C# - Elmah: Exceptions Without HttpContext?
Jan 21, 2010
I spawn a thread on Application_Start and would like to log exceptions. There is not Context/HttpContext/HttpContext.Current, so how might i get it to log?ATM it does not catch any exception in my threads and if i write ErrorSignal.FromCurrentContext().Raise(ex); i get an error about context cannot be null.Maybe i can create a dummy HttpContext but somehow i dont think that will work well.-edit- i tried ErrorSignal.Get(new HttpApplication()).Raise(ex); and it doesnt seem to pick up that exception.
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Similar Messages:
Aug 3, 2010
There used to be an article at ELMAHs docs site that contained this information, but it seems to have been removed. I think it's as simple as setting a configuration setting in the section, but I haven't a clue what it isCan anyone take a few seconds and drop the configuration setting here?
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Feb 1, 2010
Is there a way to globally handle exceptions in regular ASP.NET Web Service (asmx) using ELMAH like we do it in ASP.NET web site ?
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Jan 26, 2010
I'm building the standard 3-tier ASP.NET web application but I'm struggling as to where to do certain things - specifically handling exceptions.
I've tried to have a look around on the web for some examples but can't find any which go as far as a whole project showing how everything links together.
In my data-tier I'm connecting to SQL Server and doing some stuff. I know I need to catch exceptions that could be raised as a result but I'm not sure where to do it.
From what I've read I should be doing it in the UI tier but in that case I'm not sure how to ensure that the connection to the database is closed. Is anyone able to clarify how to do this? Also if anyone knows as to where I could find an example 3-tier web application that follows best practices that would be great too.
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Dec 9, 2010
We have a asp.net application and want to implement logging. The first idea was to use the Application_Error method in the global.asax file.
The problem is that ASP.NET very often seem to throw exceptions internally that are not caused by the application and which seem not to interfer with the users normal workflow. For example we often get HTTPExceptions, UnauthorizedAccessExceptions and others caught in this method, although there is no real error in the application.
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Apr 9, 2010
We're migrating an application to use IIS7 integrated mode. In library code that is designed to work either within the context of an HTTP request or not, we commonly have code like this:
if (HttpContext.Current != null &&
HttpContext.Current.Request != null) {
// do something with HttpContext.Current.Request
} else {
// do equivalent thing without HttpContext..
}
But in IIS7 integrated mode the check for HttpContext.Current.Request throws an exception whenever this code is called from Application_Start.
protected void Application_Start(object sender, EventArgs e)
{
SomeLibrary.DoSomethingWithHttpContextCurrentDetection();
}
Results in:
System.Web.HttpException: Request is not available in this context
How can I detect whether the request is really available without wrapping these calls in an exception handler and taking action based on whether an exception is generated or not.
Looking at HttpContext in Reflector I see it has an internal bool HideRequestResponse field but it's internal so I can only get to it with reflection and that's fragile. Is there a more official/approved way to determine if it's ok to call HttpContext.Request?
This blog post about the subject says not to use HttpContext, but how, in generic library code, can you determine if it's ok to use HttpContext?
http://mvolo.com/blogs/serverside/archive/2007/11/10/Integrated-mode-Request-is-not-available-in-this-context-in-Application_5F00_Start.aspx
I'm using the work-around mentioned there which is to use Application_BeginRequest and an initialized field to only initialize once as part of BeginRequest, but that has to be done in every calling application whereas I'd prefer to make the library code more robust and handle this situation regardless of where it's called from.
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Nov 23, 2010
I have been experimenting with code that will clear all of the cookies in an HttpContext.Response.Initially, I used this:
DateTime cookieExpires = DateTime.Now.AddDays(-1);
for (int i = 0; i < HttpContext.Request.Cookies.Count; i++)
{
HttpContext.Response.Cookies.Add(
new HttpCookie(HttpContext.Request.Cookies[i].Name, null) { Expires = cookieExpires });
}
this will error with an OutOfMemoryException because the for loop never exits - each time you add a cookie to the Response, it also gets added to the `Request.
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Nov 23, 2010
i'm using an example in which i can fake the session.It's for use in a unittest of a mvc controller.In the test i create a controller and then i do this:
FakeHttpContext httpctx = new FakeHttpContext(null,null,null,null,mSessionItems );
ControllerContext ctx2 = new ControllerContext(httpctx,new RouteData(), target);
here mSessionItems is my session and target is my instance of a controller,and indeed, when i'm in a controller reading this.ControllerContext.HttpContext.Session, i have a session, great!but.... i also read the session outside the controller, and there i use HttpContext.Current.Session, and that is null (or actualy, the HttpContext.Current is null).
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Jan 24, 2011
I'm following this blog post about setting up ELMAH with MVC: [URL] I've only done part 1. Everything works correctly if I simply go to the Home controller, and then cause an error. I can view /elmah.axd as well, and my errors are logging in the database correctly.
However, I've added an area to my application named Admin. If I navigate to /Admin, I receive the following error:
System.MissingMethodException: No parameterless constructor defined for this object.
public override IController CreateController(RequestContext requestContext, string controllerName)
{
var controller = base.CreateController(requestContext, controllerName); //Error here
var c = controller as Controller;
I'm assuming this has something to do with my Area.
EDIT for jfar:
For instance, I have an Employees controller in my Admin area:
public class EmployeesController : Controller
{
private IEmployeesRepository employeesRepository;
public EmployeesController(IEmployeesRepository employeesRepository)
{
this.employeesRepository = employeesRepository;
}
//...
}
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May 21, 2010
I am trying to setup elmah for asp.net 1.1 application.i have following entry in my web.config
<httpHandlers>
<add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
</httpHandlers>
[code]...
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Feb 24, 2010
I have ELMAH setup on my production server and it has done a fantastic job of letting me know about any niggles - as well as any creative SQL injection!I've decided to introduce URl Rewriting and went for http://www.urlrewriting.net/ in the end. It was nice and easy to setup and it's doing exactly what I want with the customer-facing site.The problem is ELMAH. Because I've set the urlrewritingnet node in my config like so:
<urlrewritingnet
rewriteOnlyVirtualUrls="true"
contextItemsPrefix="QueryString"
[code]...
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May 7, 2010
I'm interested in using ELMAH but need to configure it programmatically. We have existing infrastructure for determining connection strings and the like, and can't code them into Web.Config.How do I go about using ELMAH in this case?
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Jun 22, 2010
I'd like to configure ELMAH for an ASP.NET MVC site entirely in code. This includes registering the module, setting the logging provider and settings, and filtering exceptions.The only part I've managed to do so far is filter exceptions. Has anyone else figured out how to do this? I'd really like to avoid cluttering up my config file with settings that won't ever change.
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Dec 1, 2010
I am using Elmah in one of our production deployments and would like to secure the module to the local network only and not expose it to the public. I am aware of the remote logging option that can be turned off and also asp.net authorization, however I am interested to know if there is any support in Elmah's configuration to bind to a secondary NIC/network card which only faces the internal network ?
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Mar 5, 2010
I'm using ELMAH to handle the exceptions in my ASP.Net MVC project. I would like to use it to log errors like database connection timeout, query connection timeout and others. Is this possible with ELMAH?
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Jun 10, 2010
I've just starting looking at a site in place at work. They're using Elmah to log errors.It seems to be logging fine, but in the web interface, when I tell Elmah to show me 100 errors per page, it only shows the most recent 15.Then when I click on "Download Log" I only get shown 15 errors in the CSV.Anyone know how I can configure it to keep all the errors?Or can someone point me to some docs on how to do this?
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Jan 31, 2010
How can I determine programmatically whether or not ELMAH is enabled?
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Feb 3, 2011
I'm using the suggestion from this question: How to get ELMAH to work with ASP.NET MVC [HandleError] attribute?I used Aziz's second code sample.I ran the debugger to see what happens when an error occurs. The main function in the HandleErrorAttribute class is:
public override void OnException(ExceptionContext context)
{
base.OnException(context);
[code]...
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Apr 14, 2010
So, have an ASP 3.5 site built using ELMAH.
It runs fine under IIS 5.1, I can see all the error pages, etc.
Set up the site on another machine running IIS 7.5.
Now when I go to my /admin/elmah.axd page, i see a 404 error from IIS 7.5.
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Feb 21, 2010
I was going to use ELMAH for our ultimate automatic error logging but recently realized that ASP.NET Health Monitoring does a same work (perhaps). Now I want to know (please) if they are alternatives of each other just like log4net and entlib?
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Mar 2, 2010
I'm using Elmah with ASP.NET and wondering how I would add custom data, such as a session variable, to an unhandled exception email.I've tried several handlers in the Global.asax file but can't seem to find the right one.
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Feb 23, 2010
This question builds on the following question:How to get Elmah working with ASP.NET and IIS 5.1 URL RoutingThe solution suggested there worked, as long as elmah.axd is off of the root of the site. What if you want to secure the site as blogged here:Securely Implement ELMAH For Plug And Play Error Logging?Moving elmah.axd to /admin/elmah.axd breaks the Fix IIS 5x Wildcard Mapping Module.My workaround was just to secure "elmah.axd" instead of "admin," like:
<location path="elmah.axd">
<system.web>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
</location>
Although this works, I feel that there's got to be a more elegant solution.
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Jan 21, 2010
I want to write this
<elmah>
<errorlog type="Elmah.XmlFilerErrorLog, Elmah" logPath="~/App_Data" />
</elmah>
or
<elmah>
<errorLog type="Elmah.SQLiteErrorLog, Elmah" logPath="~/App_Data" />
</elmah>
however every place i tried putting this tag in i get an Unrecognized configuration section elmah. error. I found this question [URL] however i tried that (solution at the bottom of the question) and still get the error. Where do i put this? i found the issue. I didnt set <sectionGroup name="elmah"> properly. I couldnt find it online then remembered the demo had sqlite logging and i checked the demo config for clues.
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Aug 2, 2010
OK, apparently related questions dont seem to address this directly. An exception reaches Elmah, maybe a repository cant reach a database, but then neither can Elmah reach that database. Even if they target different servers, maybe its a network problem.
Is there a way to configure fallback logs for Elmah for cases like this, e.g. a text file, message queue, email, sms, etc? If so, where do I start looking to do this, excpt for now the Elmah source code.
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Feb 18, 2011
i have a problem where i have an exception being thrown that i am capturing in global asax. As part of this exception handling i redirect the user to a specific page because of this exception.
i also have ELMAH error handling with the email module plugged in. I do not want to receive emails for this exception. I also don't want to add this type of exception to ELMAHs ignore list, in case i want to do granular work around the exception (ie, only if it matches certain properties, happens on certain pages)
i want to:
write an Application_OnError that redirects a user to a page (i know how to do this part, more for procedure i've left it here) In the Application_OnError stop ELMAH fromrecieving this error after i've caught it
i am currently calling Server.ClearError() inside my App_OnError method, but am still receiving these emails....
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