Asp Net Mvc 2 Custom Error Page
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you're not alone. It's surprisingly difficult to do this correctly, not helped by the fact that some errors are handled by ASP.NET and others by IIS. Ideally asp net mvc turn off custom errors (and I expect such is the case with some other frameworks/servers) we
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would just configure our custom error pages in one place and it would just work, no matter how/where the error
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was raised. Something like:
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return a 404 HTTP status code. Ideally we should return something a little friendlier to our site visitors than the error pages built in to ASP.NET/IIS, perhaps offering some advice on why the resource may not exist or providing an option to search the site. For the purposes of this blog post, my custom 404 page is very simple, but you can see some microsoft asp net mvc 2 really nice examples here.
404 Page Not Found
I created a new ASP.NET MVC 5 application using the standard template in Visual Studio. If I run the site and try to navigate to a resource that does not exist e.g. /foo/bar, I'll get the standard ASP.NET 404 page with the following information: Server Error in '/' Application. The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly. Requested URL: /foo/bar Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.33440 Not exactly friendly, is it? In this case the error was raised by ASP.NET MVC because it could not find a matching controller and/or action that matched the specified URL. In order to set up a custom 404 error page add the following to web.config insideit as part of our official documentation for implementing custom error pages, we've decided to sponsor it. Visit elmah.io - Error Management for .NET web asp net mvc turn off customerrors applications using ELMAH, powerful search, integrations with Slack and HipChat, Visual Studio mvc 4 custom error page integration, API and much more. Custom error pages and global error logging are two elementary and yet mvc 5 custom error page very confusing topics in ASP.NET MVC 5. There are numerous ways of implementing error pages in ASP.NET MVC 5 and when you search for advice you will find http://benfoster.io/blog/aspnet-mvc-custom-error-pages 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 avoid search engine indexing Global error logging for unhandled exceptions Error https://dusted.codes/demystifying-aspnet-mvc-5-error-pages-and-error-logging 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 MvcApplication : System.Web.HttpApplication Navigating to the implementation of HttpApplication will reveal the underlying IHttpHandler and IHttpAsyncHandler interfaces: public class HttpApplication : IComponent, IDisposable, IHttpAs
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Dustin ASP .NET MVC Recently, I had to implement a dynamic custom 404 error page in an ASP.NET MVC2 website. My first instinct was to turn CustomErrors mode on and setup a 404 Error, but this failed to return my custom error page in a shared hosting environment and instead displayed the default IIS 404 page. I'll walk you through fixing this in just a minute, but for now I want to show you how to create the custom 404 page. Creating the View The first step in setting up a dynamiccustom 404 is to create your view. In my case I just added a new View to the project called 404 which created 404.aspx in my root directory (I did not add it to the Views folder, but you can if you'd like). I kept the 404 page outside of the default Views folder as it wasn't part of my essential application. My 404 View used my public site Master Page which has a dynamic menu. Creating the Controller The next step in setting up the custom 404 page was creating a controller to handle it. My site uses many custom routes, including one for {category}/{urlSlug} so I loaded the View based on the file path and executed this controller when needed for the other pages. In my case I will never have any static pages so my {category}/{urlSlug} route will catch everything that is not specifically mapped to other sections (such as my Admin area). For my 404, I just used my HomeController and added a PageNotFound method. The PageNotFound method is extremely simple. It is responsible only for setting the StatusCode of the response to 404 and returning the 404.aspx page that I created: [HttpGet] public ViewResult PageNotFound() { Response.StatusCode = 404; return View("~/404.aspx"); } Mapping the 404 Route In my case I can have any number of dynamic routes based on a supplied category and urlSlug (remember my {category}/{urlSl