ConcurrencyMode é definido como Single.The ConcurrencyMode is set to Single.
A propriedade IgnoreExtensionDataObject é
false.The IgnoreExtensionDataObject property isfalse.IncludeExceptionDetailInFaults é
false.IncludeExceptionDetailInFaults isfalse.UseSynchronizationContext é
false.UseSynchronizationContext isfalse.A propriedade ValidateMustUnderstand é
true.The ValidateMustUnderstand property istrue.