//ServiceProvider is used to get service instance(s)
// MyServiceProvider implements IServiceProvider
ServiceProvider.Current = MyServiceProvider;

//ServiceCollection handles adding services to be provided
//It also controls how they will be configured (Singleton vs Transient)
//Singleton = All Get calls will return the same service instance
//Transient = Every Get call will return a newly created instance of the service
//MyServiceCollection implements IServiceCollection
ServiceCollection.Current = MyServiceCollection;

//This will configure a specific instance which already has been created
ServiceCollection.Current.AddSingleton(serviceInstance.GetType(),serviceInstance);

//You can also configure a service to be served when requesting a parent type
ServiceCollection.Current.AddSingleton(typeof(ParentClass),childClassServiceInstance);

//You can also configure a function that will be used to construct the singleton service on demand
ServiceCollection.Current.AddSingleton((provider)=> new MyService());

//Transient services require a factory because a new instance is created every time
ServiceCollection.Current.AddTransient<ServiceType>((provider) => new ServiceType());

//Adding a transient service with a parent type
ServiceCollection.Current.AddTransient<ParentType,ServiceType>((provider) => (ParentType)new ServiceType());

//Get a particular service
var service = ServiceProvider.Get<ServiceType>();

//If more than one service of the given type is provided we can get them all
var services = ServiceProvider.GetAll<ServiceType>();