ICar
{
    string Drive();
}

public class BMW
{
    public string Drive(){...};
}

public class Jaguar
{
    public string Drive(){...};
}

public void ConfigureServices(IServiceCollection services)
{
     // Add framework services.
     services.AddMvc();
     services.AddTransient<ICar, BMW>();
     // or
     services.AddTransient<ICar, Jaguar>();
 }