.NET Core DI: Cannot consume scoped service from singleton

Question

I have a class like this

public class KReport : IReport
{
    private readonly EDevContext _context;
    private readonly IMapper _mapper;
  
    public KReport(EDevContext context, IMapper mapper = null)
    {
        _context = context;
        _mapper = mapper;
     
    }
    public void GetKReport(int reportId,int page=1)
    {
        string s;
       //some logic here
       if(reportId==1){
             GetKReport(452,2)
       }
    }
}

Also in startup I have added a singleton service

services.AddSingleton<IKReport, KReport>();

But when I execute the application I am getting this error

System.AggregateException: 'Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: common.IKReport Lifetime: Singleton ImplementationType: common.KReport': Cannot consume scoped service 'Models.EPMO_DevContext' from singleton 'common.IKnReport'.)'

This error wont occur when that recursive call gets commented

Really sorry my understanding of this dependency injection or singleton services are almost 0. So I didnt understand what happens here

Answer 1

You must add EDevContext service before services.AddSingleton<IKReport, KReport>();

---

Edit: From the trace stack, that show your class EDevContext is addScopeService,you need make the EDevContext and KReport as the same lifetimes

Answer 2

It is because you are injecting scoped service in KReport.

Use following code in "Startup.cs" file.

services.AddScoped<IkReport,KReport>();