Is not work for CreateApplicationBuilder

[AndresGMD]

Hi.

Currently I'm using var builder = Host.CreateApplicationBuilder(args); in my initial configuration to work with Workerservice

This is my Appfactory for testing

public class WorkerAppFactory : WorkerApplicationFactory<Program>
{
    private IHost host;
    protected override void ConfigureHost(IHostBuilder builder)
    {
        var configuration = TestFixtures.GetContigurationTest(TestFixtures.Settings!);

        builder.UseEnvironment("Local");
        builder.ConfigureAppConfiguration((context, config) =>
            {
                // Add test configuration
                config.AddConfiguration(configuration);
            });
        builder.ConfigureServices(services =>
        {
            services.AddTestMongoDb();
        });
    }

Bu when I exceuted using StarAsync I get the following Error:

System.AggregateException : One or more errors occurred. (Method 'CreateHostBuilder' was not found in class 'Program' (Assembly: TripArc.Excursion.Api, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null))
---- System.Exception : Method 'CreateHostBuilder' was not found in class 'Program' (Assembly: TripArc.Excursion.Api, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at TripArc.Excursion.Api.Unit.Tests.BackgroundServiceTest.UpdateMetatronDescriptionWorkerTest..ctor(WorkerAppFactory workerFactory) in C:\Users\AndrésGustavoMUÑOZ\Projects\Trip-Arc\DMX\TripArc.Excursions.Api\TripArc.Excursion.Api.Unit.Tests\BackgroundServiceTest\UpdateMetatronDescriptionWorkerTest.cs:line 34
at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span1 copyOfArgs, BindingFlags invokeAttr) ----- Inner Stack Trace ----- at WorkerService.Testing.HostFactoryResolver.ResolveFactory[T](Assembly assembly, String name) at WorkerService.Testing.HostFactoryResolver.ResolveHostBuilderFactory(Assembly assembly) at WorkerService.Testing.WorkerApplicationFactory1.CreateHostBuilder()

How can I use with

var builder = Host.CreateApplicationBuilder(args); ?

[gao-artur]

The WorkerApplicationFactory, similar to the older WebApplicationFactory, expects your entry point class to have a CreateHostBuilder method by convention. So, your Program.cs should look similar to this:

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

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureServices(services =>
            {
                services.AddHostedService<Worker>();
            });
}

If you are using the newer VS templates, it probably looks like this

public class Program
{
    public static void Main(string[] args)
    {
        IHost host = Host.CreateDefaultBuilder(args)
            .ConfigureServices(services =>
            {
                services.AddHostedService<Worker>();
            })
            .Build();

        host.Run();
    }
}

Sorry, I haven't updated this code since .NET Core 3, so it won't work with newer templates. Maybe try this solution instead (I didn't try it)