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Efrain Mejias C
Asked: 2022-03-09 14:12:48 +0800 CST 2022-03-09 14:12:48 +0800 CST

How to create and implement a scoped service in Asp.Net Core?

  • 772

I am creating a scheduled task with Quartz.Net in Asp.Net Core 5.0, I had already done it in later versions and all is well with this example from the following link:

https://andrewlock.net/creating-a-quartz-net-hosted-service-with-asp-net-core/

But now it gives me the following error the moment the task is invoked:

Cannot resolve 'IntegracionDocu.Commons.QuartzDescargaProgramada' from root provider because it requires scoped service 'Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]'.

(“I understand that I must create a scoped service for the singleton to consume”) I DON'T KNOW HOW TO DO IT??

I found this that should go in the QuartzDownloadScheduled class but I don't know where theIScopedService

 public Task Execute(IJobExecutionContext context)
    {
        // Create a new scope
        using(var scope = _provider.CreateScope())
        {
            // Resolve the Scoped service
            var service = scope.ServiceProvider.GetService<IScopedService>();
            _logger.LogInformation("Ejecutandose!");
        }

        return Task.CompletedTask;
    }
}

My code

Startup.cs

  public void ConfigureServices(IServiceCollection services)
        {
            // Agregamos servicio  Quartz
            services.AddSingleton<IJobFactory, SingletonJobFactory>();
            services.AddSingleton<ISchedulerFactory, StdSchedulerFactory>();
            // Agregamos nuestro trabajo programado
            services.AddSingleton<QuartzDescargaProgramada>();
            services.AddSingleton(new JobSchedule(jobType: typeof(QuartzDescargaProgramada), cronExpression: "0 54 22 ? * *"));
            services.AddHostedService<QuartzHostedService>();
         
        }
asp.net-core

1 Answers

  1. Best Answer

    That is only if you want to use some other Scoped service within the Job.

    In this case, you don't mention which Scoped service you want to use, also, you don't have any Scoped registered, so I don't think it's necessary in your case.

    Instead of IScopedService, the interface or implementation of the Scoped service that you are going to use within your Job should go.

    An example would be if you had a Scoped service ValueService:

    public void ConfigureServices(IServiceCollection services)
{
   ...
   services.AddScoped<ValueService>(); // Registro de ValueService
}

    and you would like to use it in your Job:

    public Task Execute(IJobExecutionContext context)
{
   // Create a new scope
   using(var scope = _provider.CreateScope())
   {
      // Resolve the Scoped service
      var service = scope.ServiceProvider.GetService<ValueService>();
      _logger.LogInformation("Ejecutandose!");
   }

   return Task.CompletedTask;
}
    • 2