Custom ASP.NET MVC handle error attribute. Handles and logs all errors.

CustomHandleErrorAttribute.cs

  public class CustomHandleErrorAttribute : HandleErrorAttribute
  {
    private static readonly ILog _log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

    public override void OnException(ExceptionContext filterContext)
    {
      _log.Error("Internal server error occurred while handling web request.", filterContext.Exception);
      if (!filterContext.HttpContext.IsCustomErrorEnabled)
      {
        return;
      }

      if (!ExceptionType.IsInstanceOfType(filterContext.Exception))
      {
        return;
      }

      var controllerName = (string)filterContext.RouteData.Values["controller"];
      var actionName = (string)filterContext.RouteData.Values["action"];
      var model = new HandleErrorInfo(filterContext.Exception, controllerName, actionName);

      filterContext.Result = new ViewResult
      {
        ViewName = View,
        MasterName = Master,
        ViewData = new ViewDataDictionary<HandleErrorInfo>(model),
        TempData = filterContext.Controller.TempData
      };

      filterContext.ExceptionHandled = true;
      filterContext.HttpContext.Response.Clear();
      filterContext.HttpContext.Response.StatusCode = (int)HttpStatusCode.InternalServerError;

      filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;

      
    }
  }

Logging done regardless of customerrors on or off