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POLogging errors in ASP.NET MVC
 

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    <p>I'm currently using log4net in my ASP.NET MVC application to log exceptions. The way I'm doing this is by having all my controllers inherit from a BaseController class. In the BaseController's OnActionExecuting event, I log any exceptions that may have occurred:</p> <pre><code>protected override void OnActionExecuted(ActionExecutedContext filterContext) { // Log any exceptions ILog log = LogManager.GetLogger(filterContext.Controller.GetType()); if (filterContext.Exception != null) { log.Error("Unhandled exception: " + filterContext.Exception.Message + ". Stack trace: " + filterContext.Exception.StackTrace, filterContext.Exception); } } </code></pre> <p>This works great if an unhandled exception occurred during a controller action.</p> <p>As for 404 errors, I have a custom error set up in my web.config like so:</p> <pre><code>&lt;customErrors mode="On"&gt; &lt;error statusCode="404" redirect="~/page-not-found"/&gt; &lt;/customErrors&gt; </code></pre> <p>And in the controller action that handles the "page-not-found" url, I log the original url being requested:</p> <pre><code>[AcceptVerbs(HttpVerbs.Get)] public ActionResult PageNotFound() { log.Warn("404 page not found - " + Utils.SafeString(Request.QueryString["aspxerrorpath"])); return View(); } </code></pre> <p>And this also works.</p> <p>The problem that I'm having is how to log errors that are on the .aspx pages themselves. Let's say I have a compilation error on one of the pages or some inline code that will throw an exception:</p> <pre><code>&lt;% ThisIsNotAValidFunction(); %&gt; &lt;% throw new Exception("help!"); %&gt; </code></pre> <p>It appears that the HandleError attribute is correctly rerouting this to my Error.aspx page in the Shared folder, but it is definitely not being caught by my BaseController's OnActionExecuted method. I was thinking I could maybe put the logging code on the Error.aspx page itself, but I'm unsure of how to retrieve the error information at that level.</p>
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