IErrorHandler 似乎没有处理我在 WCF 中的错误.. 有什么想法吗? [英] IErrorHandler doesn't seem to be handling my errors in WCF .. any ideas?

问题描述

一直在阅读 IErrorHandler 并想走配置路线.因此，我已阅读以下内容以尝试实施它.

Have been reading around on IErrorHandler and want to go the config route. so, I have read the following in an attempt to implement it.

MSDN

关于类型定义的 Keyvan Nayyeri 博客

Rory Primrose 博客

这基本上只是封装在继承 IErrorHandler 和 IServiceBehaviour 的类中的 msdn 示例……然后将其封装在继承自 BehaviourExtensionElement 的 Extension 元素中，据称允许我将该元素添加到 web.config 中.我错过了什么?

This is basically just the msdn example wrapped in a class that inherits IErrorHandler and IServiceBehaviour ... then this is wrapped in the Extension element that inherits from BehaviourExtensionElement to allegedly allow me to add the element into the web.config. What have i missed?

我已经编译了它，并且从我修复的各种错误来看，WCF 似乎实际上正在加载错误处理程序.我的问题是我在错误处理程序中抛出的异常没有得到传递给它的异常.

I have got it to compile and from the various errors i have fixed it seems like WCF is actually loading the error handler. My problem is that the exception that i am throwing to handle in the error handler doesn;t get the exception passed to it.

我的服务实现只是调用另一个类上的方法，该方法抛出 ArgumentOutOfRangeException - 但是处理程序永远不会处理此异常.

My service implementation simply calls a method on another class that throws ArgumentOutOfRangeException - however this exception never gets handled by the handler.

我的 web.config

My web.config

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="basic">
          <security mode="None" />                      
        </binding>
      </basicHttpBinding>
    </bindings>
    <extensions>
      <behaviorExtensions>
        <add name="customHttpBehavior"
             type="ErrorHandlerTest.ErrorHandlerElement, ErrorHandlerTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
      </behaviorExtensions>
    </extensions>
    <behaviors>
      <serviceBehaviors>
        <behavior name="exceptionHandlerBehaviour">          
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="true"/>
          <customHttpBehavior />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service behaviorConfiguration="exceptionHandlerBehaviour" name="ErrorHandlerTest.Service1">
        <endpoint binding="basicHttpBinding" bindingConfiguration="basic" contract="ErrorHandlerTest.IService1" />
      </service>
    </services>

服务合同

[ServiceContract]
public interface IService1
{
    [OperationContract]
    [FaultContract(typeof(GeneralInternalFault))]
    string GetData(int value);
}

ErrorHandler 类

The ErrorHandler class

public class ErrorHandler : IErrorHandler , IServiceBehavior 
{
    public bool HandleError(Exception error)
    {
        Console.WriteLine("caught exception {0}:",error.Message );
        return true;
    }

    public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
    {
       if (fault!=null )
       {
           if (error is ArgumentOutOfRangeException )
           {
               var fe = new FaultException<GeneralInternalFault>(new GeneralInternalFault("general internal fault."));
               MessageFault mf = fe.CreateMessageFault();

               fault = Message.CreateMessage(version, mf, fe.Action);

           }
           else
           {
               var fe = new FaultException<GeneralInternalFault>(new GeneralInternalFault(" the other general internal fault."));
               MessageFault mf = fe.CreateMessageFault();

               fault = Message.CreateMessage(version, mf, fe.Action);
           }
       }
    }

    public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
    {

    }

    public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        IErrorHandler errorHandler = new ErrorHandler();
        foreach (ChannelDispatcherBase channelDispatcherBase in serviceHostBase.ChannelDispatchers)
        {
            ChannelDispatcher channelDispatcher = channelDispatcherBase as ChannelDispatcher;
            if (channelDispatcher != null)
            {
                channelDispatcher.ErrorHandlers.Add(errorHandler);
            }
        }
    }


    public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {


    }
}

和行为扩展元素

    public class ErrorHandlerElement : BehaviorExtensionElement 
    {
        protected override object CreateBehavior()
        {
            return new ErrorHandler();
        }

        public override Type BehaviorType
        {
            get { return typeof(ErrorHandler); }
        }
    }

推荐答案

这是一个完整的工作示例:

Here's a full working example:

[ServiceContract]
public interface IService1
{
    [OperationContract]
    [FaultContract(typeof(MyFault))]
    string GetData(int value);
}

[DataContract]
public class MyFault
{

}

public class Service1 : IService1
{
    public string GetData(int value)
    {
        throw new Exception("error");
    }
}

public class MyErrorHandler : IErrorHandler
{
    public bool HandleError(Exception error)
    {
        return true;
    }

    public void ProvideFault(Exception error, MessageVersion version, ref Message msg)
    {
        var vfc = new MyFault();
        var fe = new FaultException<MyFault>(vfc);
        var fault = fe.CreateMessageFault();
        msg = Message.CreateMessage(version, fault, "http://ns");
    }
}

public class ErrorHandlerExtension : BehaviorExtensionElement, IServiceBehavior
{
    public override Type BehaviorType
    {
        get { return GetType(); }
    }

    protected override object CreateBehavior()
    {
        return this;
    }

    private IErrorHandler GetInstance()
    {
        return new MyErrorHandler();
    }

    void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
    {
    }

    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");
                }
            }
        }
    }
}

和 web.config:

and web.config:

<system.serviceModel>
  <services>
    <service name="ToDD.Service1">
      <endpoint address=""
                binding="basicHttpBinding"
                contract="ToDD.IService1" />
    </service>
  </services>

  <behaviors>
    <serviceBehaviors>
      <behavior>
        <serviceMetadata httpGetEnabled="true"/>
        <serviceDebug includeExceptionDetailInFaults="false"/>
        <errorHandler />
      </behavior>
    </serviceBehaviors>
  </behaviors>
  <extensions>
    <behaviorExtensions>
      <add name="errorHandler"
            type="ToDD.ErrorHandlerExtension, ToDD, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
    </behaviorExtensions>
  </extensions>

</system.serviceModel>

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