How can I pass a runtime parameter as part of the dependency resolution?

Question

I need to be able to pass a connection string into some of my service implementations. I am doing this in the constructor. The connection string is configurable by user will be

Answer 1

I know this is a bit old but thought i'd give my input since there is a easier way to do this in my opinion. This doesn't cover all the cases as shown in other posts. But this is a easy way of doing it.

public class MySingleton {
    public MySingleton(string s, int i, bool b){
        ...
    }
}

No lets create a service extention class to add easier and keep it neet

public static class ServiceCollectionExtentions
{
    public static IServiceCollection RegisterSingleton(this IServiceCollection services, string s, int i, bool b) =>
        services.AddSingleton(new MySingleton(s, i, b));
}

Now to call it from startup

services.RegisterSingleton("s", 1, true);