Question

我使用这两篇文章作为实现IErrorHandler的参考：

（我正在使用.net Framework 3.5。）

但是，我遇到了一些麻烦 - 每当我尝试启动该服务时，都会出现以下错误：

System.Configuration.ConfigurationErrorsException：无法将行为扩展“errorHandlerExtension”添加到名为“Test.TestService.Service1Behavior”的服务行为中，因为基础行为类型未实现IServiceBehavior接口。

以下是我的代码和配置文件：

ErrorhandlerExtension.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel.Configuration;
using System.Configuration;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.Collections.ObjectModel;

namespace Test.TestService
{
class ErrorHandlerExtension:BehaviorExtensionElement,IServiceBehavior
{
    public override Type BehaviorType
    {
        get { return typeof(ErrorHandler); }
    }
    protected override object CreateBehavior()
    {
        return new ErrorHandler();
    }
    void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
    {

    }
    private IErrorHandler GetInstance()
    {
        return new ErrorHandler();
    }
    void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        IErrorHandler errorHandlerInstance = GetInstance();
        foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
        {
            dispatcher.ErrorHandlers.Add(errorHandlerInstance);
        }
    }

    void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        foreach (ServiceEndpoint endpoint in serviceDescription.Endpoints)
        {
            if (endpoint.Contract.Name.Equals("IMetadataExchange") &&
                endpoint.Contract.Namespace.Equals("http://schemas.microsoft.com/2006/04/mex"))
                continue;

            foreach (OperationDescription description in endpoint.Contract.Operations)
            {
                if (description.Faults.Count == 0)
                {
                    throw new InvalidOperationException("FaultContractAttribute not found on this method");
                }
            }
        }
    }

}

}

web.config：

<system.serviceModel>  
  <extensions>
      <behaviorExtensions>
        <add name="errorHandlerExtension"
          type="Test.TestService.ErrorHandlerExtension, Test.TestService, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
      </behaviorExtensions>
    </extensions>

    <behaviors>
      <serviceBehaviors>
        <behavior name="Test.TestService.Service1Behavior">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
          <errorHandlerExtension />
       </behavior>
     </serviceBehaviors>
    </behaviors>
</system.serviceModel>

每当我摆脱errorHandlerExtension / element时，服务工作正常，但只要我包含errorHandlerExtension元素（带错误），它就无法启动。我是WCF的新手并且非常难过。有什么想法吗？

编辑：添加 ErrorHandler.cs ：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
using System.Collections.ObjectModel;

namespace Test.TestService
{
public class ErrorHandler:IErrorHandler
{

    public bool HandleError(Exception error)
    {

        LogError("UnhandledError: "+ error);
        return true;
    }

    public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
    {
        FaultException faultException = new FaultException("Exception message:ProvideFault");
        MessageFault messageFault = faultException.CreateMessageFault();
        fault = Message.CreateMessage(version, messageFault, faultException.Action);
    }

}
}

Answer 1

就像我上面所说的，在ErrorHandler中实现IServiceBehavior而不是ErrorHandlerExtension解决了这个问题。

Answer 2

我遇到了完全相同的问题。原来我犯了一个复制+粘贴错误。如果BehaviorType返回typeof(ErrorHandlerExtension)，而CreateBehavior返回new ErrorHandlerExtension()，也可以解决您的问题，就像我的问题一样

实现IErrorHandler时出错 - 无法添加行为扩展

2 个答案: