<PackageReference Include="System.Configuration.ConfigurationManager" Version="11.0.0-preview.3.26207.106" />

System.Configuration.ProtectedConfigurationProviderCollection

public class ProtectedConfigurationProviderCollection : ProviderCollection
Provides a collection of ProtectedConfigurationProvider objects.
public ProtectedConfigurationProvider this[string name] { get; }

Gets a ProtectedConfigurationProvider object in the collection with the specified name.

public ProtectedConfigurationProviderCollection()

Initializes a new instance of the ProtectedConfigurationProviderCollection class using default settings.