CommunicationException Klass

Definition

public ref class CommunicationException : Exception

public ref class CommunicationException : SystemException

public class CommunicationException : Exception

[System.Serializable]
public class CommunicationException : SystemException

type CommunicationException = class
    inherit Exception

[<System.Serializable>]
type CommunicationException = class
    inherit SystemException

Public Class CommunicationException
Inherits Exception

Public Class CommunicationException
Inherits SystemException

Arv

Object

Exception

CommunicationException

Arv

Object

Exception

SystemException

CommunicationException

Härledda

System.ServiceModel.ActionNotSupportedException

System.ServiceModel.AddressAccessDeniedException

System.ServiceModel.AddressAlreadyInUseException

System.ServiceModel.Channels.RedirectionException

System.ServiceModel.Channels.RetryException

Mer…

Attribut

SerializableAttribute

Exempel

I följande kodexempel visas en klient som hanterar CommunicationException typer. Den här klienten hanterar FaultException också objekt eftersom tjänsten har IncludeExceptionDetailInFaults angetts till true.

using System;
using System.ServiceModel;
using System.ServiceModel.Channels;
using Microsoft.WCF.Documentation;

public class Client
{
  public static void Main()
  {
    // Picks up configuration from the configuration file.
    SampleServiceClient wcfClient = new SampleServiceClient();
    try
    {
      // Making calls.
      Console.WriteLine("Enter the greeting to send: ");
      string greeting = Console.ReadLine();
      Console.WriteLine("The service responded: " + wcfClient.SampleMethod(greeting));
      Console.WriteLine("Press ENTER to exit:");
      Console.ReadLine();
    }
    catch (TimeoutException timeProblem)
    {
      Console.WriteLine("The service operation timed out. " + timeProblem.Message);
      wcfClient.Abort();
      Console.ReadLine();
    }
    // Catch the contractually specified SOAP fault raised here as an exception.
    catch (FaultException<GreetingFault> greetingFault)
    {
      Console.WriteLine(greetingFault.Detail.Message);
      Console.Read();
      wcfClient.Abort();
    }
    // Catch unrecognized faults. This handler receives exceptions thrown by WCF
    // services when ServiceDebugBehavior.IncludeExceptionDetailInFaults
    // is set to true.
    catch (FaultException faultEx)
    {
      Console.WriteLine("An unknown exception was received. "
        + faultEx.Message
        + faultEx.StackTrace
      );
      Console.Read();
      wcfClient.Abort();
    }
    // Standard communication fault handler.
    catch (CommunicationException commProblem)
    {
      Console.WriteLine("There was a communication problem. " + commProblem.Message + commProblem.StackTrace);
      Console.Read();
      wcfClient.Abort();
    }
  }
}

Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports Microsoft.WCF.Documentation

Public Class Client
  Public Shared Sub Main()
    ' Picks up configuration from the configuration file.
    Dim wcfClient As New SampleServiceClient()
    Try
      ' Making calls.
      Console.WriteLine("Enter the greeting to send: ")
      Dim greeting As String = Console.ReadLine()
      Console.WriteLine("The service responded: " & wcfClient.SampleMethod(greeting))
      Console.WriteLine("Press ENTER to exit:")
      Console.ReadLine()
    Catch timeProblem As TimeoutException
      Console.WriteLine("The service operation timed out. " & timeProblem.Message)
      wcfClient.Abort()
      Console.ReadLine()
    ' Catch the contractually specified SOAP fault raised here as an exception.
    Catch greetingFault As FaultException(Of GreetingFault)
      Console.WriteLine(greetingFault.Detail.Message)
      Console.Read()
      wcfClient.Abort()
    ' Catch unrecognized faults. This handler receives exceptions thrown by WCF
    ' services when ServiceDebugBehavior.IncludeExceptionDetailInFaults 
    ' is set to true.
    Catch faultEx As FaultException
      Console.WriteLine("An unknown exception was received. " & faultEx.Message + faultEx.StackTrace)
      Console.Read()
      wcfClient.Abort()
    ' Standard communication fault handler.
    Catch commProblem As CommunicationException
      Console.WriteLine("There was a communication problem. " & commProblem.Message + commProblem.StackTrace)
      Console.Read()
      wcfClient.Abort()
    End Try
  End Sub
End Class

Kommentarer

Robusta program för klient- och tjänst Windows Communication Foundation (WCF) hanterar CommunicationException objekt som kan utlösas under kommunikationen. Det finns också två CommunicationException-härledda undantagstyper (FaultException<TDetail> och FaultException) som klienter också ofta förväntar sig. För att förhindra att den generiska CommunicationException hanteraren fångar dessa mer specifika undantagstyper kan du därför fånga dessa undantag innan du hanterar CommunicationException.

• FaultException<TDetail> objekt utlöses på klienten när ett SOAP-fel som anges i åtgärdskontraktet tas emot som svar på en tvåvägsåtgärd (d.s. en metod med ett OperationContractAttribute attribut med IsOneWay värdet false).

FaultException objekt utlöses när en lyssnare får ett SOAP-fel som inte förväntas eller anges i åtgärdskontraktet. Detta inträffar vanligtvis när programmet debuggas och tjänsten har IncludeExceptionDetailInFaults egenskapen inställd på true.

Mer information om hur du utformar och använder WCF-felsystemet finns i Ange och hantera fel i Kontrakt och tjänster.