I have a very basic asp.net MVC 6 app with basic routing, and I have a custom ErrorController to route errors to certain views.
I am expecting however that when the user types in an URL that does not exist, an exception is thrown (and I can handle it). However, no exception is thrown when I type in some random URL, I just get a blank page. I'm pretty sure this worked in similarly in MVC < 6.
The error handling itself works fine if I just throw an exception in a controller.
Startup.cs (partially)
public void Configure(IApplicationEnvironment appEnv, IApplicationBuilder app, IHostingEnvironment env) { if (env.IsDevelopment()) { app.UseBrowserLink(); app.UseDeveloperExceptionPage(); } else { app.UseExceptionHandler(HandleException); } app.UseStaticFiles(); app.UseMvc(routes => MapRoutes(routes, appEnv)); } private static void MapRoutes(IRouteBuilder routes, IApplicationEnvironment env) { routes.MapRoute( name: "default", template: "{controller}/{action}/{id?}", defaults: new { controller = "main", action = "index" }); } private static void HandleException(IApplicationBuilder errorApp) { #pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously errorApp.Run(async context => HandleErrorContext(context)); #pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously } private static void HandleErrorContext(HttpContext context) { var error = context.Features.Get<IExceptionHandlerFeature>(); var exception = error.Error; if (exception == null) { context.Response.Redirect("../error/external"); } else if (exception is ExpirationException) { context.Response.Redirect("../error/expired"); } else if (exception is HttpException) { var httpException = exception as HttpException; int code = httpException.GetHttpCode(); context.Response.Redirect("../error/external?code=" + code); } else { context.Response.Redirect("../error/external"); } } 2 Answers
Answers 1
Not a direct answer to my question, but I've got the workaround from http://stackoverflow.com/a/4833519/2713516 working. I'm still wondering why asp.net is not throwing a 404 though.
routes.MapRoute( "PageNotFound", "{*catchall}", new { controller = "Home", action = "PageNotFound" } ); Answers 2
You can show user-friendly error pages by adding the StatusCodePages middleware to the pipeine. In Startup.cs
public void Configure(IApplicationEnvironment appEnv, IApplicationBuilder app, IHostingEnvironment env) { if (env.IsDevelopment()) { app.UseBrowserLink(); app.UseDeveloperExceptionPage(); } else { app.UseExceptionHandler("/error/500"); app.UseStatusCodePagesWithReExecute("/error/{0}"); } app.UseStaticFiles(); app.UseMvc(routes => MapRoutes(routes, appEnv)); } The response body should be generated by re-executing the path /error/{0}.
[Route("[controller]")] public class ErrorController : Controller { [HttpGet("{statusCode}")] public IActionResult Error(int statusCode) { //switch (statusCode) //{ // return different views... //} Response.StatusCode = statusCode; return View("Error", statusCode); } } Thats how you can show a 404 error page or any other error page.
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