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ELMAH - Exception Logging without having HttpContext

Answer 1

A:

Are you running this code within ASP.NET? Seems like the HttpContext is null and this is causing the ELmah code to throw the exception -the method Elmah.ErrorSignal.FromCurrentContext() would pass HttpContext.Current from what I remember (been awhile since looked into it) to the Elmah.ErrorSignal.FromContext(HttpContext context) method and this seems to be null, which would not normally be the case in Asp.Net hosted stuff.

Another possibility is that this is occuring outside a request to the server so the HttpContext might be null

saret 2010-06-08 13:42:25

I'm running WCF service as unders ASP.NET. i.e. I've added WCF Service project to solution by Add New Website and then selecting WCF Service template. I'm currently running it from within IDE. Can it resolve if I host it on IIS?

Ismail 2010-06-09 05:15:35

I'm running it on IIS and having the same problem

Stephen lacy 2010-08-10 13:06:22

Answer 2

+1 A:

I'm answering my own question.

I tried adding following in my web.config

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

Also decorated my Service with following attribute

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

Still no use. Then I got the solution here by which you can use Elmah without HTTPContext. i.e. log errors by writing

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

instead of

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

Ismail 2010-06-28 13:00:05

I had the same problem, the problem is due to the Application Instance being null in a WCF project.I wonder if you were to run the services in a web application project template would you encounter the same problems.

Stephen lacy 2010-08-10 13:05:37

So you mean that the problem was that I was using it as website project instead of web application project?

Ismail 2010-08-11 05:01:30

No I was suggesting that the problem might be to do with the WCF Template, I was wrong though

Stephen lacy 2010-08-12 15:27:53

Answer 3

+1 A:

The only stable solution I could find is to remove the web.config attribute and use the service behavior attribute they use in http://stackoverflow.com/questions/895901/exception-logging-for-wcf-services-using-elmah

Stephen lacy 2010-08-10 14:13:01

+1 Thanks for the effort you took in order to solve a question already marked answer on a temporary solution.

Ismail 2010-08-11 05:06:50

I was having the same problem myself so no worries

Stephen lacy 2010-08-12 15:26:42

That said you hardly get much information from the HTTP Request itself that you need when debugging a WCF service so I'm not sure it's worth the effort.

Stephen lacy 2010-08-12 15:29:40

Yeah! That's true.

Ismail 2010-08-13 03:53:50

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ELMAH - Exception Logging without having HttpContext

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