WCF REST的ServiceBehavior

Question

我在为WCF服务配置ServiceBehavior时遇到问题.

一些背景.基本上我正在开发一个应该在IIS上运行的REST服务WCF.我需要能够记录服务抛出的异常(我正在使用log4net)并根据异常类型返回HTTP状态代码.我希望我的服务实现对WCF相关的东西知之甚少,所以我不想在服务的每个地方将异常转换为FaultException.所以我发现将自己的IErrorHandler添加到服务主机是最好的方法.

我的问题是,无论我尝试什么,我似乎无法在Web.config中获得我的自定义ServiceBehavior的配置.这是相关的代码.

网络配置.

<system.webServer>
  <modules runAllManagedModulesForAllRequests="true">
    <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
  </modules>
</system.webServer>

<system.serviceModel>
  <behaviors>
    <serviceBehaviors>
      <behavior name="UsingErrorLogBehavior">
        <errorLogBehavior/>
      </behavior>
    </serviceBehaviors>
    <endpointBehaviors>
      <behavior>
        <webHttp/>
      </behavior>
    </endpointBehaviors>
  </behaviors>
  <extensions>
    <behaviorExtensions>
      <add name="errorLogBehavior"
           type="MyNameSpace.Web.ErrorExtensionElement, MyNameSpace.Web"/>
    </behaviorExtensions>
  </extensions>
  <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
  <standardEndpoints>
    <webHttpEndpoint>
      <standardEndpoint name="" helpEnabled="true" 
                        automaticFormatSelectionEnabled="false" 
                        defaultOutgoingResponseFormat="Json" 
                        maxReceivedMessageSize="4194304" transferMode="Buffered" />
    </webHttpEndpoint>
  </standardEndpoints>
</system.serviceModel>

ErrorExtensionElement.

namespace MyNameSpace.Web
{
    public class ErrorExtensionElement : BehaviorExtensionElement
    {
        public override Type BehaviorType
        {
            get { return typeof(ErrorServiceBehavior); }
        }

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

ErrorServiceBehavior.

namespace MyNameSpace.Web
{
    public class ErrorServiceBehavior : IServiceBehavior
    {
        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 channelDispatcher in serviceHostBase.ChannelDispatchers)
            {
                channelDispatcher.ErrorHandlers.Add(new ExceptionModule());
            }
        }

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

ExceptionModule实现IErrorHandler的位置.

Answer 1

您有一个<serviceBehavior>名为“UsingErrorLogBehavior”的部分，但没有服务配置引用该部分。您可以将该部分设置为默认服务行为（通过不为其指定名称，就像端点行为一样），或者<service>为引用该行为的服务添加一个元素：

<services>
  <service name="YourNamespace.YourServiceName"
           behaviorConfiguration="UsingErrorLogBehavior">
    <endpoint address=""
              binding="webHttpBinding"
              contract="YourNamespace.YourContractName" />
  </service>
</services>