ELMAH - 異常記錄，而不必HttpContext的

Question

我試圖this溶液Elmah.XmlFileErrorLog，但我發現

<configSections> 
    <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> 
    <section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> 
    <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> 
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
     <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
      <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
      <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
       <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/> 
       <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
       <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
       <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 
      </sectionGroup> 
     </sectionGroup> 
    </sectionGroup> 
    <sectionGroup name="elmah"> 
    <section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah" /> 
    <section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah" /> 
    <section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah" /> 
    <section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler, Elmah" /> 
    </sectionGroup> 
</configSections> 
<httpHandlers> 
    <add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" /> 
    <remove verb="*" path="*.asmx"/> 
    <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
    <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
    <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/> 
</httpHandlers> 
<httpModules> 
    <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
    <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" /> 
</httpModules> 
... 

<elmah> 
    <errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/App_Data" /> 
    <security allowRemoteAccess="1" /> 
</elmah> 

我使用Windows 7以下異常

System.ArgumentNullException was unhandled by user code 
    Message="Value cannot be null.\r\nParameter name: context" 
    Source="Elmah" 
    ParamName="context" 
    StackTrace: 
     at Elmah.ErrorSignal.FromContext(HttpContext context) in c:\builds\ELMAH\src\Elmah\ErrorSignal.cs:line 67 
     at Elmah.ErrorSignal.FromCurrentContext() in c:\builds\ELMAH\src\Elmah\ErrorSignal.cs:line 61 
     at ElmahHttpErrorHandler.ProvideFault(Exception error, MessageVersion version, Message& fault) in c:\Myapplication\App_Code\Util\ElmahHttpErrorHandler.cs:line 19 
     at System.ServiceModel.Dispatcher.ErrorBehavior.ProvideFault(Exception e, FaultConverter faultConverter, ErrorHandlerFaultInfo& faultInfo) 
     at System.ServiceModel.Dispatcher.ErrorBehavior.ProvideMessageFaultCore(MessageRpc& rpc) 
     at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessageCleanup(MessageRpc& rpc) 
    InnerException: 

Web.config文件。會有什麼問題嗎？

UPDATE 注意：我正在運行WCF服務ASP.NET下。即我通過添加新網站將WCF服務項目添加到解決方案，然後選擇WCF服務模板。我目前正在IDE中運行它。在IIS上託管它也沒有幫助。

Answer 1

我回答我的問題。

我試着在我的web.config中添加以下

<system.serviceModel> 
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" /> 
</system.serviceModel> 

還裝飾我的服務具有以下屬性

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]  
public class CalculatorService : ICalculatorSession  
{ 
    // Implement calculator service methods 
} 

還是沒有用。 然後我得到了解決方案here，通過它您可以在不使用HTTPContext的情況下使用Elmah。即通過寫

Elmah.ErrorLog.GetDefault(null).Log(new Error(ex)); 

，而不是

Elmah.ErrorSignal.FromCurrentContext().Raise(error); 

Answer 2

您是否在ASP.NET內運行此代碼？ 看起來像HttpContext爲空，這導致ELmah代碼拋出異常 - 方法Elmah.ErrorSignal.FromCurrentContext（）會傳遞HttpContext.Current從我記得（已經有一段時間，因爲看着它）到Elmah.ErrorSignal .FromContext（HttpContext上下文）方法，這似乎是空的，這通常不會在Asp.Net託管的東西的情況下。

另一種可能性是，這是發生在服務器的請求外界如此的HttpContext可能爲空

Answer 3

唯一穩定的解決方案，我能找到是去除web.config文件的屬性和使用屬性他們Exception Logging for WCF Services using ELMAH

Answer 4

使用服務行爲記錄錯誤謝謝大家，這裏是我想到的ErrorHelper類，用於在網站和WCF服務，Windows服務等中手動記錄錯誤：

public static class ErrorHelper 
{ 
    /// <summary> 
    /// Manually log an exception to Elmah. This is very useful for the agents that try/catch all the errors. 
    /// 
    /// In order for this to work elmah must be setup in the web.config/app.config file 
    /// </summary> 
    /// <param name="ex"></param> 
    public static void LogErrorManually(Exception ex) 
    { 
     if (HttpContext.Current != null)//website is logging the error 
     {     
      var elmahCon = Elmah.ErrorSignal.FromCurrentContext(); 
      elmahCon.Raise(ex); 
     } 
     else//non website, probably an agent 
     {     
      var elmahCon = Elmah.ErrorLog.GetDefault(null); 
      elmahCon.Log(new Elmah.Error(ex)); 
     } 
    } 
}