I have been looking at a number of tutorials and SO questions (such as https://stackoverflow.com/questions/48778144/app-settings-net-core) regarding reading appsettings.json in .Net Core 3 and I cannot find any pointers on how-to when dealing with the Worker service. There is no Startup method. Instead, I have a Program.cs with the main method:

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =&gt;
            Host.CreateDefaultBuilder(args)
                .ConfigureServices((hostContext, services) =&gt;
                {
                    services.AddHostedService&lt;Worker&gt;();
                });
    }

How do I go about reading from the appsettings.json file in a Worker Service Project in .Net Core 3?

I have added a reference to a custom WCF client I created with .Net v4.8 and another project that has just all the Busines Domain Object shared between the whole solution. My solution is primarily .Net v4.8 and I want to use the Worker Service. The Client project creates a WCF Client internally by code so all binding and endpoints are configurable. If this were a .Net v4.8 project, I&#39;d add the following to the app.config:

    &lt;appSettings&gt;
        ...
        &lt;add key=&quot;AminServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/AminService.svc&quot; /&gt;
        &lt;add key=&quot;BillServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/BillService.svc&quot; /&gt;
        &lt;add key=&quot;CustomerServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/CustomerService.svc&quot; /&gt;
        &lt;add key=&quot;EpayServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/EpayService.svc&quot; /&gt;
        &lt;add key=&quot;FinanceServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/FinanceService.svc&quot; /&gt;
        &lt;add key=&quot;GrpServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/GrpService.svc&quot; /&gt;
        &lt;add key=&quot;MetaServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/MetaService.svc&quot; /&gt;
        &lt;add key=&quot;ReportServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/ReportService.svc&quot; /&gt;
        &lt;add key=&quot;ServiceInfoServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/ServiceInfoService.svc&quot; /&gt;
        &lt;add key=&quot;UsersServiceUri&quot; value=&quot;http://localhost:45108/ServiceHost/v1/UsersService.svc&quot; /&gt;
        ...
        &lt;add key=&quot;ExcessiveLogging&quot; value=&quot;false&quot; /&gt;
        ...
    &lt;/appSettings&gt;

Now I need these settings to be in the new JSON format and read them in.

**Edit**

This is a fresh project. The worker is not doing anything:

    public class Worker : BackgroundService
    {
        private readonly ILogger&lt;Worker&gt; logger;

        public Worker(ILogger&lt;Worker&gt; logger)
        {
            this.logger = logger;
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!stoppingToken.IsCancellationRequested)
            {
                logger.LogInformation(&quot;Worker running at: {time}&quot;, DateTimeOffset.Now);
                await Task.Delay(5000, stoppingToken);
            }
        }
    }

And here is how I get this project type:

[![Worker Service][1]][1]


  [1]: https://i.stack.imgur.com/TFQAN.png

All .Net Core-Configuration Solutions on Gang of Coders

Total of 1 .Net Core-Configuration Solutions

How to setup app settings in a .Net Core 3 Worker Service