Realizing this, Microsoft made configuration a first-order concept in .NET Core and did so in quite a flexible, extensible way. It all starts with a builder instance; we add providers to it, and when we've finished, we just ask it to build a configuration object that will hold all the values loaded from each provider in memory.
This configuration object will be capable of returning configuration settings from any of the added providers transparently, which means that regardless of the source, we use the same syntax for querying configuration options. It will hold an in-memory representation of all the values loaded from all registered providers, and will allow you to change them, or add new entries.
The base class model for the configuration application programming interface (API) in .NET Core looks like this:
So, the provider mechanism is split into two base interfaces and their implementations...
