c# - 客户端不会捕获通用 FaultException< T >，只会捕获 FaultException

Question

我已经阅读了关于此的所有内容，但也许我遗漏了一些东西(好吧，我肯定遗漏了一些东西，否则它已经可以工作了)

我在我的服务器业务层中抛出了一些异常错误:

public class RfcException :  Exception
{
   public RfcException(string _m, Exception _inner) : base(_m, _inner)
   { }

   public Dictionary<string, string> ExtendedProperties
   {
      get { return extendedProperties; }
      protected set { extendedProperties = value; }
   }

   private Dictionary<string, string> extendedProperties = new Dictionary<string, string>();
}

我在服务中没有处理，但我有一个 IErrorHandler捕捉并创造一个FaultMessage :

public class FaultErrorHandler : BehaviorExtensionElement, IErrorHandler, IServiceBehavior
{
   public bool HandleError(Exception error)
   {
      if (!Logger.IsLoggingEnabled()) return true;
      var logEntry = new LogEntry
        {
           EventId = 100,
           Severity = TraceEventType.Error,
           Priority = 1,
           Title = "WCF Failure",
           Message = string.Format("Error occurred: {0}", error)
        };
      logEntry.Categories.Add("MiddleTier");

      Logger.Write(logEntry);
      return true;
   }

   public void ProvideFault(Exception error, System.ServiceModel.Channels.MessageVersion version, ref System.ServiceModel.Channels.Message fault)
   {
      if (error is RfcException)
      {
         RfcException rfcException = error as RfcException;
         var serviceFault = new RfcServiceFault(rfcException);
         var faultException = new FaultException<RfcServiceFault>(serviceFault, new FaultReason(string.Format("System error occurred, exception: {0}", error)));
         var faultMessage = faultException.CreateMessageFault();
         fault = Message.CreateMessage(version, faultMessage, Schema.WebServiceStandard);
      }
      else
      {
         var faultException = new FaultException<Exception>(error, new FaultReason(string.Format("System error occurred, exception: {0}", error)));
         var faultMessage = faultException.CreateMessageFault();
         fault = Message.CreateMessage(version, faultMessage, Schema.WebServiceStandard);
      }
   }

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

   public void ApplyDispatchBehavior(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
   {
      foreach (ChannelDispatcher chanDisp in serviceHostBase.ChannelDispatchers)
      {
         chanDisp.ErrorHandlers.Add(this);
      };
   }

   public void Validate(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase)
   { }

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

   protected override object CreateBehavior()
   {
      return new FaultErrorHandler();
   }
}

不用问；我已经通过调试器确认它进入了 if (error is RfcException) 部分部分，我已经逐步完成了该代码，并且毫无问题地到达了最后。errorHandler 包装了一个 FaultException<RfcServiceFault>消息，RfcServiceFault消息是这样的

[DataContract(Name = "RfcServiceFault", Namespace = "Service.DataTransfer.Rfc")]
public class RfcServiceFault 
{
   public RfcServiceFault(RfcException rfcException) : this( (Exception)rfcException )
   {
      ExtendedProperties = new Dictionary<string, string>(rfcException.ExtendedProperties);
   }

   public RfcServiceFault()
   { }

   public RfcServiceFault(Exception regularException)
   {
      FaultMessage = regularException.Message;
      StackTrace = regularException.StackTrace;
   }

   public Dictionary<string, string> ExtendedProperties
   {
      get { return extendedProperties; }
      protected set { extendedProperties = value; }
   }

   [DataMember]
   private Dictionary<string, string> extendedProperties = new Dictionary<string, string>();

   [DataMember]
   public string FaultMessage { get; set; }

   [DataMember]
   public string StackTrace { get; set; }
}

该服务具有所有应该具有带有故障契约(Contract)的 wcf 服务的注释:

[ServiceContract(Name = "MyService", Namespace = Schema.WebServiceStandard, SessionMode = SessionMode.Allowed)]
public interface IMyService 
{
    [OperationContract(Name = "GetStuff")]
    [FaultContract(typeof(RfcServiceFault) , Name="RfcServiceFault", Namespace="Service.DataTransfer.Rfc")]
    LookupResult GetStuff();
}

现在:在客户端测试，像这样的简单测试:

try
{
   var result = myService.GetStuff();
   Assert.IsTrue(!string.IsNullOrEmpty(result));
}
catch (FaultException<RfcServiceFault> rfcEx)
{
   // OMG FOR THE LIFE OF THE PUPPIES ENTER HERE
}
catch (FaultException rr)
{
   // it always falls in here
}
catch (Exception ex)
{ }

我读过很多很多关于这个类似问题的帖子:

• Cannot handle FaultException
• Throwing generic FaultException
• c# WCF catch Fault Exceptions of Base type
• WCF: WSDL-first approach: Problems with generating fault types

但到目前为止似乎没有任何帮助，我已经尝试在 web.config 中设置 WCF 跟踪:

<system.diagnostics>
    <sources>
      <source name="System.ServiceModel"
              switchValue="Information, ActivityTracing">
        <listeners>
          <add name="log"
               type="System.Diagnostics.XmlWriterTraceListener"
               initializeData="c:\Traces.svclog" />
        </listeners>
      </source>
    </sources>
  </system.diagnostics>

我在那里得到一个 svclog 文件，我用 WCF Trace 查看器打开，但我只看到一堆消息，黄色的显示异常，但它只确认客户端已经看到的内容，System.ServiceModel.FaultException正在接收，而不是通用的

有什么办法解决这个问题吗？

编辑 忘了说，我在配置中启用了我的错误处理程序，如下所示:

<behaviorExtensions>
   .....
    <add name="faultErrorHandlerBehavior" 
         type="Service.FaultErrorHandler,Service, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
    .....
</behaviorExtensions>
<serviceBehaviors>
   <behavior name="ServiceBehavior">
       <serviceThrottling maxConcurrentCalls="200" maxConcurrentSessions="200"
                          maxConcurrentInstances="200" />
       <serviceMetadata httpGetEnabled="true" />
       <serviceDebug includeExceptionDetailInFaults="true" />
       <faultErrorHandlerBehavior />
    </behavior>
</serviceBehaviors>

Answer 1

(这有点摸不着头脑)我相信您可能遇到了问题，因为对故障的操作与客户端的预期不符。您能否将您的 CreateMessage 替换为以下内容:

fault = Message.CreateMessage(version, faultMessage, faultException.Action);