Simple way to auto-register interfaces to their implementations with asp.net core default dependency injection.
Install-Package SharpDiAutoRegister
In your ConfigureServices method in Startup.cs, just use some regex to match the interfaces you want to register and you are done. SharpDiAutoRegister will scan the Assemblies you provided and register the first class it finds that implements that interface.
Ex:
services.ForInterfacesMatching("^I[a-zA-z]+Repository$")
.OfAssemblies(Assembly.GetExecutingAssembly())
.AddSingletons();
services.ForInterfacesMatching("^IRepository")
.OfAssemblies(Assembly.GetExecutingAssembly())
.AddTransients();
//and so on...SharpDiAutoRegister will not override a pre-registered interface, so if you want a custom behavior for some of them, just register them before calling SharpDiAutoRegister methods.
Happy coding!