World Validation Sample App is Broken in .Net Core 3.1

bgiromini · February 8, 2020, 3:11am

When I run the most recent version of the World Validation .Net core project, clicking on any razor page causes the browser to just download the page (Brave browser, up to date). If I simply change the project to a netcore30 project, it displays the razor pages as expected. Other non-razor pages work as expected.

Edit: easy to replicate, visit http://validation.web-app.io/ and click on any link to a razor based page.

bgiromini · February 9, 2020, 4:00am

See my other post on how to solve this problem, .Net Core 3.1 on Azure App Service

mythz · February 11, 2020, 10:16am

Finally got around to upgrading it to .NET Core 3.1 by updating the default configuration to match the razor .NET Core template, the other important piece for .NET Core 3 is needing to configure a StartupActivator class:

github.com

NetCoreTemplates/razor/blob/e6b2bb82c81fc8fb07eff94e7afbdd42ded2569f/MyApp/Program.cs#L27


    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }


        public static IHostBuilder CreateWebHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder => {
                    webBuilder.UseModularStartup<Startup, StartupActivator>();
                });
    }


    public class StartupActivator : ModularStartupActivator
    {
        public StartupActivator(IConfiguration configuration) : base(configuration) { }
    }
}

Since it relies on some magic of only scanning assemblies where the Startup class is defined.