Net Error Handling
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Asp.net Application_error
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 how to handle application error in global.asax in mvc 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 page level error handling in asp.net example sample 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!");
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Asp.net Mvc Error Handling
9 Documentation APIs and reference Dev centers Samples Retired content We’re asp.net custom error sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. MSDN Library
Asp.net Custom Error Page
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 https://docs.asp.net/en/latest/fundamentals/error-handling.html 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. How to: Handle Application-Level Errors Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 .NET https://msdn.microsoft.com/en-us/library/24395wz3.aspx 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 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(HttpExcep
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Dates in JSONReducing Serialized JSON SizeDeserializing Partial JSON FragmentsConditional Property SerializationSerialization using ContractResolverDebugging with Serialization TracingSerialization Error Handling Json.NET supports error handling during serialization and deserialization. Error handling lets you catch an error and choose whether to handle it and continue with serialization or let the error bubble up and be thrown in your application.Error handling is defined through two methods: the Error event on JsonSerializer and the OnErrorAttribute.Error EventThe Error event is an event handler found on JsonSerializer. The error event is raised whenever an exception is thrown while serializing or deserializing JSON. Like all settings found on JsonSerializer, it can also be set on JsonSerializerSettings and passed to the serialization methods on JsonConvert.Serialization Error HandlingCopy 1List>(@"[ 4 '2009-09-09T00:00:00Z', 5 'I am not a date and will error!', 6 [ 7 1 8 ], 9 '1977-02-20T00:00:00Z', 10 null, 11 '2000-12-01T00:00:00Z' 12 ]", 13 new JsonSerializerSettings 14 { 15 Error = delegate(object sender, ErrorEventArgs args) 16 { 17 errors.Add(args.ErrorContext.Error.Message); 18 args.ErrorContext.Handled = true; 19 }, 20 Converters = { new IsoDateTimeConverter() } 21 }); 22 23// 2009-09-09T00:00:00Z 24// 1977-02-20T00:00:00Z 25// 2000-12-01T00:00:00Z 26 27// The string was not recognized as a valid DateTime. There is a unknown word starting at index 0. 28// Unexpected token parsing date. Expected String, got StartArray. 29// Cannot convert null value to System.DateTime.In this example we are deserializing a JSON array to a collection of DateTimes. On the JsonSerializerSettings a handler has been assigned to the Error event which will log the error message and mark the error as handled.The result of deserializing the JSON is three successfully deserialized dates and three error messages: one for the badly formatted string ("I am not a date and will error!"), one for the nested JSON array, and one for the null value since the list doesn't allow nullable DateTimes. The event handler has logged these messages and Json.NET has continued on deserializing the JSON because the errors were marked as handled.One thing to note with error handling in Json.NET is that an unhandled error will bubble up and raise the