Error Handling In Asp.net Global.asax
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. MSDN Library MSDN Library MSDN Library MSDN Library Design Tools Development Tools and Languages Mobile and Embedded Development .NET Development Office development Online Services Open Specifications patterns & practices Servers and Enterprise Development Speech Technologies Web Development Windows Desktop App Development TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Complete Example for Error Handlers Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 This code example includes elements for both page-level and application-level exception handling. Code Example Files The example consists of the following files: Web.config Global.asax Default.aspx ExceptionUtility (to be put in the App_Code folder) GenericErrorPage.aspx HttpErrorPage.aspx Http404ErrorPage.aspx DefaultRedirectErrorPage.aspx Web.config The following example shows the Web.config file. The customErrors section specifies how to handle errors that occur with file types that are mapped to ASP.NET, such as .aspx, .asmx, and .ashx files. (In IIS 6.0 and in IIS 7.0 in classic mode, static content files such as .html and .jpg files are not mapped to ASP.NET.) The settings in the example customErrors section cause any unhandled HTTP 404 (file not found) errors to be directed to the Http404ErrorPage.aspx file. These HTTP 404 errors would occur if a request were made for an .aspx file, .asmx file, and so on and if the requested file did not exist. All other unhandled errors in ASP.NET files are directed to the DefaultRedirectErrorPage.aspx file. If static content files are not handled by ASP.NET, a request for a nonexistent .html or .jpg file does not cause a redirect to the Http404ErrorPage.aspx file. If you want ASP.NET to handle requests for all file types, you can configure IIS to map file-name extensions to ASP.NET. Note In the example, the mode attribute is set to "On" so that you can error messages when you run the example in Visual Studio. In a production environment, this setting wo
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies http://stackoverflow.com/questions/10061837/catching-errors-in-global-asax of this site About Us Learn more about Stack Overflow the company http://odetocode.com/articles/69.aspx Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a error handling minute: Sign up Catching errors in Global.asax up vote 8 down vote favorite 2 I have the following in my Global.aspx which is meant for handling errors: void Application_Error(object sender, EventArgs e) { Exception exception = Server.GetLastError(); if (exception != null) { //Log if (HttpContext.Current.Server != null) { HttpContext.Current.Server.Transfer("/siteerror.aspx"); } } } This works for the most part, but sometimes does not error handling in get into Server.Transfer. For some reason HttpContext.Current.Server is null. I figured out where this happens: when errors occur in a user control and in my business logic classes. Am I missing something here? Thanks c# asp.net error-handling share|improve this question edited Apr 8 '12 at 11:43 svick 124k23196308 asked Apr 8 '12 at 9:36 Peuge 71511330 2 Any reason not using Response.Redirect rather? –leppie Apr 8 '12 at 9:41 1 Where in global.asax is this? –Marc Gravell♦ Apr 8 '12 at 9:42 @leppie I did not add this so not entirely sure why the previous person chose Server.Transfer, it shouldn't make a difference though should it? –Peuge Apr 8 '12 at 9:53 @MarcGravell I have updated the question to reflect this. –Peuge Apr 8 '12 at 9:54 Earlier you use Server.blah - does Server.Transfer(...) not work? (no HttpContext.Current) –Marc Gravell♦ Apr 8 '12 at 9:56 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote Application_Error block can catch exception anytime between application life cycle. Application life cycle is parent of
This article demonstrates a generic error handler in the global.asax which will be implemented for anyapplication error generated by the web application for whicha custom error handler has not been written. There are three parts to this error handling routine1.It writes the error message to the event log2.It sends the development team an email with the error details3.It has a ‘pretty’ message on the web page, letting the user know that an error occurred and that the development team has been notified. We are going to use the Application_Error event of the global.asax file. The HttpApplication class in the System.Web namespace implements this Error event handler, so make sure to add a reference to this namespace. We also need to add a reference to the System.Diagnosistics namespace --- protected void Application_Error(Object sender, EventArgs e) { // declare an exeception object and get the original exception Exception exception = Server.GetLastError().GetBaseException(); // now we are going to be nice to ourselves and format that stack trace. // It would be easy tojust do a string stackTrace = exception.StackTrace, but after// you’ve tried to read a fewof these spending time formatting it – is time well spent string stackEntryDelimiter = " at "; string topStackEntry = String.Empty; string stackTrace = exception.StackTrace; try { int nextStackEntry = stackTrace.IndexOf(stackEntryDelimiter, stackEntryDelimiter.Length); if(nextStackEntry > 0) { topStackEntry = stackTrace.Substring(0, nextStackEntry); } else { topStackEntry = stackTrace; } } catch(Exception ex) { // if for whatever reason our error handler decides to generate an error – well we just eat it Debug.Write(ex.Message); } try {string eventLogFormat = "Error in {0} User: {1} Error Message: {2} Line: {3}";string[] eventLogArgs = { Request.Url.ToString(), Context.User.Identity.Name, exception.Message, topStackEntry }; string eventLogMessage = String.Format(eventLogFormat, eventLogArgs); EventLog objLog = new EventLog(); objLog.Source = "appname"; // change this to the application name for which you’re trapping errors objLog.WriteEntry(eventLogMessage, EventLogEntryType.Error); // write to the event log } catch(Exception ex) { // just eat it Debug.Write(ex.Message); } try { // Again we want to format our error message in the email string mailFormat = "" + "Error at: {0}
" + "User: {1}
" + "Error Message: {2}
" + "Stack Trace
{