Incompatible with Microsoft.Extensions.Hosting?

[628426]

The new ASP.NET 3.1 Core Web Application templates use the following code in Program.cs

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

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }

When using this code WebVella can't be run as there is a NullReferenceException in WebVella.Erp.Jobs.ErpJobScheduleService line 11 trying to call ProcessScheduleAsync on ScheduleManager.Current

            ScheduleManager.Current.ProcessSchedulesAsync(stoppingToken);

To fix this replace the code in Program.cs to use Microsoft.AspNetCore.Hosting as follows:

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

		public static IWebHost BuildWebHost(string[] args) =>
		   WebHost.CreateDefaultBuilder(args)
			   .UseStartup<Startup>()
			   .Build();
	}

It looks like some sort of timing issue perhaps Startup.ConfigureServices isn't given time to complete before Startup.Configure is called because its run Lazily

[rumen-yankov]

The problem is that background services start before Startup.Configure even called. So I changed ErpJobScheduleService and ErpJobProcessService to delay processing until ScheduleManager and JobManager singletons are initialized. ( nuget is not yet updated with that change)

[628426]

The problem is that background services start before Startup.Configure even called. So I changed ErpJobScheduleService and ErpJobProcessService to delay processing until ScheduleManager and JobManager singletons are initialized.

Thanks that is a good fix and will work for me