<PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.0" />

SettingsProvider

public abstract class SettingsProvider : ProviderBase
Acts as a base class for deriving custom settings providers in the application settings architecture.
using System.Configuration.Provider; namespace System.Configuration { public abstract class SettingsProvider : ProviderBase { public abstract string ApplicationName { get; set; } public abstract SettingsPropertyValueCollection GetPropertyValues(SettingsContext context, SettingsPropertyCollection collection); public abstract void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection collection); } }