c# - EndpointDispatcher 的 ContractFilter 不匹配(错误处理)

Question

更新我的 WCF 客户端的服务引用时(只需在 Visual Studio 2008 中单击更新服务引用)，出现以下错误:

System.ServiceModel.FaultException: The message with Action 'http://schemas.xmlsoap.org/ws/2004/09/transfer/Get' cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None). at System.ServiceModel.Dispatcher.ErrorBehavior.ThrowAndCatch(Exception e, Message message)

背景:

我已经创建了 ErrorServiceBehaviour 类。由于此类行为是为错误处理而创建的，因此必须将 IErrorHandler 实现应用于每个 ChannelDispatcher。

public class ErrorServiceBehaviour : Attribute, IServiceBehavior
{
   ...
   public Type FaultType
   {
      get { return _faultType; }
      set { _faultType = value; }
   }

   public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
   {
       foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
       {
           dispatcher.ErrorHandlers.Add(new ErrorHandler(_faultType));
       }
   }
}

public class ErrorHandler : IErrorHandler
{
     public ErrorHandler(Type faultType)
     {
        _faultType = faultType;         
     }
     ...
}

后来，我通过将 ErrorServiceBehavior 属性应用于我的服务类来使用该行为:

[ErrorServiceBehavior(FaultType = typeof(MyServiceFault))] 
public class MyService : IMyService
{
   ...
}

问题是，当我在 ApplyDispatchBehavior 方法中注释掉 foreach 循环时，我根本没有得到no 错误，但事实并非如此出路(因为我希望我的错误得到处理)。

下面是我的服务配置:

<system.serviceModel>
    <services>
        <service behaviorConfiguration="DefaultBehavior" name="MyService">
            <endpoint address="" binding="wsHttpBinding" contract="IMyService" bindingConfiguration="NoSecurityBinding"/>
            <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
        </service>
    </services>
    <behaviors>
        <serviceBehaviors>
            <behavior name="DefaultBehavior">
                <serviceMetadata httpGetEnabled="true" />
                <serviceDebug includeExceptionDetailInFaults="true" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
    <bindings>
        <wsHttpBinding>
            <binding name="NoSecurityBinding" >
                <security mode="None">
                    <transport clientCredentialType="None"/>
                    <message establishSecurityContext="false"/>
                </security>
            </binding>
            <binding name="DefaultBinding" />
        </wsHttpBinding>
    </bindings>
</system.serviceModel>

有人可以帮助我吗？

更新

前面显示的代码:

foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
{
    dispatcher.ErrorHandlers.Add(new ErrorHandler(_faultType));
}

为所有端点添加自定义错误处理 - 包括元数据端点。但实际上这不是问题的根源 - 即使我禁用为元数据端点添加错误处理，问题仍然存在。

另一个注意事项是，当我将第一个端点的 bindingConfiguration 更改为 DefaultBinding 时，我完全没有错误:

<services>
    <service behaviorConfiguration="DefaultBehavior" name="MyService">
        <endpoint address="" binding="wsHttpBinding" contract="IMyService" bindingConfiguration="DefaultBinding"/>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
    </service>
</services>

这样的选项也不是我想要的 - 我仍然需要有问题的 NoSecurityBinding 才能工作。

提前致谢。

Answer 1

查看 IExtensibleDataObject ，它用于处理仍然能够相互通信的不同版本的 Web 服务。这样契约(Contract)就不需要完全匹配。希望这会有所帮助。