Asp Net Mvc 4 Global Error Handler
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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 for .NET web applications using ELMAH,
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powerful search, integrations with Slack and HipChat, Visual Studio integration, API and asp net mvc 4 tutorial codeproject much more. Custom error pages and global error logging are two elementary and yet very confusing topics in asp net mvc 4 call web api from controller 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 a dozen different StackOverflow threads,
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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 pages and logging in ASP.NET MVC 5 There
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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, IHttpAsyncHandler, IHttpHandler ASP.NET itself is a larger framework to process incoming requests. Even though it could ha
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Security Performance Migration API Contribute ASP.NET Docs » Fundamentals » Error Handling Edit on GitHub Warning This asp net mvc 4 interview questions and answers for experienced 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 ASP.NET app, you can handle https://dusted.codes/demystifying-aspnet-mvc-5-error-pages-and-error-logging 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 an Exception Handling Page¶ You configure the pipeline https://docs.asp.net/en/latest/fundamentals/error-handling.html 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("
Hello World!"); builder.AppendLine("- "); builder.AppendLine("
- Throw Exception"); builder.AppendLine("
- Missing Page"); builder.AppendLine(""); builder.AppendLine(""); context.Response.ContentType = "text/html"; await con
dreaded Yellow Screen of Death. The most prominently described technique involves attributing either you Controller http://blog.ploeh.dk/2009/12/01/GlobalErrorHandlinginASP.NETMVC/ 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 asp net 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 asp net mvc 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