Keith Hill Keith Hill - 4 months ago 21
ASP.NET (C#) Question

Can ASP.NET 5 app.UseErrorHandler() access error details?

In my MVC4 app I had a global.asax.cs override of

Application_Error(object sender, EventArgs e)
where I could extract the
exception
,
statusCode
and
requestedUrl
(for handling 404). That would get sent to my controller and the error page would be different for 404s vs 5xx (these get a stack trace). I don't see how to get this same info to my Error action using
UseErrorHandler()
. Am I using the right approach in ASP.NET 5?

Answer

Aug. 02th 2016 - Update for 1.0.0

Startup.cs

using Microsoft.AspNet.Builder;

namespace NS
{
    public class Startup
    {
         ...
         public virtual void Configure(IApplicationBuilder app)
         {
             ...
             app.UseExceptionHandler("/Home/Error");
             ...
         }
     }
}

HomeController.cs

using Microsoft.AspNet.Diagnostics;
using Microsoft.AspNet.Http.Features;
using Microsoft.AspNet.Mvc;
using Microsoft.Extensions.Logging;

namespace NS.Controllers
{
    public class HomeController : Controller
    {
        static ILogger _logger;
        public HomeController(ILoggerFactory factory)
        {
            if (_logger == null)
                _logger = factory.Create("Unhandled Error");
        }

        public IActionResult Error()
        {
            var feature = HttpContext.Features.Get<IExceptionHandlerFeature>();
            var error = feature?.Error;
            _logger.LogError("Oops!", error);
            return View("~/Views/Shared/Error.cshtml", error);
        }
    }
}

project.json

...
"dependencies": {
    "Microsoft.AspNet.Diagnostics": "1.0.0",
     ...
}
...
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