CODEWITHSUNDEEP
asp.net-coreasp.net-core-mvc
adam3039
adam3039

Reputation: 1201

Getting blank pages for error messages with UseDeveloperExceptionPage enabled

I'm getting blank pages for both when I enter an invalid URL, or when an exception is thrown within my application. I have UseDeveloperExceptionPage() enabled, and I have confirmed that my app environment is in development mode, and that the method is firing. The app works fine, but not having error messages displaying in the browser is frustrating.

My Startup.cs Configure method:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.UseIISPlatformHandler();
            app.UseStaticFiles();
            app.UseIdentity();
            app.UseMvc(m =>
            m.MapRoute(
                    name: "default",
                    template: "{controller}/{action}/{id?}",
                    defaults: new { controller = "Home", action = "Index" }
                ));

            if(env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            CreateSampleData(app.ApplicationServices).Wait();
        }

My project.json

{
  "version": "1.0.0-*",

  "dependencies": {
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
    "EntityFramework.Commands": "7.0.0-rc1-final",
    "Microsoft.Framework.ConfigurationModel.Json": "1.0.0-beta4",
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-rc1-final",
    "Microsoft.AspNet.Authentication.Cookies": "1.0.0-rc1-final"
  },

  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel",
    "ef": "EntityFramework.Commands"
  },

  "frameworks": {
    "dnx451": { },
    "dnxcore50": { }
  },

  "exclude": [
    "wwwroot",
    "node_modules"
  ],
  "publishExclude": [
    "**.user",
    "**.vspscc"
  ]
}

Upvotes: 8

Views: 7811

Answers (1)

Stafford Williams
Stafford Williams

Reputation: 9806

The order matters - put UseMvc(..) after your exception blocks so the exception middleware can catch exceptions that the Mvc middleware throws.

If you take a look at the source for DeveloperExceptionPageMiddleware you can see that it simply calls the next middleware in the pipeline inside a try/catch.

404s however will still show a blank page, as they are not an exception. To configure something else for those, take a look at StatusCodeErrorPages.

Upvotes: 15

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