ELMAH – 不具有HttpContext的exceptionlogging
我试着用Elmah.XmlFileErrorLog 这个解决scheme，但我得到以下exception
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
<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>
我正在使用Windows 7.可以有任何相关的问题吗？
更新注意：我在ASP.NET下运行WCF服务。 即我已经添加WCF服务项目解决scheme通过添加新网站，然后selectWCF服务模板。 我目前正在IDE中运行它。 托pipe它在IIS上也没有帮助。
我正在回答我自己的问题。
我试图在我的web.config中添加以下内容
<system.serviceModel> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" /> </system.serviceModel>
也用以下属性来装饰我的服务
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)] public class CalculatorService : ICalculatorSession { // Implement calculator service methods }
仍然没有用。 然后我得到了解决scheme， 在这里你可以使用没有HTTPContext的Elmah。 即通过写入来logging错误
Elmah.ErrorLog.GetDefault(null).Log(new Error(ex));
代替
Elmah.ErrorSignal.FromCurrentContext().Raise(error);
谢谢大家，这里是我想到的ErrorHelper类来手动logging网站和WCF服务，Windows服务等错误：
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)); } } }
我能find的唯一稳定解决scheme是删除web.config属性，并使用它们在exceptionlogging中使用的服务行为属性来使用ELMAH进行WCF服务
你在ASP.NET中运行这个代码吗？ 看起来像HttpContext为null，这导致ELmah代码抛出exception – 方法Elmah.ErrorSignal.FromCurrentContext（）将从我记得（已经有一段时间，因为看了它）传递给Elmah.ErrorSignal的HttpContext.Current。 FromContext（HttpContext上下文）方法，这似乎是空的，这通常不会在Asp.Net托pipe的东西的情况下。
另一种可能性是，这是发生在对服务器的请求之外，所以HttpContext可能为空
