<PackageReference Include="System.Configuration.ConfigurationManager" Version="9.0.0-preview.2.24128.5" />

IApplicationSettingsProvider

public interface IApplicationSettingsProvider
Defines extended capabilities for client-based application settings providers.
SettingsPropertyValue GetPreviousVersion(SettingsContext context, SettingsProperty property)

Returns the value of the specified settings property for the previous version of the same application.

void Reset(SettingsContext context)

Resets the application settings associated with the specified application to their default values.

void Upgrade(SettingsContext context, SettingsPropertyCollection properties)

Indicates to the provider that the application has been upgraded. This offers the provider an opportunity to upgrade its stored settings as appropriate.