Asp.net Error Handling Logging
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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 asp.net error logging 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
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. asp.net error page The content you requested has been removed. You’ll be auto redirected in 1 second. asp.net custom error MSDN Library MSDN Library MSDN Library MSDN Library Design Tools Development Tools and Languages Mobile and Embedded Development .NET Development Office asp.net mvc error handling 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 https://msdn.microsoft.com/en-us/library/bb397417.aspx archived and is not being maintained. This documentation is archived and is not being maintained. How to: Handle Application-Level Errors Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 .NET Framework 3.0 Visual Studio 2005 This code example shows how to create an error handler in the Global.asax file that will catch all unhandled ASP.NET errors while processing a request — in other words, all the errors that https://msdn.microsoft.com/en-us/library/24395wz3.aspx are not caught with a Try/Catch block or in a page-level error handler. In the example, the handler transfers control to a generic error page named GenericErrorPage.aspx, which interprets the error and displays an appropriate message. Example The following example is from a complete code sample in Complete Example for Error Handlers. Security Note Never set customErrors to Off in your Web.config file if you do not have an Application_Error handler in your Global.asax file. Potentially compromising information about your Web site can be exposed to anyone who can cause an error to occur on your site. C#VB Copy void Application_Error(object sender, EventArgs e) { // Code that runs when an unhandled error occurs // Get the exception object. Exception exc = Server.GetLastError(); // Handle HTTP errors if (exc.GetType() == typeof(HttpException)) { // The Complete Error Handling Example generates // some errors using URLs with "NoCatch" in them; // ignore these here to simulate what would happen // if a global.asax handler were not implemented. if (exc.Message.Contains("NoCatch") || exc.Message.Contains("maxUrlLength")) return; //Redirect HTTP errors to HttpError page Server.Transfer("HttpErrorPage.aspx"); } // For other kinds of errors give the user some information // but stay on the default page Response.Write("
Global Page Error
\n"); Response.Write( "" + exc.Message + "
\n"); Response.Write("RetuBy Joe Lowrance said, er tweeted, it best when he said, "the amount of attention ELMAH hasn't got is shocking." ELMAH is one of those largely unknown and deeply awesome .NET Open Source projects that should be http://www.hanselman.com/blog/ELMAHErrorLoggingModulesAndHandlersForASPNETAndMVCToo.aspx part of ASP.NET proper. What is ELMAH? I like to say that ELMAH is Tivo for your ASP.NET Errors. You can get your Yellow Screens of Death, with full call-stack back and analyze what's really happening. It's Exception Driven Development. What's it really do? Once ELMAH has been dropped into a running web application and configured appropriately, you get the following facilites without changing a single line of your code: Logging asp.net error of nearly all unhandled exceptions. A web page to remotely view the entire log of recoded exceptions. A web page to remotely view the full details of any one logged exception. In many cases, you can review the original yellow screen of death that ASP.NET generated for a given exception, even with customErrors mode turned off. An e-mail notification of each error at the time it occurs. An RSS feed asp.net error handling of the last 15 errors from the log. A number of backing storage implementations for the log, including in-memory, Microsoft SQL Server and several contributed by the community. Created by Atif Aziz (@raboof on Twitter) and Scott Mitchell, ELMAH means is "Error Logging Modules and Handlers" and has been rocking my world since, well, September of 2004. (Small Correction, Scott Mitchell helped writing the original MSDN article. ELMAH is 100% conceived of by Atif.) From the project site: ELMAH (Error Logging Modules and Handlers) is an application-wide error logging facility that is completely pluggable. It can be dynamically added to a running ASP.NET web application, or even all ASP.NET web applications on a machine, without any need for re-compilation or re-deployment. ELMAH is wonderful for many reasons. First, because it just works. Second, because it's a fantastic example of effective use of HttpModules and HttpHandlers working together. Third, because it's been design with enough thought that nearly anything you'd want from it for use in a production site is there. I'm sitting here in a cafe and I'm going to add ELMAH to the ASP.NET MVC-based NerdDinner.com Source Code. Actually, the site, as I don't need to recompile the source if I'm not doing anything tricky. ;) Implementing ELMAH on you