C# Application Error Handling
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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 c# error handling get line number takes a minute: Sign up Best Practice for Exception Handling in a Windows Forms Application? up vote 109 down vote favorite 94 I'm currently in the process of writing my first Windows Forms application. I've read a few C# books c# error handling framework now so I've got a relatively good understanding of what language features C# has to deal with exceptions. They're all quite theoretical however so what I haven't got yet is a feel for how to translate the basic concepts into a good exception-handling model in my application. Would anyone like to share any pearls of wisdom on the subject? Post any common mistakes you've seen newbies like myself make, and any general advice on handling exceptions in a way that will
C# Error Handling Techniques
my application more stable and robust. The main things I'm currently trying to work out are: When should I re-throw an exception? Should I try to have a central error-handling mechanism of some kind? Do handling exceptions which might be thrown have a performance hit compared with pre-emptively testing things like whether a file on disk exists? Should all executable code be enclosed in try-catch-finally blocks? Are there any times when an empty catch block might be acceptable? All advice gratefully received! c# winforms exception-handling share|improve this question edited Oct 13 '11 at 13:56 Otiel 9,63094491 asked Oct 8 '08 at 16:13 Jon Artus 2,390103039 add a comment| 15 Answers 15 active oldest votes up vote 73 down vote A few more bits ... You absolutely should have a centralized exception handling policy in place. This can be as simple as wrapping Main() in a try/catch, failing fast with a graceful error message to the user. This is the "last resort" exception handler. Preemptive checks are always correct if feasible, but not always perfect. For example, between the code where you check for a file's existence and the next line where you open it, the file could have been deleted or some other issue may impede your access. You still need try/catch/finally in that world. Use both the preemptive check and the try/catch/finally as appropriate. Never "swallow" an exception, except in the most well-documented cases when you are absolutely, p
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 c# error handling class APIs and reference Dev centers Retired content Samples We’re sorry. The content error handling in c# best practices you requested has been removed. You’ll be auto redirected in 1 second. MSDN Library MSDN Library MSDN Library
Error Handling C# Mvc
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 http://stackoverflow.com/questions/183589/best-practice-for-exception-handling-in-a-windows-forms-application 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 https://msdn.microsoft.com/en-us/library/bb397417.aspx 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
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 https://msdn.microsoft.com/en-us/library/system.appdomain.unhandledexception(v=vs.110).aspx centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. System AppDomain Class AppDomain Events AppDomain Events UnhandledException Event UnhandledException Event UnhandledException http://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/aspnet-error-handling Event AssemblyLoad Event AssemblyResolve Event DomainUnload Event FirstChanceException Event ProcessExit Event ReflectionOnlyAssemblyResolve Event ResourceResolve Event TypeResolve Event UnhandledException Event TOC Collapse the table of content Expand the table of content This error handling documentation is archived and is not being maintained. This documentation is archived and is not being maintained. AppDomain.UnhandledException Event .NET Framework (current version) Other Versions Visual Studio 2010 .NET Framework 4 Silverlight Visual Studio 2008 .NET Framework 3.5 .NET Framework 3.0 .NET Framework 2.0 .NET Framework 1.1 Occurs when an exception is not caught.Namespace: SystemAssembly: mscorlib (in mscorlib.dll)Syntax C#C++F#VB Copy public event UnhandledExceptionEventHandler c# error handling UnhandledException Implements_AppDomain.UnhandledExceptionRemarksThis event provides notification of uncaught exceptions. It allows the application to log information about the exception before the system default handler reports the exception to the user and terminates the application. If sufficient information about the state of the application is available, other actions may be undertaken — such as saving program data for later recovery. Caution is advised, because program data can become corrupted when exceptions are not handled.Note In the .NET Framework versions 1.0 and 1.1, application termination and debugging options are reported to the user before this event is raised, rather than after. This event can be handled in any application domain. However, the event is not necessarily raised in the application domain where the exception occurred. An exception is unhandled only if the entire stack for the thread has been unwound without finding an applicable exception handler, so the first place the event can be raised is in the application domain where the thread originated. Note In the .NET Framework versions 1.0 and 1.1, this event occurs only for the default application domain that is created by the system when an applicat
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