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    <p>We needed the ability to log from a console app and a windows service in addition to our ASP.NET site. I used the answer (<code>ErrorLog.GetDefault(null);</code>) which worked well until I needed to email too.</p> <p>So, here is my solution. It handles the log, email, tweet and filtering (both in the config file and in code). I have also wrapped the main call as an extension to Exception so it can be called like: <code>catch(Exception ex) { ex.LogToElmah(); }</code></p> <p>To filter in code, hook the corresponding .Filtering event: <code>ElmahExtension.ErrorLog.Filtering += new ExceptionFilterEventHandler(ErrorLog_Filtering);</code></p> <p>Code:</p> <pre><code>using System; using System.Web; using Elmah; namespace System { public static class ElmahExtension { public static void LogToElmah(this Exception ex) { if (HttpContext.Current != null) { ErrorSignal.FromCurrentContext().Raise(ex); } else { if (httpApplication == null) InitNoContext(); ErrorSignal.Get(httpApplication).Raise(ex); } } private static HttpApplication httpApplication = null; private static ErrorFilterConsole errorFilter = new ErrorFilterConsole(); public static ErrorMailModule ErrorEmail = new ErrorMailModule(); public static ErrorLogModule ErrorLog = new ErrorLogModule(); public static ErrorTweetModule ErrorTweet = new ErrorTweetModule(); private static void InitNoContext() { httpApplication = new HttpApplication(); errorFilter.Init(httpApplication); (ErrorEmail as IHttpModule).Init(httpApplication); errorFilter.HookFiltering(ErrorEmail); (ErrorLog as IHttpModule).Init(httpApplication); errorFilter.HookFiltering(ErrorLog); (ErrorTweet as IHttpModule).Init(httpApplication); errorFilter.HookFiltering(ErrorTweet); } private class ErrorFilterConsole : ErrorFilterModule { public void HookFiltering(IExceptionFiltering module) { module.Filtering += new ExceptionFilterEventHandler(base.OnErrorModuleFiltering); } } } } </code></pre> <p>In addition, you will need to add a reference to the <code>System.Web.dll</code> in your project for this to work.</p> <p><strong>EDIT</strong>: As per the comments, this code will send emails only if your config file has <code>&lt;errorMail async="false"/&gt;</code>. Refer to <a href="http://pastebin.com/L2xTT71K" rel="noreferrer">this code snippet</a> should you want to keep <code>&lt;errorMail async="true"/&gt;</code> in your config file (to be used when HttpContext.Current is available). </p>
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    1. USJason Kealey
    1. USBrian Chance
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    1. COAwesome post. This worked perfectly for me. Just had to put the normal stuff from the web.config in my app.config and smooth sailing!
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      1. USChris Kooken
    2. COThis wasn't working for me in a unit test until I set <elmah><errorMail async="false" /></elmah>. I had async previously set to true.
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      1. USTodd Smith
    3. COThanks for the post--worked great! We hooked up many events including ErrorLog_Filtering, ErrorLog_Logged, ErrorMail_Filtering, ErrorMail_Mailing, ErrorMail_Mailed, ErrorMail_DisposingMail using the appropriate classes (ExceptionFilterEventHandler, ErrorLoggedEventHandler, etc.)
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