Asp Net Error Trapping
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Guidance for Hosting Providers Security Performance Migration API Contribute ASP.NET Docs » Fundamentals » Error Handling exception handling in asp.net c# Edit on GitHub Warning This page documents version 1.0.0-rc1 and has not yet been updated for version 1.0.0 Error Handling¶ By Steve Smith When errors occur http://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/aspnet-error-handling in your ASP.NET app, you can handle them in a variety of ways, as described in this article. Sections Configuring an Exception Handling Page Using the Developer Exception Page Configuring Status Code Pages Limitations of Exception Handling During Client-Server Interaction Server Exception Handling Startup Exception Handling ASP.NET MVC Error Handling View or download sample https://docs.asp.net/en/latest/fundamentals/error-handling.html code Configuring an Exception Handling Page¶ You configure the pipeline for each request in the Startup class's Configure() method (learn more about Application Startup). You can add a simple exception page, meant only for use during development, very easily. All that's required is to add a dependency on Microsoft.AspNetCore.Diagnostics to the project and then add one line to Configure() in Startup.cs: public void Configure(IApplicationBuilder app, IHostingEnvironment env) { app.UseIISPlatformHandler(); if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } The above code includes a check to ensure the environment is development before adding the call to UseDeveloperExceptionPage. This is a good practice, since you typically do not want to share detailed exception information about your application publicly while it is in production. Learn more about configuring environments. The sample application includes a simple mechanism for creating an exception: public static void HomePage(IApplicationBuilder app) { app.Run(async (context) => { if (context.Request.Query.ContainsKey("throw")) { throw new Exception("Exception triggered!"); } var
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 https://msdn.microsoft.com/en-us/library/ed577840.aspx you requested has been removed. You’ll be auto redirected in 1 second. MSDN Library https://msdn.microsoft.com/en-us/library/aa478986.aspx 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 asp net being maintained. This documentation is archived and is not being maintained. How to: Handle Page-Level Errors Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 .NET Framework 3.0 Visual Studio 2005 If possible, you should handle errors in Try/Catch blocks within your code, because a problem is more easily corrected where it occurs. If the user can help correct a problem, the page needs to return to the same asp net handler place so the user has a context for understanding what to do. A page-level handler returns you to the page, but there is no longer anything on the page because instances of controls are not created. To provide the user any information, you must specifically write it to the page. You would probably use a page-level error handler to log unhandled errors or to take the user to a page that can display helpful information. This code example shows a handler for the Error event in an ASP.NET Web page. This handler catches all exceptions that are not already handled within Try/Catch blocks in the page. After you handle an error, you must clear it by calling the ClearError method of the Server object (HttpServerUtility class). Example This handler filters for specific kinds of exceptions. For an ArgumentOutOfRangeException exception, the handler writes some text on the page, provides a link back to the page, logs the error, and notifies system administrators. For an InvalidOperationException exception, the handler simply transfers the exception to the Generic Error Page. For any other kind of exception, the handler does nothing, which allows your site to automatically redirect to the generic page specified in the Web.config file. Your own code would filter for exceptions that are
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. Articles and Overviews Web Applications (ASP.NET) JSP Migration Articles JSP Migration Articles HTTP Error Trapping HTTP Error Trapping HTTP Error Trapping ADO.NET for the Java Programmer ASP.NET Best Practices Authentication Configuration Cookies Deployment Directives Downloading and Uploading Files HTTP Error Trapping Java Servlets Multi-Browser Support Session Management Tag Libraries Tracing and Debugging Validation ViewState and JavaBeans Web Services Integration XML Processing 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. HTTP Error Trapping Microsoft Corporation October 2003 Applies to Microsoft® ASP.NET Microsoft Visual Basic® .NET Java Server Pages Summary: Learn how error trapping works in Java and ASP.NET, and how to convert error trapping routines using the Java Language Conversion assistant. (9 printed pages) Contents Introduction Errors in Java JCLA Conversion of Error Handling Error Trapping in ASP.NET Conclusion Introduction Most applications—Web-based or otherwise—use some kind of error trapping to handle both expected and unexpected errors. Error handling in Web applications occurs on four different levels, each of which generally traps different types of errors. Code-block level. Error handling done within a page in try-catch-finally blocks. Both JSP and Microsoft® ASP.NET support this structure. Page level. Errors that occur on a JSP or ASP.NET page (for example, compilation errors) are generally processed by specialized error pages. Redirection to error pages is accomplished through page directives. Application level. These errors apply to entire Web applications, and are generally handled and controlled by settings within configuration files, such as deployment descriptors in JSP applications or the web.config file in ASP.NET. Server level. This applies to all applications running on a server, and is generally configurable in the settings for the particular server. Error handling of this nature is vendor-specific. When an error occurs, it moves through these levels in a process called error bubbling. If an error can't be