cannot consume a scoped service from singleton

Question

I am getting the above error and I realize why, but the odd behavior I see that it only happens in our Dev environment and not in for example our staging or Production environment and it is the exact same code. In the startup there is :

services.AddSingleton<ExcahngeService>();
services.AddScoped<ITradingService, TradingService>();

This throws the error: "cannot consume a scoped service from singleton"

Could this be due to a timing issue, where the environment is slower ?

Answer 1

Scoped instance lifetime is limited, It is only available per request. So you are consuming an instance from Scoped service into Singleton and the error throws because of the scoped service is disposed. Either make both Singleton or Scoped

Answer 2

As Microsoft best practice you should create new scope and get scoped service from ServiceProvider https://learn.microsoft.com/en-us/dotnet/core/extensions/scoped-service