Getting scope errors in my Startup ConfigureServices method when trying to add my PaypalSyncHostedService

Question

I've got a table of products plans and subscriptions in my application, and I have created a PaypalSyncService with methods to sync these tables with tables from the Paypal API.

  public class PaypalSyncService
    {
        private readonly EzGigDbContext _context;
        private readonly PaypalService _paypalService;

        public PaypalSyncService(EzGigDbContext context, PaypalService paypalService)
        {
            _context = context;
            _paypalService = paypalService;
        }

        public async Task Sync()
        {
            await SyncProducts();
            await SyncPlans();
            await SyncSubscriptions();
        }
// other methods
    }

I then created a PaypalHostedService to run those sync operations once an hour

   public class PaypalSyncHostedService : IHostedService, IDisposable
    {
        private readonly IServiceScopeFactory _serviceScopeFactory;
        private readonly PaypalSyncService _paypalSyncService;
        private Timer _timer;
        //private readonly ILogger<PaypalSyncHostedService> _logger;

        public PaypalSyncHostedService(PaypalSyncService paypalSyncService, IServiceScopeFactory serviceScopeFactory/*, ILogger<PaypalSyncHostedService> logger*/)
        {
            _paypalSyncService = paypalSyncService;
            _serviceScopeFactory = serviceScopeFactory;
            //_logger = logger;
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _timer = new Timer(DoSync, null, TimeSpan.Zero, TimeSpan.FromHours(1));

            return Task.CompletedTask;
        }

        private void DoSync(object state)
        {
            try
            {
                using (var scope = _serviceScopeFactory.CreateScope())
                {
                    var paypalSyncService = scope.ServiceProvider.GetRequiredService<PaypalSyncService>();
                    paypalSyncService.Sync().Wait();
                }
            }
            catch (Exception ex)
            {
                //_logger.LogError(ex, "Error occurred while syncing with Paypal");
            }
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            _timer?.Change(Timeout.Infinite, 0);
            return Task.CompletedTask;
        }

        public void Dispose()
        {
            _timer?.Dispose();
        }
    }

But when I add the PaypalHostedService to my list of services in Startup.cs (ConfigureServices)

            services.AddScoped<EzGigDbContext>();
            services.AddScoped<ShiftService>();
            services.AddScoped<PaypalService>();
            services.AddScoped<OrganisationService>();
            services.AddScoped<LoginService>();
            services.AddScoped<PaypalSyncService>();
            services.AddScoped<IHostedService, PaypalSyncHostedService>();
            services.AddScoped<SubscriptionManagementService>();
            services.AddScoped <UserService>();

I get the following error if I have my PaypalSyncHostedService as a Scoped variable in the service

System.InvalidOperationException
  HResult=0x80131509
  Message=Cannot resolve scoped service 'System.Collections.Generic.IEnumerable`1[Microsoft.Extensions.Hosting.IHostedService]' from root provider.
  Source=Microsoft.Extensions.DependencyInjection
  StackTrace:
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteValidator.ValidateResolution(Type serviceType, IServiceScope scope, IServiceScope rootScope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.Microsoft.Extensions.DependencyInjection.ServiceLookup.IServiceProviderEngineCallback.OnResolve(Type serviceType, IServiceScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider)
   at Microsoft.Extensions.Hosting.Internal.Host.<StartAsync>d__9.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.<RunAsync>d__4.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.<RunAsync>d__4.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)
   at EzGig.Program.Main(String[] args) in C:\Users\johnm\source\repos\EzGig\Program.cs:line 14

  This exception was originally thrown at this call stack:
    [External Code]
    EzGig.Program.Main(string[]) in Program.cs

and if I try to change the PaypalHostedService to a Singleton, I get the following error

System.AggregateException
  HResult=0x80131500
  Message=Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Microsoft.Extensions.Hosting.IHostedService Lifetime: Singleton ImplementationType: EzGig.Services.PaypalSyncHostedService': Cannot consume scoped service 'EzGig.Services.PaypalSyncService' from singleton 'Microsoft.Extensions.Hosting.IHostedService'.)
  Source=Microsoft.Extensions.DependencyInjection
  StackTrace:
   at Microsoft.Extensions.DependencyInjection.ServiceProvider..ctor(IEnumerable`1 serviceDescriptors, IServiceProviderEngine engine, ServiceProviderOptions options)
   at Microsoft.Extensions.DependencyInjection.ServiceCollectionContainerBuilderExtensions.BuildServiceProvider(IServiceCollection services, ServiceProviderOptions options)
   at Microsoft.Extensions.DependencyInjection.DefaultServiceProviderFactory.CreateServiceProvider(IServiceCollection containerBuilder)
   at Microsoft.Extensions.Hosting.Internal.ServiceFactoryAdapter`1.CreateServiceProvider(Object containerBuilder)
   at Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider()
   at Microsoft.Extensions.Hosting.HostBuilder.Build()
   at EzGig.Program.Main(String[] args) in C:\Users\johnm\source\repos\EzGig\Program.cs:line 14

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
InvalidOperationException: Error while validating the service descriptor 'ServiceType: Microsoft.Extensions.Hosting.IHostedService Lifetime: Singleton ImplementationType: EzGig.Services.PaypalSyncHostedService': Cannot consume scoped service 'EzGig.Services.PaypalSyncService' from singleton 'Microsoft.Extensions.Hosting.IHostedService'.

Inner Exception 2:
InvalidOperationException: Cannot consume scoped service 'EzGig.Services.PaypalSyncService' from singleton 'Microsoft.Extensions.Hosting.IHostedService'.

I've tried both services as singleton, but that also threw an error. Could anyone point me in the right direction?

Getting scope errors in my Startup ConfigureServices method when trying to add my PaypalSyncHostedService

0 Answers0