Global Error Handling Asp.net Mvc
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it as part of our official documentation for implementing custom error pages, we've decided to sponsor it. Visit elmah.io - Error Management mvc error handling best practice for .NET web applications using ELMAH, powerful search, integrations with
Asp.net Mvc Handleerrorattribute
Slack and HipChat, Visual Studio integration, API and much more. Custom error pages and global error
Mvc Error Logging
logging are two elementary and yet very confusing topics in ASP.NET MVC 5. There are numerous ways of implementing error pages in ASP.NET MVC 5 and
Mvc Application_error
when you search for advice you will find a dozen different StackOverflow threads, each suggesting a different implementation. Overview What is the goal? Typically good error handling consists of: Human friendly error pages Custom error page per error code (e.g.: 404, 403, 500, etc.) Preserving the HTTP error code in the response to exception handling in mvc 4 razor avoid search engine indexing Global error logging for unhandled exceptions Error pages and logging in ASP.NET MVC 5 There are many ways of implementing error handling in ASP.NET MVC 5. Usually you will find solutions which involve at least one or a combination of these methods: HandleErrorAttribute Controller.OnException Method Application_Error event customErrors element in web.config httpErrors element in web.config Custom HttpModule All these methods have a historical reason and a justifyable use case. There is no golden solution which works for every application. It is good to know the differences in order to better understand which one is applied best. Before going through each method in more detail I would like to explain some basic fundamentals which will hopefully help in understanding the topic a lot easier. ASP.NET MVC Fundamentals The MVC framework is only a HttpHandler plugged into the ASP.NET pipeline. The easiest way to illustrate this is by opening the Global.asax.cs: public class MvcAppl
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About mvc error page Us Learn more about Stack Overflow the company Business Learn more about hiring mvc exception filter developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the onexception mvc 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 minute: Sign up ASP.NET MVC 5 error handling up https://dusted.codes/demystifying-aspnet-mvc-5-error-pages-and-error-logging vote 13 down vote favorite 4 We want to handle 403 errors, 404 errors, all errors due to a MySpecialDomainException and provide a default error page for all other errors (including errors in the IIS configuration!). All errors should return proper Razor views, it would be very nice to have an ErrorController in front of the views. E.g. something like this: public class ErrorController : Controller { http://stackoverflow.com/questions/21993758/asp-net-mvc-5-error-handling public ViewResult NotFound () { return View(); } public ViewResult Forbidden () { return View(); } public ViewResult Default () { var ex = ObtainExceptionFromSomewhere(); if(ex is MySpecialDomainException) return View("MySpecialDomainException", new ErrorModel { Exception = ex }); return View("GeneralError", new ErrorModel { Exception = ex }); } } Currently you find many different ways to do that on the www, some most probably outdated. Among those: Controller.OnException() Error filter customErrors element in web.config Handling in Global.asax's Application_Error Q1: What is the recommended way to fulfill our requirements with ASP.NET MVC 5? Also we want to catch errors occurring in the IIS host. Q2: To prevent that IIS has to handle any 404s we thought about adding a default route matching all possible URLs - is this recommendable? Better to register instead for IIS' 404s as well? Q3: Is it even possible to register an IIS error page which goes back to a controller, or is IIS capable of ASPX / static HTML only? c# asp.net-mvc error-handling asp.net-mvc-5 asp.net-mvc-5.1 share|improve this question edited Jul 26 at 6:09 Mukesh Ram 2,7853625 asked Feb 24 '14 at 16:46 D.R. 6,19072272 I'm curious.. How exactly would you propose to
Working with Multiple Environments Hosting Managing Application State Servers Request Features Open Web Interface for .NET (OWIN) Choosing the Right .NET For You on the Server MVC https://docs.asp.net/en/latest/fundamentals/error-handling.html Testing Working with Data Client-Side Development Mobile Publishing and Deployment Guidance http://blog.ploeh.dk/2009/12/01/GlobalErrorHandlinginASP.NETMVC/ for Hosting Providers Security Performance Migration API Contribute ASP.NET Docs » Fundamentals » Error Handling 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 in your mvc error 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 code Configuring global error handling 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 builder = new StringBuilder(); builder.AppendLine("
Hedreaded Yellow Screen of Death. The most prominently described technique involves attributing either you Controller or a single Controller action, like we see in the AccountController created by the Visual Studio project template.[HandleError] public class AccountController : Controller { } That sure is easy, but I don't like it for a number of reasons: Even though you can derive from HandleErrorAttribute, it's impossible to inject any dependencies into Attributes because they must be fully constructed at compile-time. That makes it really difficult to log errors to an interface. It violates the DRY principle. Although it can be applied at the Controller level, I still must remember to attribute all of my Controllers with the HandleErrorAttribute. Another approach is to override Controller.OnException. That solves the DI problem, but not the DRY problem. Attentive readers may now point out that I can define a base Controller that implements the proper error handling, and require that all my Controllers derive from this base Controller, but that doesn't satisfy me: First of all, it still violates the DRY principle. Whether I have to remember to apply a [HandleError] attribute or derive from a : MyBaseController amounts to the same thing. I (and all my team members) have to remember this always. It's unnecessary project friction. The second thing that bugs me about this approach is that I really do favor composition over inheritance. Error handling is a cross-cutting concern, so why should all my Controllers have to derive from a base controller to enable this? That is absurd. Fortunately, ASP.NET MVC offers a third way. The key lies in the Controller base class and how it deals with IExceptionFilters (which HandleErrorAttribute implements). When a Controller action is invoked, this actually happens through an IActionInvoker. The default ControllerActionInvoker is responsible for gathering the list of IExceptionFilters, so the first thing we can do is to derive from that and override its GetFilters method:public class ErrorHandlingActionInvoker : ControllerActionInvoker { private readonly IExceptionFilter filter; public ErrorH