訪問服務器變量時出現異常

我創建了一個RESTful WCF 4.0服務。爲了捕獲和記錄未處理的異常，我創建了一個錯誤處理程序，我希望爲了記錄目的而收集服務器變量。然而，訪問HttpContext.Current.Request.ServerVariables拋出一個「值沒有在預期範圍內」的異常：訪問服務器變量時出現異常

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

    public void ApplyDispatchBehavior(ServiceDescription serviceDescription, System.ServiceModel.ServiceHostBase serviceHostBase) 
    { 
     IErrorHandler errorHandler = new VirusInfoErrorHandler(); 

     foreach (ChannelDispatcherBase channelDispatcherBase in serviceHostBase.ChannelDispatchers) 
     { 
      ChannelDispatcher channelDispatcher = channelDispatcherBase as ChannelDispatcher; 

      if (channelDispatcher != null) 
      { 
       channelDispatcher.ErrorHandlers.Add(errorHandler); 
      } 
     } 
    } 

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

    public bool HandleError(Exception error) 
    { 
     // I'd like to log here but accessing 
     // HttpContext.Current.Request.ServerVariables 
     // throws a "Value does not fall within the expected range" exception. 

     return true; 
    } 

    public void ProvideFault(Exception error, MessageVersion version, ref Message fault) 
    { 
    } 
}

我的配置如下：

<system.serviceModel> 
    <behaviors> 
    <endpointBehaviors> 
     <behavior name="Rest"> 
     <webHttp /> 
     </behavior> 
    </endpointBehaviors> 
    <serviceBehaviors> 
     <behavior> 
     <serviceDebug includeExceptionDetailInFaults="False" httpHelpPageEnabled="False" /> 
     <serviceAuthorization serviceAuthorizationManagerType="ACME.MyAuthorizationManager, ACME.Authorization" /> 
     <errorHandler /> 
     </behavior> 
    </serviceBehaviors> 
    </behaviors> 
    <extensions> 
    <behaviorExtensions> 
     <add name ="errorHandler" type="ACME.MyErrorHandlerElement, ACME.MyErrorHandler"/> 
    </behaviorExtensions> 
    </extensions> 
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" /> 
    <standardEndpoints> 
    <webHttpEndpoint> 
     <standardEndpoint name="" faultExceptionEnabled="true" helpEnabled="true" automaticFormatSelectionEnabled="true" /> 
    </webHttpEndpoint> 
    </standardEndpoints> 
    <bindings> 
    <basicHttpBinding> 
     <binding name="BasicHttpBinding_IAppAccess" closeTimeout="00:01:00" 
      openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" 
      allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" 
      maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" 
      messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" 
      useDefaultWebProxy="true"> 
     <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> 
     <security mode="None"> 
      <transport clientCredentialType="None" proxyCredentialType="None" realm="" /> 
      <message clientCredentialType="UserName" algorithmSuite="Default" /> 
     </security> 
     </binding> 
    </basicHttpBinding> 
    </bindings> 
</system.serviceModel>

服務類和方法：

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)] 
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Multiple)] 
public class MyService 
{ 
    [WebGet(UriTemplate="/my-method", ResponseFormat=WebMessageFormat.Json)] 
    public Message MyMethod() 
    { 
     // might return good things 
     // might throw an exception in downstream tiers 
    } 
}

是否沒有辦法從WCF的上下文中檢索服務器變量？

來源

2012-02-16 Bullines

爲什麼要檢索這些「變量」？在任何情況下它們都不存在。相反，看看你可以從各種上下文對象中獲得什麼。 – 2012-02-17 01:08:47

當你說「他們在任何情況下都不存在」時，你能解釋一下嗎？我關心的是檢索請求者的IP地址和服務器名稱等內容。這可能來自WebOperationContext嗎？我沒有看到從IErrorHander的方式。 – Bullines 2012-02-17 01:14:43

「服務器變量」是Web服務器發明的一種小說，它使腳本語言更容易訪問這些信息。有些地方沒有一套真正的變數。簡單的研究表明，你可以從'ProvideFault'中訪問'OperationContext'。 – 2012-02-17 01:39:39

您的服務類是否標有以下屬性？

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]

來源

2012-02-17 01:03:45

是的。我編輯了我的問題。 – Bullines 2012-02-17 01:04:33

訪問服務器變量時出現異常

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