I am trying using DI add in my startup class Singleton. I would like to based on processorStringName which comes from appSettings and Factory class add proper processor? Is it possible to do this in a nice way?
IProcessor processor = ProcessorFactory.CreateProcessor(Configuration, processorStringName);
services.AddSingleton<IProcessor, processor>();
services.AddSingleton<IProcessor, processor>();
This won't work because processor is a variable name, not a type-name.
Please review the overloads for AddSingleton.
You want this instead:
services.AddSingleton<IProcessor>( implementationInstance: processor );
Or this:
services.AddSingleton<IProcessor>( implementationFactory: sp => processor );